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, Chapter: 17 -Problem: 69 >> Does the ozone pollution from automobiles help alleviate the ozone hole over the South Pole? Defend your answer.
Answer Preview: Ozone is a fairly reaction molecule Close to the Earths sur…

, Chapter: 14 -Problem: 61 >> Each night you measure your height just before going to bed. When you arise each morning, you measure your height again and consistently find that you are 1 inch taller than you were the night before, but only as tall as you were 24 hours ago! Is what happens to your body in this instance best described as a physical change or a chemical change? Be sure to try this activity if you haven’t already.
Answer Preview: That this process is so reversible suggests a physical change As yo…

, Chapter: 21 -Problem: 68 >> At what type of plate boundary were the Appalachian Mountains produced?
Answer Preview: Convergent boundary The Appalachia…

, Chapter: 2 -Problem: 27 >> Identify the force that propels a rocket into space.
Answer Preview: The force that prop…

, Chapter: 26 -Problem: 61 >> What is the cause of winds on Mars (and also on nearly every other planet)?
Answer Preview: Unequal heat…

, Chapter: 26 -Problem: 20 >> Why doesn’t the Moon have an atmosphere?
Answer Preview: Its gravitatio…

, Chapter: 7 -Problem: 120 >> Why can you drink a cup of boiling-hot tea atop a high mountain without any danger of burning your lips? What if you did this in a mine shaft below sea level?
Answer Preview: At high altitude the boiling poi…

, Chapter: 24 -Problem: 9 >> Why is a barrier island’s lagoon usually a quiet environment?
Answer Preview: Barrier islands form where ridges of sand break the sur…

, Chapter: 17 -Problem: 54 >> Which has more atoms: 17.031 grams of ammonia, NH3, or 72.922 grams of hydrogen chloride, HCl?
Answer Preview: The hav…

, Chapter: 14 -Problem: 69 >> Oxygen atoms are used to make water molecules. Does this mean that oxygen, O2, and water, H2O, have similar properties? Why do we drown when we breathe in water, despite all the oxygen atoms present in this material?
Answer Preview: All the oxygen water present is bound to hydrogen atoms making water molecules Water …

, Chapter: 21 -Problem: 25 >> Distinguish between anticlines and synclines.
Answer Preview: An anticline folds upward like an arch The rocks in the core of …

, Chapter: 3 -Problem: 43 >> Show that the kinetic energy of a 1.0-kg book tossed across the room at a speed of 3.0 m/s is 4.5 J. (1 J is equivalent to 1 kg(m/s)2.)
Answer Preview: KE mv 1 …

, Chapter: 26 -Problem: 72 >> Why are many craters evident on the surface of the Moon but not on the surface of Earth?
Answer Preview: Erosion hasnt occurred on th…

, Chapter: 26 -Problem: 28 >> What is the Oort cloud, and what is it noted for?
Answer Preview: The Oort cloud is …

, Chapter: 8 -Problem: 42 >> Two point charges are separated by 4 cm. The attractive force between them is 20 N. Show that when they are separated by 8 cm, the force between them is 5 N. (Why can you solve this problem without knowing the magnitudes of the charges?)
Answer Preview: By the inverse square law twice …

, Chapter: 24 -Problem: 24 >> What does the Coriolis force do to winds? To ocean currents?
Answer Preview: It defl…

, Chapter: 16 -Problem: 46 >> Which of these boxes best represents a solution?
Answer Preview: Box a shows o…

, Chapter: 14 -Problem: 23 >> How many atoms are there in one molecule of H3PO4? How many atoms of each element are there in one molecule of H3PO4?
Answer Preview: The total number of a…

, Chapter: 22 -Problem: 5 >> Compare and contrast the unsaturated zone with the saturated zone.
Answer Preview: Unsaturated zone x where pore spaces are par…

, Chapter: 3 -Problem: 48 >> Show that nearly 786 W of power is expended when a 500-N barbell is lifted 2.2 m above the floor in 1.4 s. Transcribed Image Text: useful energy output total energy input Efficiency
Answer Preview: W Fd 5…

, Chapter: 8 -Problem: 100 >> Why is a bird perched on a high-voltage wire safe, even though the wires are not insulated?
Answer Preview: As long as both of the birds feet are o…

, Chapter: 23 -Problem: 38 >> Our Earth has experienced several episodes of glaciation. Going from the most recent episode of glaciation to the oldest episode, rank these time periods: (a) late Precambrian, (b) Pleistocene, (c) early Permian, (d) Ordovician.
Answer Preview: b…

, Chapter: 16 -Problem: 40 >> Mixtures can be separated into their components by taking advantage of differences in the chemical properties of the components. Why might this separation method be less convenient than taking advantage of differences in the physical properties of the components?
Answer Preview: The chemical property involves a chemical change Through a chemical change the mat…

, Chapter: 14 -Problem: 31 >> What are the two main approaches to building nanoscale materials and devices?
Answer Preview: The top down approach in which n…

, Chapter: 21 -Problem: 56 >> Where and what is the most likely source of the energy that generates Earth’s magnetic field?
Answer Preview: Earths magnetic field is believed to be generated …

, Chapter: 2 -Problem: 109 >> A couple of your friends say that before a falling body reaches terminal velocity, it gains speed while acceleration decreases. Do you agree or disagree with your friends? Defend your answer.
Answer Preview: Agree with your friends Although acce…

, Chapter: 8 -Problem: 73 >> If you scuff electrons from your shoes while walking across a silk rug, are you negatively or positively charged?
Answer Preview: You have a la…

, Chapter: 23 -Problem: 31 >> Refer to the accompanying figure. Using the principles of relative dating, determine the relative ages of the rock bodies and other lettered features. Start with this question: What was there first?
Answer Preview: From oldest …

, Chapter: 17 -Problem: 3 >> Why is it important that a chemical equation be balanced?
Answer Preview: A chemical equation must be balanced bec…

, Chapter: 14 -Problem: 36 >> This activity is for those with access to a gas stove. Place a large pot of cool water on top of the stove, and set the burner on high. What product from the combustion of the natural gas do you see condensing on the outside of the pot? Where did it come from? Would more or less of this product form if the pot contained ice water? Where does this product go as the pot gets warmer? What physical an
Answer Preview: Water vapor condenses into water droplets on the outside of the pot This water vapor is a …

, Chapter: 18 -Problem: 42 >> Show that the pH of a solution is -0.301 when its hydronium ion concentration equals 2 moles/L. Is the solution acidic or basic?
Answer Preview: Use a calculator to find t…

