JDES Physical and Chemical Changes

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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. Examples include melting, freezing, and dissolving.

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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. It involves a chemical reaction and includes processes like burning, rusting, and digestion.

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What is soot?

Back

Soot is a black powdery substance that is produced when wood or other organic materials burn. It is a result of incomplete combustion.

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What happens to water when it boils?

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When water boils, it changes from a liquid to a gas (steam) due to the increase in temperature.

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What is rust?

Back

Rust is a reddish-brown flaky substance that forms when iron reacts with oxygen and moisture in the air, resulting in a chemical change.

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What is an example of a physical change?

Back

An example of a physical change is ice melting into water.

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What is an example of a chemical change?

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An example of a chemical change is wood burning to produce ash and smoke.

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What is evaporation?

Back

Evaporation is the process by which liquid water turns into water vapor (gas) when it is heated.

Front

What is condensation?

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Condensation is the process by which water vapor (gas) cools and turns back into liquid water.

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What is the difference between a physical and 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.