Unit 4 Review 2

Choose the two parts of the water cycle in which water absorbs energy.

• condensation

• evaporation

• melting

• precipitation

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6.6.c

Water puddles on a sidewalk evaporate when the Sun heats the water. Which of these best describes what is happening as the water evaporates?

• Water changes phase as it releases heat to the environment.

• Water boils as it absorbs energy from the sidewalk.

• Water becomes a gas as it absorbs energy from the Sun.

• Water evaporates as its thermal energy is transferred to the air.

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6.6.c

Condensation in the water cycle can best be described as the result of water vapor

• rising into the atmosphere, cooling and changing into a liquid form.

• rising into the atmosphere, warming and changing into a gaseous form.

• changing from a liquid form into a solid and forming snow.

• changing from a gas form into a solid and forming hail.

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6.6.c

At which temperature does water freeze?

• 0 degrees Celsius

• 32 degrees Celsius

• 100 degrees Celsius

• 212 degrees Celsius

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6.6.c

The teacher heats a pot of water. Once the water reaches 100°C, which point has the water reached?

• boiling

• melting

• freezing

• evaporating

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6.6.c

When water is changed from a liquid to a gas, what occurs?

• The atoms lose electrons.

• A new compound is formed.

• Molecules spread farther apart

• Hydrogen is separated from oxygen.

Which statement describes the reason why an ice cube melts when set out in a warm room?

• Heat from the room is absorbed by the ice cube.

• The ice cube molecules move more slowly.

• One side of the ice cube is colder than the other.

• Heat from the ice cube moves into the air.

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6.6.c

Which statement best explains why ice cubes will melt in a glass of tea?

• The tea becomes saturated.

• The ice cubes gain energy.

• The tea’s freezing point increases.

• The ice cube’s melting point decreases.

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6.6.c

When moist air comes in contact with a cold surface in the winter, one result can be frost. What is the process that occurs when water vapor in the air turns to frost?

• sublimation

• deposition

• evaporation

• condensation

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6.6.c

Which picture best shows what change occurs when heat is added to ice?

• 
• 
• 
• 

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6.6.c