, Chapter: 3 -Problem: 34 >> Place a small rubber ball on top of a basketball or soccer ball, and then drop them together. If vertical alignment remains as they fall to the floor, you’ll see that the small ball bounces unusually high. Can you reconcile this with energy conservation?
Answer Preview: When the larger ball hits the g…

, Chapter: 26 -Problem: 99 >> What are the chances that microbial life forms might one day be found elsewhere in our solar system? How much effort should we exert in searching for such life forms? And what precautions should we take upon making such a discovery?
Answer Preview: There are places in our solar system other than Earth where the conditions are favorable …

, Chapter: 10 -Problem: 19 >> Why do troops “break step” when crossing a bridge?
Answer Preview: Troops break step in order to …

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, Chapter: 17 -Problem: 76 >> What role does entropy play in chemical reactions?
Answer Preview: The entropy change determines whether or not the chemical reaction is favorable If ther…

, Chapter: 14 -Problem: 29 >> Why are common names often used for chemical compounds instead of systematic names?
Answer Preview: Common nam…

, Chapter: 28 -Problem: 57 >> If gravity is not a force, then what is it?
Answer Preview: Mass has the ef…

, Chapter: 3 -Problem: 26 >> What is the efficiency of a machine that miraculously converts all the input energy to useful output energy?
Answer Preview: Effi…

, Chapter: 7 -Problem: 116 >> What is the source of energy that keeps the dunking bird in Figure 7.28 operating? Figure 7.28 Transcribed Image Text: a b d
Answer Preview: The energy that keeps the dunking bird in operation comes …

, Chapter: 23 -Problem: 39 >> Throughout geologic time there have been several episodes of species extinction. Rank the following from most devastating to least devastating: (a) Ordovician, (b) Permian, (c) Cretaceous, (d) Pleistocene.
Answer Preview: b…

, Chapter: 16 -Problem: 61 >> Hydrogen chloride, HCl, is a gas at room temperature. Would you expect this material to be very soluble or not very soluble in water?
Answer Preview: Although oxygen gas O 2 has poor solubility in water there are many other exam…

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, Chapter: 22 -Problem: 2 >> As water is precipitated onto the land, where does it go? Where does most of the water on land end up?
Answer Preview: Water drains to streams rivers and then back to the ocean O…

, Chapter: 2 -Problem: 42 >> Madison pushes with a 160-N horizontal force on a 20-kg crate of coffee resting on a warehouse floor. The force of friction on the crate is 80 N. Show that the acceleration is 4.0 m/s2.
Answer Preview: F net m …

, Chapter: 26 -Problem: 89 >> Is the sailboat seen in the illustration sailing at a location closer to the North Pole or closer to the Equator? How can you tell?  Transcribed Image Text: A B
Answer Preview: The sailboat shown in the i…

, Chapter: 10 -Problem: 34 >> Do the activity suggested in Figure 10.24 with a stereo sound system. Simply reverse the wire inputs to one of the speakers so that the two are out of phase. When monaural sound is played and the speakers are brought face to face, the lowering of volume is truly amazing! If the speakers are well insulated, you hear almost no sound at all. Figure 10.24
Answer Preview: This is on…

, Chapter: 23 -Problem: 52 >> Suppose you see a sequence of sedimentary rock layers covered by a basalt flow. A fault displaces the bedding of the sedimentary rock but does not cut into the basalt. Relate the fault to the ages of the two rock types in the formation.
Answer Preview: The fault is older than the basalt and yo…

, Chapter: 17 -Problem: 8 >> If you had 1 mole of marbles, how many marbles would you have? How about 2 moles?
Answer Preview: One mole of marbles i…

, Chapter: 14 -Problem: 46 >> Is chemistry the study of submicroscopic, microscopic, or macroscopic matter, or of all three? Defend your answer.
Answer Preview: Chemistry is the careful study …

, Chapter: 21 -Problem: 89 >> If you found folded beds of sedimentary rock in the field, what detail would you need to know in order to tell whether the fold was an anticline or a syncline?
Answer Preview: You would need to know the ages of the different rock layers If the …

, Chapter: 5 -Problem: 50 >> Suppose that you balance a 2-kg ball on the tip of your finger, which has an area of 1 cm2. Show that the pressure on your finger is 20 N/cm2, which is 200 kPa.
Answer Preview: A 2 kg ball …

, Chapter: 3 -Problem: 18 >> If a moving car speeds up until it is going three times as fast as it was, how much kinetic energy does it have compared with its initial kinetic energy?
Answer Preview: It has …

, Chapter: 27 -Problem: 66 >> Why do low-mass stars live longer than high-mass stars?
Answer Preview: The force due to gravity is not so great in a low mass star, which means …

, Chapter: 7 -Problem: 65 >> What is the purpose of the copper or aluminum layer on the bottom of a stainless-steel pot?
Answer Preview: Copper and aluminum are b…

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, Chapter: 17 -Problem: 60 >> Which has the greater mass, 1.204 × 1024 molecules of molecular hydrogen or 1.204 × 1024 molecules of water?
Answer Preview: The water has the greater mass just as a bunch of golf balls has more mass than th…

, Chapter: 14 -Problem: 52 >> A cotton ball is dipped in alcohol and wiped across a tabletop. Explain what happens to the alcohol molecules deposited on the tabletop. Is this a physical or chemical change?
Answer Preview: The molecules of …

, Chapter: 21 -Problem: 28 >> What happens to rock when stress exceeds a rock’s elastic limit?
Answer Preview: Rocks are an elastic material x they can return to their …

, Chapter: 7 -Problem: 34 >> Hold the bottom end of a test tube full of cold water in your hand. Heat the top part in a flame until the water boils. That you can still hold the bottom shows that water (as well as glass) is a poor conductor of heat. This is even more dramatic when you wedge chunks of ice with steel wool at the bottom; then the water above can be brought to a boil without melting the ice! Try it and see.
Answer Preview: This activity …

, Chapter: 2 -Problem: 48 >> For 3.0 s, Allison exerts a net force of 10.0 N on a 6.7-kg shopping cart that was initially at rest. Find the acceleration of the cart, and show that it moves a distance of 6.7 m.
Answer Preview: a F net m 10 …

, Chapter: 26 -Problem: 63 >> If Venus were somehow transported into the habitable zone, would conditions once again become favorable for life?
Answer Preview: No, because …

, Chapter: 7 -Problem: 87 >> You can determine wind direction by wetting your finger and holding it up in the air. Explain.
Answer Preview: When a wet finger is held t…

, Chapter: 23 -Problem: 74 >> What can cause a rise in sea level? Is this likely to happen in the future? Why or why not?
Answer Preview: Melting of land based polar ice caps The break up of a super…

