Chemical and Physical Changes

Front

What is a chemical change?

Back

A chemical change is a process where one or more substances are transformed into different substances with new chemical properties.

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What is a physical change?

Back

A physical change is a process that alters the form or appearance of a substance without changing its chemical composition.

Front

Give an example of a chemical change.

Back

An example of a chemical change is the reaction of sodium with water, producing sodium hydroxide and hydrogen gas.

Front

Give an example of a physical change.

Back

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

Front

What happens to the chemical composition during a chemical change?

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During a chemical change, the chemical composition of the substances involved changes, resulting in the formation of new substances.

Front

What happens to the chemical composition during a physical change?

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During a physical change, the chemical composition of the substance remains the same, even though its form may change.

Front

Is dissolving sodium hydroxide in water a chemical or physical change?

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Dissolving sodium hydroxide in water is a physical change.

Front

What is meant by a change in the state of matter?

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A change in the state of matter refers to the transition of a substance from one state (solid, liquid, gas) to another, such as melting or freezing.

Front

What are the indicators of a chemical change?

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Indicators of a chemical change include color change, temperature change, gas production, and the formation of a precipitate.

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What are the indicators of a physical change?

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Indicators of a physical change include changes in state, shape, size, or appearance without altering the substance's chemical identity.