Lesson 1 Review Flashcard: Physical and Chemical Changes

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What is a physical change?

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A physical change is a change that does not alter the chemical identity of a substance. Examples include changes in state (solid, liquid, gas), size, or shape.

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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 one or more new substances with different chemical identities. Examples include rusting, burning, and cooking.

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How can you identify a physical change?

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You can identify a physical change if the material can be easily separated or returned to its original state.

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How can you identify a chemical change?

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

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

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The identity of the substance remains the same during a physical change.

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What happens to the identity of a substance during a chemical change?

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The identity of the substance changes during a chemical change, resulting in new substances.

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What is an example of a physical change?

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An example of a physical change is melting ice 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 baking a cake, where new substances are formed.

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What is a precipitate?

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A precipitate is a solid that forms from a liquid solution during a chemical reaction.

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What is an indicator of a chemical reaction?

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A significant change in color is an indicator that a chemical reaction may have occurred.