Physical and Chemical Change/Properties

Front

What is a physical change?

Back

A physical change is a change in which some physical properties of a substance change, but the substance retains its identity.

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What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances, often accompanied by observable changes such as color change, temperature change, or gas production.

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What is the difference between physical properties and chemical properties?

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Physical properties can be observed without changing the substance's identity (e.g., color, melting point), while chemical properties describe a substance's ability to undergo a chemical change (e.g., reactivity with acid).

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

Back

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

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What is an example of a physical change?

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Melting ice into water is an example of a physical change.

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What is an example of a chemical change?

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Baking soda reacting with vinegar to produce carbon dioxide gas is an example of a chemical change.

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What indicates a chemical change has occurred?

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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 a precipitate?

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A precipitate is a solid that forms and settles out of a liquid mixture during a chemical reaction.

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What is the significance of temperature change in a chemical reaction?

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A temperature change can indicate that a chemical reaction has occurred, as it often involves the release or absorption of energy.

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What is the role of energy in chemical changes?

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Energy is involved in breaking and forming bonds during chemical changes, which can result in heat being released or absorbed.