7.6A Chemical & Physical Change Retake Assessment

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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 changes the identity of the substance. Examples include burning, rusting, and digestion.

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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 flammability, reactivity with acid, and oxidation states.

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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 identity. Examples include color, melting point, and density.

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What evidence indicates a physical change has occurred?

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Evidence of a physical change includes changes in state (solid, liquid, gas), shape, or size, and the ability to reverse the change.

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What evidence indicates a chemical change has occurred?

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Evidence of a chemical change includes the production of gas, formation of a precipitate, color change, and temperature change.

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

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The properties of a substance may change in appearance or state, but its chemical composition remains the same.

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

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The properties of a substance change completely, resulting in the formation of one or more new substances with different chemical compositions.

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What is an example of a reversible physical change?

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An example of a reversible physical change is melting ice into water and then freezing it back into ice.

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What is an example of an irreversible chemical change?

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An example of an irreversible chemical change is burning wood, which produces ash and smoke.