, Chapter: 17 -Problem: 66 >> Why does a glowing splint of wood burn only slowly in air, but burst into flames when placed in pure oxygen?
Answer Preview: In pure oxygen there is a greater concentrati…

, Chapter: 14 -Problem: 22 >> What is the difference between an element and a compound?
Answer Preview: An element has onl…

, Chapter: 21 -Problem: 29 >> Where are most of the world’s volcanoes formed?
Answer Preview: Most volcanoes are forme…

, Chapter: 7 -Problem: 39 >> Suspend an open-topped container of water in a pan of boiling water, with its top above the surface of the boiling water. You’ll note that although water in the inner container can reach 100°C, it can’t boil. Can you explain why this is so?
Answer Preview: Water at 100C will boil when heat needed for a phase change …

, Chapter: 3 -Problem: 21 >> Compared with the work that the brakes must supply to stop a car moving at some original speed, how much more work must the brakes supply to stop that car if it is moving four times as fast as the original speed? How do the respective stopping distances compare?
Answer Preview: It does 16 tim…

, Chapter: 8 -Problem: 4 >> How does the number of protons in a simple atomic nucleus compare with the number of electrons that orbit the nucleus?
Answer Preview: The numbers …

, Chapter: 24 -Problem: 35 >> Going from continental land toward the deep ocean basin, place these parts of the continental margin in order: (a) slope, (b) shelf, (c) rise, (d) mid-ocean ridge.
Answer Preview: b…

, Chapter: 17 -Problem: 11 >> Why is saying you have 1 mole of water molecules the same as saying you have 6.02 × 1023 water molecules?
Answer Preview: One mole …

, Chapter: 25 -Problem: 21 >> Are clouds that have vertical development characteristic of stable air, stationary air, unstable air, or dry air?
Answer Preview: Clouds with v…

, Chapter: 21 -Problem: 86 >> Reverse faults are created by compressional forces. Where in the United States do we find evidence of reverse faults?
Answer Preview: The Rocky Mountain forelan…

, Chapter: 3 -Problem: 50 >> In Chapter 1 we learned that acceleration a = ?v/?t, and in Chapter 2 we learned that the cause of acceleration involves net force, where a = F/m. Equate these two equations for acceleration and show that, for constant mass, F?t = ?(mv).
Answer Preview: F m v t Cross m…

, Chapter: 10 -Problem: 11 >> What is the law of reflection for sound?
Answer Preview: The angle o…

, Chapter: 23 -Problem: 93 >> How old are the oldest rocks on Earth? About how old are the oldest rocks on the Moon?
Answer Preview: The oldest rocks on Earth are the …

, Chapter: 17 -Problem: 33 >> How many gold atoms are there in a 5.00-g sample of pure gold, Au (197 amu)?
Answer Preview: 5 00 g gold 1 m…

, Chapter: 14 -Problem: 4 >> It would take you 31,800 years to count to a trillion. About how many times would you have to do this to count all the atoms in a single grain of sand?
Answer Preview: It would take you 31 800 years to …

, Chapter: 21 -Problem: 55 >> Speculate on why the lower part of the lithosphere is rigid and the asthenosphere is plastic, even though they are both part of the mantle.
Answer Preview: The lithosphere is rigid because it is compos…

, Chapter: 2 -Problem: 97 >> In an orbiting space craft, you are handed two identical closed boxes, one filled with sand and the other filled with feathers. Discuss at least a couple of ways that you can tell which is which without opening the boxes.
Answer Preview: Poke kick or shake the boxes …

, Chapter: 26 -Problem: 82 >> If you were on the Moon and you looked up and saw a new Earth, would it be nighttime or daytime on the Moon?
Answer Preview: It would be daytime because the Earth is …

, Chapter: 7 -Problem: 74 >> If everything radiates, why doesn’t everything zoom downward in temperature?
Answer Preview: If only emission occurred things would …

, Chapter: 24 -Problem: 19 >> How does radiation emitted from Earth differ from radiation emitted by the Sun?
Answer Preview: Earth radiates l…

, Chapter: 16 -Problem: 52 >> Which should weigh more: 100 mL of fresh water or 100 mL of fresh sparkling seltzer water? Why? Which should weigh more: 100 mL of flat seltzer water at 20°C or the same 100 mL of flat seltzer water brought to 80°C? Why?
Answer Preview: The 100 mL of fresh sparkling seltzer water will weigh more than the 10…

, Chapter: 25 -Problem: 2 >> Why does relative humidity increase at night?
Answer Preview: Relative humidity can change without a …

, Chapter: 21 -Problem: 39 >> List the parts of Earth’s crust in order of generally increasing density:(a) Oceanic crust,(b) Continental crust,(c) Asthenosphere,(d) Lithosphere.
Answer Preview: b…

, Chapter: 2 -Problem: 46 >> Calculate the horizontal force that must be applied to a 1-kg puck for it to accelerate on a horizontal friction-free air table with the same acceleration it would have if it were dropped and fell freely.
Answer Preview: F net m…

, Chapter: 26 -Problem: 64 >> Mercury and Venus are never seen at night straight up toward the top of the sky. Why not?
Answer Preview: As per Figure 26 13, the orbits of Mercury and Venus lie wit…

, Chapter: 8 -Problem: 93 >> Which travels at nearly the speed of light in an electric circuit: electrons, electric field, or both?
Answer Preview: Only the elect…

, Chapter: 23 -Problem: 85 >> How did Pleistocene climate affect land-based animals?
Answer Preview: The cooler temperatures prompted evolution towa…

, Chapter: 16 -Problem: 67 >> Fatty acid molecules can also align to form a bilipid layer that extends in three dimensions. Shown below is a cross section of this structure. This is similar to the micelle shown in Figure 16.23, though notably different because it contains an inner compartment of water. What is this structure called? Figure 16.23 Transc
Answer Preview: This structure is called a cell also known as a lys…

, Chapter: 25 -Problem: 4 >> What does saturation point have to do with dew point?
Answer Preview: Dew point is the temper…

, Chapter: 21 -Problem: 50 >> If Earth’s mantle is composed of rock, how can we say that the crust floats on the mantle?
Answer Preview: Part of Earths mantle is rigid an…

, Chapter: 2 -Problem: 52 >> A force F acts in the forward direction on a cart of mass m. A friction force f opposes this motion. (a) Use Newton’s second law and show that the acceleration of the cart is F - f/m. (b) Show that if the cart’s mass is 4.0 kg, the applied force is 12.0 N, and the friction force is 6.0 N, the cart’s acceleration is 1.5 m/s2.
Answer Preview: a From a Fnet m F …

