Chemical and Physical Changes in Matter

What is a physical change?

• A change in the form or appearance of a substance without changing its identity

• A change that results in the formation of a new substance

• A change that is always irreversible

• A change that involves the release of gas

Explain the difference between a physical change and a chemical change.

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Understanding

When water freezes into ice, it is an example of a ___ change.

Which of the following is a sign of a chemical change?

• Change in size

• Change in shape

• Release of gas

• Change in state

Describe a real-life scenario where understanding chemical changes is important.

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Applying

Rusting of iron is an example of a ___ change.

What happens to the molecules in food when it is cooked?

• They remain unchanged

• They change to create new flavors and textures

• They disappear

• They become larger