Properties & Changes of Matter Pretest

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What is a chemical change?

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A process where a substance transforms into a different substance with new properties, often involving a reaction that changes the chemical composition.

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What is a physical change?

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A change that affects one or more physical properties of a substance without altering its chemical composition.

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What is a chemical property?

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A characteristic of a substance that can only be observed during a chemical reaction, indicating how a substance interacts with other substances.

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What is a physical property?

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A characteristic of a substance that can be observed or measured without changing the substance's chemical identity.

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How does temperature affect the rate of a chemical reaction?

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Generally, increasing the temperature increases the rate of a chemical reaction, as particles move faster and collide more often.

Front

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

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The properties of the substance change, and it may become a new substance with different physical and chemical properties.

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What is an example of a physical change?

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Carving a piece of wood into a new shape is a physical change because the wood's chemical composition remains the same.

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What is an example of a chemical change?

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Burning wood in a campfire, which produces ash and smoke, is a chemical change because it creates new substances.

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What is the significance of observing a color change in a substance?

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A color change can indicate a chemical change has occurred, suggesting that new substances may have formed.

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What is the difference between a chemical change and a physical change?

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A chemical change results in the formation of new substances, while a physical change does not alter the chemical identity of the substance.