6.1 Physical and Chemical Changes and Properties

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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 includes changes such as rusting, burning, and cooking.

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What is a physical property?

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A physical property is a characteristic of a substance that can be observed or measured without changing the substance's chemical identity. Examples include color, odor, and boiling point.

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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 acid and flammability.

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What is an example of a sign that a chemical change has occurred?

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Change in color, formation of a gas, or the release of heat are signs that a chemical change has occurred.

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What happens during a physical change?

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During a physical change, the form of a substance changes, but its chemical composition remains the same.

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What happens during a chemical change?

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During a chemical change, the substances involved undergo a transformation that results in the formation of new substances with different properties.

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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 iron rusting when exposed to moisture.

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What does it mean if a substance reacts with water to produce gas?

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It indicates a chemical change has occurred, as new substances are formed.