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, freezing, and dissolving.

Front

What is a chemical change?

Back

A chemical change occurs when substances combine or break apart to form new substances with different properties. Examples include rusting, burning, and baking.

Front

What is an example of a chemical change?

Back

Baking powder fizzing is an example of a chemical change.

Front

What evidence shows that a chemical reaction has taken place?

Back

A change in color, such as a pair of scissors turning orange due to rust, indicates a chemical reaction.

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Can most chemical changes be reversed?

Back

No, most chemical changes cannot be reversed.

Front

What is a chemical property?

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A chemical property is a characteristic of a substance that can only be observed during a chemical reaction, such as flammability or reactivity.

Front

What happens to matter during a physical change?

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Matter remains the same before and after a physical change; it only changes form or appearance.

Front

What is an example of a physical change?

Back

Ice melting into water is an example of a physical change.

Front

What is the difference between a physical change and a chemical change?

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A physical change does not alter the chemical composition of a substance, while a chemical change results in the formation of new substances.

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What is an example of a reversible physical change?

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Freezing and melting of water is an example of a reversible physical change.