Physical and Chemical Changes

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What is a physical change?

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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?

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A chemical change is a change that results in the formation of new chemical substances. It involves a chemical reaction and changes the molecular structure of the substance. Examples include burning, cooking, and rusting.

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Is burning wood a physical or chemical change?

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Burning wood is a chemical change because it transforms the wood into ash, smoke, and gases, creating new substances.

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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. Examples include reactivity with acids, flammability, and oxidation states.

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What happens to the chemical composition of a substance during a physical change?

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The chemical composition of a substance remains unchanged during a physical change.

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What is an example of a physical change?

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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 cooking an egg.

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How can you identify a chemical change?

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You can identify a chemical change by observing signs such as color change, gas production, temperature change, or the formation of a precipitate.

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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 chemical property of water?

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An example of a chemical property of water is its ability to react with sodium.