Physical & Chemical Properties/Changes

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What is a physical change?

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A physical change is a change that alters the physical properties of a substance but does not change 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 cannot be undone. Examples include burning, rusting, and digestion.

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What is an indicator of a chemical change?

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An indicator of a chemical change can include a change in temperature without an external heat source, the formation of gas, or a color change.

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Is melting a chocolate bar a physical or chemical change?

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Melting a chocolate bar is a physical change.

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What happens to the properties of a substance during a physical change?

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The physical properties of a substance may change, but the substance itself remains the same.

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What is an example of a physical change?

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An example of a physical change is tearing a piece of paper.

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What is an example of a chemical change?

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An example of a chemical change is iron rusting.

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What does it mean when a substance undergoes a physical change?

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It means that the substance changes its form or appearance but not its chemical identity.

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What is the difference between physical and chemical changes?

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Physical changes do not create new substances, while chemical changes do.

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What is an example of a chemical change that produces gas?

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An example of a chemical change that produces gas is the reaction between baking soda and vinegar.