, Chapter: 26 -Problem: 70 >> Do all moons orbit in the same direction as the direction in which their planet spins?
Answer Preview: Most moons orbit in the same direction as th…

, Chapter: 10 -Problem: 31 >> Tie a rubber tube, a spring, or a rope to a fixed support and shake it to produce standing waves. See how many nodes you can produce.
Answer Preview: The greater the fr…

, Chapter: 17 -Problem: 75 >> According to the second law of thermodynamics, exothermic reactions, such as the burning of wood, are favored because they result in the dispersal of energy. Wood, however, will not spontaneously burn even when exposed to pure oxygen, O2. Why not?
Answer Preview: A chemical reaction may be favored and proceed on its own but often there is …

, Chapter: 14 -Problem: 77 >> What is the common name for oxygen oxide?
Answer Preview: Ox…

, Chapter: 21 -Problem: 87 >> Normal faults are created by tensional forces. Where in the United States do we find evidence of normal faults?
Answer Preview: Virtually the entire state of …

, Chapter: 2 -Problem: 88 >> Suppose that one of the people in Exercise 87 has twice the mass of the other. How far does each person slide before they meet?
Answer Preview: The person with twice the mass slid…

, Chapter: 26 -Problem: 94 >> A meteor is visible only once, but a comet may be visible at regular intervals throughout its lifetime. Why?
Answer Preview: A comets is seen each time …

, Chapter: 8 -Problem: 108 >> (a) Which is the same for a 10-? and a 20-? resistor connected in series in a series circuit: current or voltage? (b) Which is the same for a 10-? and a 20-? resistor connected in parallel in a parallel circuit: current or voltage?
Answer Preview: a Current is the same in a…

, Chapter: 16 -Problem: 56 >> If nitrogen, N2, were pumped into your lungs at high pressure, what would happen to its solubility in your blood?
Answer Preview: The greater the …

, Chapter: 14 -Problem: 64 >> Classify each change as physical or chemical. Even if you are incorrect in your assessment, you should be able to defend why you chose as you did. (a) Grape juice turns to wine. (b) Wood burns to ashes. (c) Water begins to boil. (d) A broken leg mends itself.
Answer Preview: a Chemic…

, Chapter: 21 -Problem: 35 >> If the mid-Atlantic ocean is spreading at 2.5 cm per year, how many years has it taken for it to reach its present width of about 5000 km?
Answer Preview: From distance speed time time distan…

, Chapter: 3 -Problem: 41 >> Show that when a 3.0-kg book is lifted 2.0 m, its increase in gravitational potential energy is 60 J.
Answer Preview: PE mgh …

, Chapter: 26 -Problem: 79 >> In what alignment of Sun, Moon, and Earth does a lunar eclipse occur?
Answer Preview: When all thre…

, Chapter: 8 -Problem: 24 >> What is the function of the third prong on the plug of an electric appliance?
Answer Preview: The third prong is connecte…

, Chapter: 16 -Problem: 73 >> Why is distilling water so relatively expensive?
Answer Preview: The boiling point of water is relative…

, Chapter: 14 -Problem: 50 >> The leftmost diagram below shows the moving particles of a gas within a rigid container. Which of the three boxes on the right—(a), (b), or (c)—best represents this material upon the addition of heat? Transcribed Image Text: (c) (a) (b)
Answer Preview: b The trail lines behind each circle in this diagram are meant to …

, Chapter: 21 -Problem: 14 >> Where are the deepest parts of the ocean?
Answer Preview: The deepest parts …

, Chapter: 3 -Problem: 1 >> Which has greater momentum: an automobile at rest or a moving skateboard?
Answer Preview: A moving …

, Chapter: 26 -Problem: 78 >> In what alignment of Sun, Moon, and Earth does a solar eclipse occur?
Answer Preview: When all thre…

, Chapter: 7 -Problem: 85 >> Whatt does the planet Venus have to do with Earth’s greenhouse effect?
Answer Preview: Venus is thought to have been Ear…

, Chapter: 16 -Problem: 50 >> How many sugar molecules are there in a 2 M sugar solution?
Answer Preview: To answer this question you would need to know the …

, Chapter: 25 -Problem: 13 >> Name at least two ways in which thermal energy in air can be increased.
Answer Preview: Heat can be added t…

, Chapter: 21 -Problem: 83 >> How much more does the ground shake during a magnitude-6.6 earthquake than it does during a magnitude-5.6 earthquake?
Answer Preview: 10…

, Chapter: 3 -Problem: 40 >> Calculate the work done when a 20-N force pushes a cart 3.5 m. Gravitational potential energy = mass × acceleration due to gravity × height; PE = mgh
Answer Preview: W Fd …

, Chapter: 8 -Problem: 61 >> For the electric dryer of the previous problem, show that the number of coulombs that flow through in 1 minute is approximately 500 C. Previous ProblemAn electric dryer connected to a 120-V source draws 8.4 A of current. Show that the amount of heat generated in 1 min is about 60 kJ.
Answer Preview: Since current is charge per unit time charge is …

, Chapter: 16 -Problem: 69 >> A scum forms on the surface of boiling hard water. What is this scum? Why does it form? And why do hot water heaters lose their efficiency sooner in households with hard water?
Answer Preview: The scum forming on the surface of boiling hard water is calcium carbonate coming out of …

, Chapter: 14 -Problem: 10 >> What happens to the chemical identity of a substance during a physical change?
Answer Preview: Nothing During a …

, Chapter: 21 -Problem: 82 >> Why are most earthquakes generated near plate boundaries?
Answer Preview: Stress builds up where plates touch x …

, Chapter: 3 -Problem: 23 >> An apple hanging from a limb has potential energy because of its height. If the apple falls, what becomes of this energy just before the apple hits the ground? When it hits the ground?
Answer Preview: Immediately before hitti…

, Chapter: 26 -Problem: 85 >> Nearly everybody has witnessed a lunar eclipse, but relatively few people have seen a total solar eclipse. Why?  Transcribed Image Text: ? B
Answer Preview: A lunar eclipse is in view of the whole hemisphe…

, Chapter: 10 -Problem: 8 >> In what direction do compressed regions and rarefied regions of a longitudinal wave travel?
Answer Preview: Both compressi…

, Chapter: 16 -Problem: 59 >> At 10°C, which is more concentrated: a saturated solution of sodium nitrate, NaNO3, or a saturated solution of sodium chloride, NaCl? (See Figure 16.20.) Transcribed Image Text: NaNO3 180 160 140 120 LicI 100 80 60 KCI 40 NaCI 20 20 40 80 60 100 Solubility (grams of solute in 100 ml of water)
Answer Preview: At 10C a saturated solut…

