Chemical or Physical Change

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What is a chemical change?

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A chemical change is a process where substances combine or break apart to form new substances with different properties.

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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.

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Example of a chemical change: Grilling a piece of fish. Why is it a chemical change?

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Grilling a piece of fish changes its chemical structure, creating new substances (like cooked proteins) and altering its flavor.

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Example of a physical change: Sharpening a pencil. Why is it a physical change?

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Sharpening a pencil changes its shape but does not change the material of the pencil itself.

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What happens during a chemical change?

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During a chemical change, bonds between atoms are broken and new bonds are formed, resulting in new substances.

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What happens during a physical change?

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During a physical change, the substance may change its state (solid, liquid, gas) or shape, but its chemical identity remains the same.

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Example of a chemical change: Frying an egg. Why is it a chemical change?

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Frying an egg changes its proteins and creates new substances, such as cooked egg.

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Example of a physical change: Dissolving sugar in hot water. Why is it a physical change?

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Dissolving sugar in water changes its state but does not change the chemical structure of sugar.

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What is an indicator of a chemical change?

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Indicators of a chemical change include color change, temperature change, gas production, and the formation of a precipitate.

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What is an indicator of a physical change?

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Indicators of a physical change include changes in state, shape, or size without altering the substance's chemical identity.