#115 (Q) Chemical/Physical Changes

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What is a chemical change?

Back

A chemical change is a process where substances combine or break apart to form new substances with different properties. Examples include burning, rusting, and digestion.

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What is a physical change?

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A physical change is a process that alters the form or appearance of a substance but does not change its chemical composition. Examples include melting, freezing, and cutting.

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What happens during an explosion?

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An explosion is a rapid chemical change that releases energy, often producing heat, light, and sound.

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What is flammability?

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Flammability is a chemical property that describes how easily a substance can ignite and burn.

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What is a phase change?

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A phase change is a physical change that occurs when a substance changes from one state of matter to another, such as solid to liquid or liquid to gas.

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What does it mean to have the same substance after a change?

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If a substance remains the same after a change, it indicates a physical change has occurred, as the chemical composition has not altered.

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What is an example of a physical change involving food?

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Cutting up fruit to make a salad is a physical change because the fruit's chemical composition remains the same.

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What is the difference between a chemical and physical change?

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A chemical change results in the formation of new substances, while a physical change alters the form or appearance without changing the substance's identity.

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Can a chemical change be reversed?

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Some chemical changes can be reversed through chemical reactions, but many cannot, such as burning wood.

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Can a physical change be reversed?

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Yes, most physical changes can be reversed, such as freezing and melting water.