Understanding Changes in Matter

What is a physical change in matter?

• A change in the shape or size of matter without changing its identity.

• A change that creates a new substance.

• A change that involves heat and light.

• A change that cannot be reversed.

Which of the following is an example of a chemical change?

• Melting ice into water.

• Burning wood into ash and smoke.

• Cutting paper into shapes.

• Freezing water into ice.

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Why are chemical changes not easy to reverse?

• Because they involve a change in shape or size.

• Because they create new substances.

• Because they are visible changes.

• Because they are physical changes.

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What often accompanies chemical changes?

• A change in shape.

• A change in size.

• Heat, light, or color changes.

• A change in state.

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How do physical changes help us in everyday life?

• By creating new substances.

• By helping us understand how matter can be used in different ways.

• By making changes that are not visible.

• By involving heat and light.

What is an example of a physical change mentioned in the passage?

• Burning wood.

• Baking a cake.

• Cutting paper into shapes.

• Mixing ingredients.

How does learning about changes in matter help us?

• It helps us create new substances.

• It helps us understand the world better and how things can be used in new ways.

• It helps us reverse chemical changes.

• It helps us avoid physical changes.

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