, Chapter: 14 -Problem: 14 >> What is a chemical property?
Answer Preview: A chemical bon…

, Chapter: 21 -Problem: 60 >> Upon crystallization, certain minerals (the most important being magnetite) align themselves in the direction of the surrounding magnetic field, providing a magnetic fossil imprint. How does the seafloor’s magnetic record support the theory of continental drift?
Answer Preview: As new rock is extruded on the seafloor the newly form…

, Chapter: 2 -Problem: 51 >> If you stand next to a wall on a frictionless skateboard and push the wall with a force of 40 N, how hard does the wall push on you? Show that if your mass is 80 kg, your acceleration is 0.5 m/s2 away from the wall.
Answer Preview: The wall pus…

, Chapter: 8 -Problem: 60 >> An electric dryer connected to a 120-V source draws 8.4 A of current. Show that the amount of heat generated in 1 min is about 60 kJ.
Answer Preview: The dryers power is P IV 120 …

, Chapter: 16 -Problem: 58 >> Account for the observation that ethanol, C2H5OH, dissolves readily in water, but dimethyl ether, CH3OCH3, which has the same number and kinds of atoms, does not. Transcribed Image Text: ?? ? ?. ? ? ?-?—?-? ?? Ethanol ? Dimethyl ether ?
Answer Preview: The arrangement of atoms within a molecule makes all the differ…

, Chapter: 14 -Problem: 79 >> People often behave differently when they are in a group than when they are by themselves. Explain how this is similar to the behavior of atoms. Is this good news or bad news for the development of nanotechnology?
Answer Preview: A macroscopic sample of an element contains billions upon billions of atoms bunched together The p…

, Chapter: 21 -Problem: 27 >> Which kind of fault forms primarily from tension in Earth’s crust? Primarily from compression?
Answer Preview: Tensional forces …

, Chapter: 3 -Problem: 16 >> A car is raised a certain distance in a service station lift and therefore has potential energy relative to the floor. If it were raised twice as high, how much potential energy would it have compared with what it had in the first case?
Answer Preview: It would have t…

, Chapter: 9 -Problem: 61 >> How do force field lines for gravitation about a planet differ from force field lines for magnetism about electric currents?
Answer Preview: Gravitational field lines emana…

, Chapter: 17 -Problem: 61 >> How many grams of gallium are there in a 145-gram sample of gallium arenside, GaAs?
Answer Preview: There are 69 7 g of gallium G…

, Chapter: 14 -Problem: 5 >> Is a biological cell macroscopic, microscopic, or submicroscopic?
Answer Preview: A biological cel…

, Chapter: 22 -Problem: 1 >> Where does most of Earth’s precipitation occur?
Answer Preview: Earths surface area …

, Chapter: 3 -Problem: 29 >> What is the ultimate source of geothermal energy?
Answer Preview: Radioactivity …

, Chapter: 24 -Problem: 31 >> For an easy-to-make model of air pressure, fill a glass with water. Place a piece of cardboard over the top of the glass and hold the cardboard in place with one hand as you turn the glass upside down. Make sure the cardboard does not bend. Now remove your hand from the cardboard. What happens? Does the cardboard fall off and the water flow out? No, the cardboard remains on the glass. Why? The air
Answer Preview: When you turn the glass upside down and remove your hand from the cardboard, the air pressure on the …

, Chapter: 9 -Problem: 63 >> When a current-carrying wire is placed in a strong magnetic field, no force acts on the wire. What is probably the orientation of the wire?
Answer Preview: The wire is aligned with the magnetic field …

, Chapter: 14 -Problem: 42 >> While visiting a foreign country, a foreign-speaking citizen tries to give you verbal directions to a local museum. After multiple attempts, he is unsuccessful. An onlooker sees your frustration and concludes that you are not smart enough to understand simple directions. Another onlooker sympathizes with you because he knows how difficult it is to navigate through an unfamiliar city. Which onlooke
Answer Preview: Neither You simply dont yet …

, Chapter: 21 -Problem: 91 >> Are the present-day ocean basins a permanent feature on our planet? Discuss why or why not.
Answer Preview: The oceans on our planet have been around since very early in Earths histo…

, Chapter: 16 -Problem: 25 >> Put on your safety glasses and add several cups of tap water to a cooking pot. Boil the water to dryness. (Turn off the burner before the water is all gone. The heat from the pot will finish the evaporation. Watch out for splattering!) Examine the resulting residue by scraping it off with a knife. These are the solids you ingest with every glass of water you drink.
Answer Preview: It would be humorous to scrape the residue from your boiled d…

, Chapter: 2 -Problem: 98 >> Each of the vertebrae forming your spine is separated from its neighbors by discs of elastic tissue. Each step you take acts on your spine like a small jump. Can you think of a reason why you are a little shorter in the evening than you are in the morning?
Answer Preview: Newtons 1 st law again x with slight jumps you tig…

, Chapter: 7 -Problem: 77 >> You enter a crowded and chilly classroom early in the morning on a cold winter day. Before the end of the hour, the room temperature increases to a comfortable level, even if heat is not provided by the school heating system. Why the difference?
Answer Preview: Every student radiates about the …

, Chapter: 23 -Problem: 55 >> If we divide a number by 2, and then divide the result by 2, and so on indefinitely, the answer will never be zero. Why, then, is carbon dating useful only for materials that are no older than about 50,000 years?
Answer Preview: The half life of carbon 14 is only 5760 years …

, Chapter: 14 -Problem: 13 >> What is a chemical property?
Answer Preview: Chemical properties c…

, Chapter: 21 -Problem: 17 >> In what way does seafloor spreading support continental drift?
Answer Preview: Seafloor spreading initiates the movement of the continen…

, Chapter: 15 -Problem: 27 >> Are induced dipoles permanent?
Answer Preview: No induced dipoles are only …

, Chapter: 2 -Problem: 29 >> To what law of physics do we refer when we say you cannot touch without being touched?
Answer Preview: Newtons 3 rd …

, Chapter: 8 -Problem: 101 >> Say the bird perched on a high-voltage wire reaches over with its foot and touches another wire. Why is it in trouble?
Answer Preview: If the nearby wire is at a diff…

, Chapter: 23 -Problem: 33 >> If fine muds were laid down at a rate of 1 cm/1000 yr, how long would it take to accumulate a sequence 1 km thick?
Answer Preview: 1 km 1000 m 1 m 100 cm …

