Introduction to Thermal Energy

All matter has thermal energy because atoms are constantly ________________.

• moving

• resting

• disappearing

• shrinking

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Which would have more thermal energy: a cup of room temperature water or a cup of cold water?

• A cup of room temperature water

• A cup of cold water

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Removing thermal energy from liquid water can cause it to change to what state?

• Solid

• Gas

• Plasma

• Liquid

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Give two everyday examples of the thermal energy of a substance being increased.

• a. Heating water on a stove b. Ironing clothes

• a. Freezing water into ice b. Melting ice cream

• a. Boiling an egg b. Baking a cake

• a. Cooling a drink in the refrigerator b. Drying clothes in the sun

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Give two everyday examples of the thermal energy of a substance being decreased.

• a. Water freezing in a freezer b. Ice melting in a glass

• a. Coffee cooling down in a cup b. Ice cream melting on a hot day

• a. Water boiling on a stove b. Soup cooling down in a bowl

• a. Water freezing in a freezer b. Coffee cooling down in a cup

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In which substance are molecules moving the fastest?

• Solid water (ice)

• Liquid water

• Water vapor (gas)

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Hand warmers and instant cold packs use ________________ that release or absorb thermal energy.

• chemical reactions

• physical changes

• mechanical processes

• electrical circuits

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If you sprain your ankle and place a cold pack on it, in which direction does thermal energy move?

• From the cold pack to the ankle

• From the ankle to the cold pack

• There is no movement of thermal energy

• Thermal energy moves in both directions equally

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If you sprain your ankle and place a cold pack on it, how does the motion of molecules in your ankle change?

• The motion of molecules decreases as the temperature drops.

• The motion of molecules increases as the temperature drops.

• The motion of molecules remains unchanged.

• The motion of molecules becomes erratic and unpredictable.

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An inflated balloon placed in a freezer would get (a)   because the air molecules in the balloon would (b)   .

• deflated

• contract

• expand

• remain the same

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