Physical and Chemical Changes

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. Examples include melting ice or tearing paper.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances. Examples include rusting iron or baking a cake.

Front

Is boiling water a physical or chemical change?

Back

Boiling water is a physical change because it changes from liquid to gas but remains H2O.

Front

What happens to molecules when a substance is heated?

Back

When a substance is heated, the energy increases, causing the molecules to move faster.

Front

What is an example of a reversible physical change?

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An example of a reversible physical change is freezing water to make ice.

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What is an example of an irreversible chemical change?

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An example of an irreversible chemical change is burning wood, which produces ash and smoke.

Front

What evidence indicates a chemical change has occurred?

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Evidence of a chemical change includes color change, gas production, temperature change, and formation of a precipitate.

Front

What is a solution?

Back

A solution is a mixture formed when a solid dissolves in a liquid, resulting in a homogeneous mixture.

Front

What is an example of a physical change in cooking?

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An example of a physical change in cooking is chopping vegetables.

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What is an example of a chemical change in cooking?

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An example of a chemical change in cooking is baking bread, where ingredients undergo a chemical reaction.