Physical & Chemical Changes & Properties

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 breaking, melting, and dissolving.

Front

What is a chemical change?

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A chemical change is a change that results in the formation of new chemical substances. It involves a chemical reaction and the rearrangement of atoms. Examples include burning, rusting, and cooking.

Front

What is the difference between physical and chemical properties?

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Physical properties can be observed without changing the substance's identity (e.g., color, melting point), while chemical properties can only be observed during a chemical reaction (e.g., reactivity with acid).

Front

Is breaking a cracker into pieces a physical or chemical change?

Back

Physical change.

Front

Is melting butter a physical or chemical change?

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Physical change.

Front

What happens to the chemical composition during a physical change?

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The chemical composition remains the same during a physical change.

Front

What happens to the chemical composition during a chemical change?

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The chemical composition changes during a chemical change, resulting in new substances.

Front

Is making salt water a physical or chemical change?

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Physical change.

Front

What is an example of a chemical change?

Back

An example of a chemical change is the rusting of iron.

Front

What is an example of a physical change?

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