, Chapter: 14 -Problem: 32 >> Who is the ultimate expert at nanotechnology?
Answer Preview: Nature is …

, Chapter: 21 -Problem: 59 >> How is Earth’s crust like a conveyor belt?
Answer Preview: As mantle rock oozes upward new lithosphere is formed Old lithosphe…

, Chapter: 15 -Problem: 20 >> How can a molecule be nonpolar when it consists of atoms that have different electronegativities?
Answer Preview: Dipoles that …

, Chapter: 2 -Problem: 96 >> Discuss whether or not a stick of dynamite contains force. Similarly, does a fist contain force? A hammer? Defend your answers.
Answer Preview: Neither a stick of dynamite a fist a hammer no…

, Chapter: 16 -Problem: 83 >> It is possible to tow icebergs to coastal cities as a source of fresh water. What obstacles—technological, social, environmental, and political—do you foresee for such an endeavor?
Answer Preview: An iceberg holding 20bn gallons of fresh water could meet the needs of a million people for five ye…

, Chapter: 8 -Problem: 132 >> A battery has internal resistance, so when the current it supplies goes up, the voltage it supplies goes down. If too many bulbs are connected in parallel across a battery, does their brightness diminish? Explain.
Answer Preview: Yes there will be a decrease in brightness if too many bulbs are connected in parallel because …

, Chapter: 24 -Problem: 20 >> How is the atmosphere near Earth’s surface heated from below?
Answer Preview: It is heate…

, Chapter: 14 -Problem: 87 >> In the past 20 years, the average life expectancy in most nations has risen by a couple of years. So has the “healthy life expectancy,” which is a measure of how long people remain in good health. Are the two necessarily related? How so?
Answer Preview: We live longer not by extending the duration of our sickness …

, Chapter: 21 -Problem: 62 >> How are the theories of seafloor spreading and continental drift supported by paleomagnetic data?
Answer Preview: There are two supporting types of evidence Apparent polar wandering and mag…

, Chapter: 15 -Problem: 60 >> Write the electron-dot structure for the covalent compound hydrogen cyanide, HCN.
Answer Preview: The electron do…

, Chapter: 3 -Problem: 28 >> What is the ultimate source of the energy supplied by fossil fuels, dams, and windmills?
Answer Preview: The Sun i…

, Chapter: 26 -Problem: 77 >> Since we never see the back side of the Moon, would an observer on the back side of the Moon ever see Earth?
Answer Preview: An observer on the back-side of the Moon would never see the Earth. To see the Ea…

, Chapter: 9 -Problem: 8 >> What is the shape of a magnetic field about a current carrying wire?
Answer Preview: The magnetic fi…

, Chapter: 23 -Problem: 81 >> Why does sea level rise when the rate of seafloor spreading increases?
Answer Preview: Faster seafloor spreading means warmer …

, Chapter: 25 -Problem: 17 >> How do clouds form?
Answer Preview: As warm moist air rises it c…

, Chapter: 21 -Problem: 93 >> Relate the formation of metamorphic rocks to plate tectonics. Would you expect to find metamorphic rocks at all three types of plate boundaries? Why or why not?
Answer Preview: One could find metamorphic rock at all three types o…

, Chapter: 16 -Problem: 6 >> How can a solution be separated from a suspension?
Answer Preview: A centrifuge can be used to …

, Chapter: 28 -Problem: 38 >> After you have given the contemplation of basic goodness a fair shake, there are a zillion other thoughts also worthy of your contemplation. Within the context of this chapter, try contemplating the sheer size of the universe. Envision yourself in your chair, and then mentally zoom out to see yourself in the room, then in the building, then on the planet. Zoom out stepwise so that you can experien
Answer Preview: Another contemplation you can practice is to focus on the …

, Chapter: 19 -Problem: 47 >> Identify the following functional groups in this organic molecule: amide, ester, ketone, ether, alcohol, aldehyde, amine. Transcribed Image Text: C?? "CH? CH? ?? ÇI CH, O CH? H3CO. CH? * NH2 ??? ?
Answer Preview: 1 Ether 2 Amide 3 Ester 4 Ami…

, Chapter: 8 -Problem: 127 >> A friend says that a battery provides not a source of constant current, but a source of constant voltage. Do you agree or disagree, and why?
Answer Preview: Agree with your friend for a …

, Chapter: 23 -Problem: 80 >> Most scientists think the iridium-rich sediments found straddling the Cretaceous–Tertiary boundary can be explained by a meteorite impact. Why are high concentrations of iridium significant?
Answer Preview: The concentration of iridium in a meteorite is about the sam…

, Chapter: 14 -Problem: 6 >> Are atoms made of molecules or are molecules made of atoms?
Answer Preview: Molecules are made of a…

, Chapter: 21 -Problem: 44 >> Compare the relative speeds of primary and secondary seismic waves. Which type of material can each travel through?
Answer Preview: The speed of a wave depends on the type of materi…

, Chapter: 4 -Problem: 38 >> Show that the average force of gravity between Earth (mass = 6.0 × 1024 kg) and the Moon (mass = 7.4 × 1022 kg) is 2.1 × 1020 N. (The average Earth–Moon distance is 3.8 × 108 m.)
Answer Preview: mm d F G 6 6…

, Chapter: 26 -Problem: 76 >> We always see the same face of the Moon because the rotation of the Moon on its axis matches the rate at which it revolves around Earth. Does it follow that an observer on the Moon always sees the same face of Earth?
Answer Preview: An observer from the Moon looking to Earth would see the Earth slowly spinning so that its fac…

, Chapter: 20 -Problem: 102 >> Which type(s) of rock is (are) made from previously existing rock? Which type does not require high temperature and pressure for its formation?
Answer Preview: Metamorphic and sed…

, Chapter: 10 -Problem: 37 >> Swing a buzzer of any kind over your head in a circle. You won’t hear the Doppler shift, but your friends off to the side will. The pitch will increase as the buzzer approaches them and decrease when it recedes. Then switch places with a friend so you can hear it too.
Answer Preview: You wont hear the Doppler shift b…

, Chapter: 24 -Problem: 22 >> What causes pressure differences to arise, and hence causes the wind to blow?
Answer Preview: Unequal heating of Earth…

, Chapter: 14 -Problem: 34 >> Add a pinch of red Kool-Aid crystals to a still glass of hot water. Add the same amount of crystals to a second still glass of cold water. With no stirring, which would you expect to become uniform in color first: the hot water or the cold water? Why?
Answer Preview: The dye should become dispersed uniformly within the hot water first The higher t…

, Chapter: 21 -Problem: 58 >> Describe how the different paths of polar wandering helped establish that continents move over geologic time.
Answer Preview: The apparent path of polar wandering as dete…

