Chemical and physical 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 boiling.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances. It involves breaking and forming bonds between atoms. Examples include burning, rusting, and baking.

Front

What happens to the matter during a physical change?

Back

During a physical change, the matter remains the same substance before and after the change, even though its form may change.

Front

What happens to the matter during a chemical change?

Back

During a chemical change, the matter transforms into one or more new substances with different properties.

Front

Is melting ice a physical or chemical change?

Back

Melting ice is a physical change because it changes from solid to liquid but remains water.

Front

Is burning wood a physical or chemical change?

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Burning wood is a chemical change because it produces new substances like ash and smoke.

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What is an example of a physical change?

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An example of a physical change is boiling water, where water changes from liquid to gas but remains H2O.

Front

What is an example of a chemical change?

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An example of a chemical change is baking a cake, where ingredients react to form a new substance.

Front

Can physical changes be reversed?

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Many physical changes can be reversed, such as freezing and melting, but some may not be easily reversible.

Front

Can chemical changes be reversed?

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Chemical changes usually cannot be reversed by simple physical means, as they create new substances.