Thermal Expansion: As the temperature of a substance increases, its particles move faster and spread farther a substance to expand When a substance cools.its particles slow down and the substance Questions: 7. What happens to the size of a substance when it is heated? 8. Why do substances expand when heated and contract when cooled?

Question

Thermal Expansion: As the temperature of a substance increases, its particles move faster and spread farther a substance to expand When a substance cools.its particles slow down and the substance Questions: 7. What happens to the size of a substance when it is heated? 8. Why do substances expand when heated and contract when cooled?

Answer 1

7. When a substance is heated, it expands.8. Substances expand when heated because the particles move faster and spread farther apart. They contract when cooled because the particles slow down and come closer together.

Answer 2

## Step 1The first question asks about the change in size of a substance when it is heated. According to the given context, when a substance is heated, its particles move faster and spread farther apart. This causes the substance to expand.## Step 2The second question asks why substances expand when heated and contract when cooled. The explanation provided in the context is that as the temperature of a substance increases, its particles move faster and spread farther apart. This causes the substance to expand. Conversely, when a substance cools, its particles slow down and come closer together, causing the substance to contract.

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