PS 5.1.3 Heating and Cooling

What happens to the weight of an object when it is heated and then cooled back to its original temperature?

• The weight increases.

• The weight decreases.

• The weight remains the same.

• The weight fluctuates.

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Which of the following is an example of a new substance being formed?

• Mixing sand and water.

• Dissolving sugar in water.

• Baking a cake.

• Melting ice.

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When water is heated, it changes from a liquid to a gas. What is this process called?

• Freezing

• Condensation

• Evaporation

• Sublimation

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If you mix vinegar and baking soda, what type of change occurs?

• Physical change

• Chemical change

• No change

• Reversible change

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Which of the following materials expands when heated and contracts when cooled?

• Wood

• Metal

• Plastic

• Glass

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What happens to the molecules of a substance when it is cooled?

• They move faster.

• They move slower.

• They disappear.

• They change color.

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Which of the following is NOT a result of heating a substance?

• Expansion

• Contraction

• Melting

• Evaporation

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What is the main purpose of cooling food in a refrigerator?

• To make it taste better

• To preserve it by slowing down bacterial growth

• To change its color

• To make it heavier

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Which of the following processes involves a physical change?

• Burning wood

• Rusting iron

• Melting ice

• Baking bread

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What happens to the volume of water when it freezes?

• It increases.

• It decreases.

• It remains the same.

• It evaporates.

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