, Chapter: 15 -Problem: 25 >> Which is stronger: the ion–dipole attraction or the induced dipole–induced dipole attraction?
Answer Preview: Ion dipole attra…

, Chapter: 26 -Problem: 55 >> Where does the Sun get its energy?
Answer Preview: Solar energy comes from the conversion of mass as was …

, Chapter: 22 -Problem: 24 >> In what two main ways do glaciers flow?
Answer Preview: Plastic flow from the …

, Chapter: 7 -Problem: 113 >> What is the principal reason why a feather quilt is so warm on a cold winter night?
Answer Preview: The feather quilt is an excel…

, Chapter: 24 -Problem: 21 >> What is the underlying cause of air motion?
Answer Preview: The une…

, Chapter: 25 -Problem: 9 >> Distinguish between condensation and precipitation.
Answer Preview: Condensation is the change of …

, Chapter: 21 -Problem: 18 >> Name and describe the three types of plate boundaries.
Answer Preview: Divergent boundaries are where two plates move apart from one another t…

, Chapter: 15 -Problem: 19 >> Which is more polar: a carbon–oxygen bond or a carbon–nitrogen bond?
Answer Preview: A carb…

, Chapter: 19 -Problem: 50 >> What is the difference between a ketone and an aldehyde?
Answer Preview: Both these functional groups contains a carbonyl which is a carbon …

, Chapter: 7 -Problem: 82 >> Why is a water-based white solution (whitewash) sometimes applied to the glass of florists’ greenhouses? Would you expect this practice to be more prevalent in the winter or in the summer?
Answer Preview: When it is desirable to reduce the radiant energy comin…

, Chapter: 24 -Problem: 41 >> Considering that our atmosphere developed as a result of volcanic eruptions, why aren’t there higher traces of atmospheric carbon dioxide, one of the principal volcanic gases?
Answer Preview: CO 2 …

, Chapter: 16 -Problem: 65 >> Would you expect to find more dissolved oxygen in ocean water around the northern latitudes or in ocean water close to the equator? Why?
Answer Preview: Ocean water of northern latitudes is colder The solubility of gasses incre…

, Chapter: 14 -Problem: 75 >> What is the chemical name for a compound with the formula Ba3N2?
Answer Preview: Tribarium dinitride or m…

, Chapter: 18 -Problem: 45 >> Rank the solutions in order of increasing concentration of hydronium ions, H3O+: (a) hydrogen chloride, HCl (concentration = 2 M); (b) acetic acid, CH3COOH (concentration = 2 M); (c) ammonia, NH3 (concentration = 2 M).
Answer Preview: All of these solutions have the same concentration The difference bet…

, Chapter: 16 -Problem: 10 >> Is concentration typically given with the volume of solvent or the volume of solution?
Answer Preview: Liters of solution …

, Chapter: 19 -Problem: 57 >> A common inactive ingredient in products such as sunscreen lotions and shampoo is triethanolamine. What is the chemical structure for this tri-alcohol?
Answer Preview: Three ethanols …

, Chapter: 7 -Problem: 105 >> What role does antifreeze play in preventing the freezing of water?
Answer Preview: Antifreeze presents …

, Chapter: 23 -Problem: 77 >> How did the breakup of Pangaea impact land-based animal and plant life?
Answer Preview: As habitats separated members of the same spe…

, Chapter: 17 -Problem: 32 >> Show that there are 1.0 × 1022 carbon atoms in a 1-carat pure diamond that has a mass of 0.20 g.
Answer Preview: 0 20 g carbon 1 …

, Chapter: 14 -Problem: 71 >> Why isn’t water classified as an element?
Answer Preview: Water use to be classified as an element but t…

, Chapter: 21 -Problem: 22 >> What are the three types of plate collisions that occur at convergent boundaries?
Answer Preview: Oceanicoceanic convergence x the subduction of one oceanic plate beneath another at a deep oc…

, Chapter: 5 -Problem: 39 >> Invert a water-filled soft-drink bottle or small-necked jar. Notice that the water doesn’t simply fall out, but instead gurgles out of the container. Air pressure doesn’t allow the water out until some air has pushed its way up inside the bottle to occupy the space above the liquid. How would an inverted, water-filled bottle pour out if you tried this on the Moon?
Answer Preview: The gurgling is due to air …

, Chapter: 2 -Problem: 119 >> Can a dog wag its tail without the tail in turn “wagging the dog”? (Consider a dog with a relatively massive tail.)
Answer Preview: No for in action reaction fashion …

, Chapter: 13 -Problem: 28 >> Calculate your estimated annual dose of radiation, using the EPA’s radiation dose calculator available at http://www.epa.gov/radiation/understand/calculate.html.
Answer Preview: There are several sources of radiation that can contribute to an individual's annual radiation dose. Some of the main sources include: Natural sources of radiation, such as radon gas, which is present in the air, and cosmic radiation from outer space. Medical procedures, such as x-rays and CT scans, which use ionizing radiation. Consumer products, such as tobacco, which contain radioactive materials. To estimate your annual radiation dose, you can consider the following factors: Where you live: The level of natural radiation in your environment can vary depending on factors such as the elevation and geology of your area. Your occupation: If you work in a field that involves radiation, such as nuclear medicine or aviation, you may be exposed to higher levels of radiation. Your medical history: If you have undergone medical procedures that use ionizing radiation, such as x-rays or CT scans, this will contribute to your annual radiation dose. Your habits: If you smoke tobacco or live in a home with high levels of radon gas, this will also contribute to your annual radiation dose. You can use the EPA's radiation dose …

, Chapter: 21 -Problem: 2 >> Can S-waves travel through liquids?
Answer Preview: No S wav…

, Chapter: 7 -Problem: 102 >> Distinguish between melting and freezing in terms of molecular speeds.
Answer Preview: When molecules in a …

, Chapter: 23 -Problem: 37 >> The geologic time scale is subdivided into eons, eras, periods, and epochs. Rank, from oldest to most recent, the following time periods: (a) Cretaceous, (b) Jurassic, (c) Triassic, (d) Tertiary, (e) Permian.
Answer Preview: e…

, Chapter: 16 -Problem: 57 >> The air a scuba diver breathes is pressurized to counteract the pressure exerted by the water surrounding the diver’s body. Breathing the high-pressure air causes excessive amounts of nitrogen to dissolve in body fluids, especially the blood. If a diver ascends to the surface too rapidly, the nitrogen bubbles out of the body fluids (much like the way carbon dioxide bubbles out of a soda immediatel
Answer Preview: The helium is less soluble in the …

