INTRODUCTION UNIT TEST #2 (PERIODS 2, 4, 7)
Multiple Choice: Choose the best answer for each question. Bubble in the correct space on the scan sheet.
54. Which of the following is an example of cohesion?
A. Water transforming into vapor
B. Water soaking into a paper towel
C. Water slowly dissolving rocks over time
D. Water forming droplets during a rain storm
55. A water molecule contains two hydrogen atoms and one oxygen atom. Which of the following
statements about water molecules is true?
A. All of the atoms have a positive charge.
B. All of the atoms have a negative charge.
C. The oxygen atom is positively charged and the hydrogen atoms are negatively charged.
D. The oxygen atom is negatively charged and the hydrogen atoms are positively charged.
56. Why does solid water (ice) float when placed in liquid water?
A. Ice does not float in liquid water.
B. Ice is less dense than liquid water.
C. Ice is denser than liquid water.
D. The densities of liquid water and ice are the same.
57. Tai grows plants in a container called a terrarium. He keeps it on a sunny sill. The terrarium is closed,
so Tai cannot add water to the plants. However, the plants have enough water to grow. Which of
these statements best explains why the plants always have enough water?
A. The air cannot hold all of the water vapor.
B. Water is unable to evaporate from the soil.
C. The plants take up water and store it in their stems and leaves.
D. Energy from the sun cycles water through the soil, the plants and the air.
58. Which process changes water into a gaseous state?
A. Sublimation
B. Precipitation
C. Condensation
D. Evaporation
E. Both A and D
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59. On an island near the equator, the sun’s energy causes ocean water to evaporate during the day. In
the afternoon, heavy rains fall. This process is repeated during the summer months. What does this
example best show?
A. How most water on Earth is in the form of water vapor
B. How land is the main source of water during the water cycle
C. How the sun is the main source of energy for the water cycle
D. How the ocean is large enough that it never runs out of water
60. Some hurricanes originate in the tropical regions of the Atlantic Ocean or Caribbean Sea, and they
often travel along the coast of Florida. The figure below shows a hurricane cloud that formed over the
Atlantic Ocean. Which two processes would have occurred for the hurricane to form over the ocean?
A.
B.
C.
D.
Freezing and condensation
Evaporation and precipitation
Evaporation and condensation
Condensation and precipitation
Multiple Choice: Choose the best answer for each question. Bubble in the correct space on the scan sheet.
61. The average amount of energy of motion in the molecules of a substance is called
A. Heat
B. Temperature
C. Energy
D. Density
62. The movement of energy from a hotter object to a cooler object is called
A. Heat
B. Temperature
C. Energy
D. Density
63. The ability to do work or create change is called _____?
A. Heat
B. Temperature
C. Energy
D. Density
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Use the pictures to the right for questions 64-66
64. Which picture(s) illustrates heat transfer by convection?
A. A
B. B
C. C
D. A and C
The arrows
65. Which picture(s) illustrates heat transfer by conduction?
A. A
B. B
C. C
D. A and C
66. Which picture(s) illustrate heat transfer by radiation?
A. A
B. B
C. C
D. B and C
Multiple Choice: Choose the best answer for each question. Bubble in the correct space on the scan sheet.
67. The energy of motion is called
A. Potential energy
B. Heat energy
C. Kinetic energy
D. Chemical energy
68. As you raise the temperature of a substance, what happens to its molecules?
A. The molecules become larger, spread out and have more kinetic energy.
B. The molecules become smaller, contract and have less kinetic energy.
C. The molecules become faster, spread out and have more kinetic energy.
D. The molecules become slower, contract and have less kinetic energy.
69. Which statement correctly identifies how solid water is different from liquid water?
A. In solid water the molecules are farther apart.
B. Only in solid water are the molecules not polar.
C. In solid water the molecules are closer together.
D. Only in solid water do the molecules lack spaces between them.
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70. Which of the following is the BEST example of how the water cycle carries on energy transfer?
A. A flooding river depositing silt on a floodplain
B. A warm ocean current warming the air above it
C. Ocean water depositing sand particles on a shore
D. Water seeping through the soil and dissolving salts
71. Which example of water’s importance on Earth most directly relates to the economic health of developing
countries?
A. Most of Earth’s water is in the form of salt water.
B. Adequate water supplies are needed to grow food crops.
C. Every living organism on Earth is made up partly o water.
D. Water has a much higher heat capacity than other substances.
72. How does the property of cohesion affect the way liquid water behaves?
A. Water forms droplets whenever possible.
B. When water freezes, it becomes less dense.
C. Water retains heat longer than other substances.
D. When water vaporizes, it stores more energy than liquid water stores.
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NAME _____________________________________________________ PERIOD ___________________
INTRODUCTION TEST #2 OPEN-ENDED QUESTIONS (PERIODS 2, 4, 7)
Write on this paper and hand in.
Periods 2 and 7 choose one of the following.
Period 4 complete both.
1. To have a valid experiment how many variables should it have? Explain and give an example.
2. Define each of the words below and give an example of each.
Mixture –
Compound –
Element -
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