States of Matter & Thermal Energy Review

If 2 objects have different temperatures, heat will flow...

• from the warmer object to the cooler object

• from the cooler object to the warmer object

As a substance cools down,

• the molecules become closer together and slower

• the molecules spread out and move faster

• the molecules stay the same

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This image shows a closed system that has undergone a change. What has caused this change?

• More particles were added to the system

• Water was added to the system

• Heat was added to the system

• Air was added to the system

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As water in the freezer turns into ice,

• the water does not absorb or release energy

• the water absorbs energy from the cold air in the freezer

• the particles in the water speed up

• the freezer air absorbs heat from the water

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Compare ice and liquid water.

• The liquid water is more dense than ice

• The ice is more dense than the water

• The molecules in ice and liquid water are arranged the same way

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What happens when you hold an ice cube in your hand?

• Thermal energy flows from the ice cube to your hand

• Thermal energy flows from your hand to the ice cube

• Energy flows back and forth between your hand and the ice cube

• The ice immediately turns into a gas

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The faster the molecules are moving,

• the higher the temperature

• the lower the temperature

• particle movement doesn't relate to temperature

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When water vapor (gas) turns directly into ice on a window, it's an example of

• sublimination

• condensation

• deposition

• evaporation

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Describe what happens to the particles when liquid water is heated until it boils.

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What happens to the particles of a solid object, like a metal spoon, when it's heated?

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