, Chapter: 14 -Problem: 47 >> You combine 50 mL of small BBs with 50 mL of large BBs and get a total of 90 mL of BBs of mixed sizes. Please explain how this occurs.
Answer Preview: The 50 mL plus 50 mL do not add up t…

, Chapter: 18 -Problem: 41 >> When the pH of a solution is 1, the concentration of hydronium ions is 10-1 M = 0.1 M. Assume that the volume of this solution is 500 mL. What is the pH after 500 mL of water is added? You will need a calculator with a logarithm function to answer this question.
Answer Preview: The concentration of hydronium ions in the pH 1 solution is …

, Chapter: 15 -Problem: 2 >> Which electrons are represented by an electron-dot structure?
Answer Preview: Valence elec…

, Chapter: 3 -Problem: 44 >> Calculate the kinetic energy of a 84-kg scooter moving at 10 m/s. Work-energy theorem; W = ?KE.
Answer Preview: KE mv 8…

, Chapter: 24 -Problem: 32 >> The following terms are used to describe a water wave: Crest?the highest elevation above the undisturbed sea surface. Trough?the lowest depression below the undisturbed sea surface. Wavelength?the distance between two successive crests or two successive troughs. Wave height?the vertical distance from the top of the crest to the bottom of the trough. Amplitude? the distance from either the crest or
Answer Preview: Crest: the highest point on the wave, labeled "A" Trough: the lowest point on the wave, labe…

, Chapter: 22 -Problem: 38 >> Rank, from greatest to least amounts, the distribution of Earth’s freshwater: (a) Groundwater, (b) Polar ice caps and glaciers, (c) Streams, rivers, and lakes, (d) Soil moisture. Distribution The word "distribution" has several meanings in the financial world, most of them pertaining to the payment of assets from a fund, account, or individual security to an investor or be
Answer Preview: b…

, Chapter: 7 -Problem: 117 >> How do the average kinetic energies of hydrogen and oxygen gases compare when these two gases are mixed at the same temperature? How do the average speeds of their molecules compare? Discuss how mass is the crux of these questions.
Answer Preview: If they have the same temperature then …

, Chapter: 23 -Problem: 96 >> What circumstances are likely to lead to the formation of continental-scale glaciers?
Answer Preview: Global scale cooling leading to continental scale glaciers …

, Chapter: 16 -Problem: 64 >> Why can 500 mL of fresh water absorb more gaseous carbon dioxide than 500 mL of sugar water at the same temperature?
Answer Preview: The 500 mL of fresh water …

, Chapter: 14 -Problem: 48 >> You combine 50 mL of water with 50 mL of purified alcohol and get a total of 98 mL of the mixture. Please explain how this occurs.
Answer Preview: The 50 mL plus 50 mL do not add up to 100 mL because within the mix man…

, Chapter: 21 -Problem: 45 >> How can seismic waves indicate whether regions inside Earth are solid or liquid?
Answer Preview: P waves travel through both solids and liquids whereas …

, Chapter: 7 -Problem: 111 >> Your friend says that more thermal energy is needed to increase a gram of water from absolute zero to its boiling point than is needed to boil the water once it reaches 100°C. Do you agree or disagree?
Answer Preview: Agree for along the way from absolute zero to boiling …

, Chapter: 2 -Problem: 41 >> A 120-kg astronaut recedes from her spacecraft by activating a small propulsion unit attached to her back. The force generated by a spurt from this device is 30 N. Show that her acceleration is 0.25 m/s2.
Answer Preview: F a ne…

, Chapter: 26 -Problem: 65 >> As evidenced in the photos that make up Figure 26.17, the sky when viewed from Mars is not blue, as it is when viewed from Earth. Why not?
Answer Preview: As discussed in Section 11 5, the nitrogen and oxygen molecules in Earths atmo…

, Chapter: 20 -Problem: 90 >> What is a fossil? How are fossils used in the study of geology?
Answer Preview: Fossils are essentially the remains of anci…

, Chapter: 8 -Problem: 102 >> What does it mean to say that an electric appliance is “grounded”?
Answer Preview: Being grounded means there is no poten…

, Chapter: 17 -Problem: 52 >> The reactants shown schematically on the left represent methane, CH4, and water, H2O. Write out the full balanced chemical equation that is depicted.
Answer Preview: CH …

, Chapter: 14 -Problem: 85 >> “A calculator is useful but certainly not exciting.” Why would someone from 100 years ago vehemently disagree with this statement? We often marvel at a new technology, but how long does this marveling last? How soon before a new technology becomes assumed? Think of other examples. Is technology the source of happiness?
Answer Preview: A new technology seems to maintain its marvel for several years and then …

, Chapter: 21 -Problem: 23 >> What is a transform boundary?
Answer Preview: A transform boundary is where two plates are neither collidin…

, Chapter: 15 -Problem: 29 >> Use toothpicks and gumdrops or jelly beans of different colors to build models of the molecules shown in Figures 15.17 through 15.19 and Figure 15.21, letting the different colors represent different elements. Once you have become proficient at building these models, test your expertise by building models for difluoromethane, CH2F2; ethane, C2H6; hydrogen peroxide, H2O2; and acetylene, C2H2. Keep
Answer Preview: Your model of CH 2 F 2 should look like the methane of Fig…

, Chapter: 3 -Problem: 46 >> Show that a 2,500,000-J change in kinetic energy occurs for an airplane that is moved 500 m in takeoff by a sustained force of 5000 N. Transcribed Image Text: work Power %| time
Answer Preview: From W KE …

, Chapter: 19 -Problem: 44 >> What are the chemical formulas for the following structures? Transcribed Image Text: ?? (b) (a) (c) (d)
Answer Preview: a C 7 H 1…

, Chapter: 9 -Problem: 11 >> How is the strength of the magnetic field in a current carrying coil affected when a piece of iron is placed inside? Defend your answer.
Answer Preview: A piece of iron strength…

, Chapter: 17 -Problem: 55 >> How many moles of molecules are there in each of the following? (a) 28 grams of nitrogen, N2 (b) 32 grams of oxygen, O2 (c) 32 grams of methane, CH4 (d) 38 grams of fluorine, F2
Answer Preview: a There is 1 mol of N 2 in 28 g …

, Chapter: 25 -Problem: 16 >> What happens to the air pressure and temperature of an air parcel as it flows up the side of a mountain?
Answer Preview: Air pressure always decreases with …

, Chapter: 21 -Problem: 63 >> Where is Earth’s longest mountain range located?
Answer Preview: In the middle of the Atlantic Ocean …

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