Physical and Chemical Change

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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.

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What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances, involving a rearrangement of atoms.

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What is an example of a physical change?

Back

Melting ice is an example of a physical change, as it changes from solid to liquid without changing its chemical structure.

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What is an example of a chemical change?

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Burning wood is an example of a chemical change, as it produces new substances like ash and smoke.

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What is the boiling point of water?

Back

The boiling point of water is 100 °C (212 °F) at standard atmospheric pressure.

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What happens to water when it freezes?

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When water freezes, it undergoes a physical change from a liquid to a solid.

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What is needed for boiling to occur?

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Heat is needed for boiling to occur, as it provides the energy required to change a liquid into a gas.

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What is the difference between boiling and melting?

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Boiling is the process of a liquid turning into a gas, while melting is the process of a solid turning into a liquid.

Front

What is an example of a substance undergoing a chemical change?

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Frying eggs is an example of a chemical change, as it transforms the raw egg into a cooked state with different properties.

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What is the role of heat in physical and chemical changes?

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Heat can provide the energy necessary for both physical changes (like melting and boiling) and chemical changes (like combustion).