Chemical and Physical Changes

Front

What is a chemical change?

Back

A process where substances combine or break apart to form new substances, often accompanied by energy changes.

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What is a physical change?

Back

A change that affects one or more physical properties of a substance without altering its chemical composition.

Front

What are signs of a chemical reaction?

Back

Signs include color change, temperature change, gas production, and formation of a precipitate.

Front

What is an example of a physical change?

Back

Melting ice, boiling water, or breaking a glass.

Front

What is NOT a sign of a chemical reaction?

Back

A phase change.

Front

What is an indicator of a physical change?

Back

Shape change.

Front

What does 'dissolving' indicate?

Back

Dissolving is a physical change, not a chemical change.

Front

What happens during a chemical change?

Back

The original substances are transformed into different substances with new properties.

Front

Can a physical change be reversed?

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Yes, many physical changes can be reversed, such as freezing and melting.

Front

What is an example of a chemical change?

Back

Burning wood, rusting iron, or baking a cake.