6.6E Evidence of Chemical Change

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What is a chemical change?

Back

A process where substances combine or break apart to form new substances with different properties.

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What is evidence of a chemical change?

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Indicators that a chemical reaction has occurred, such as the formation of a new substance, color change, gas production, or temperature change.

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What does rust formation indicate?

Back

It indicates a chemical change where iron reacts with oxygen and moisture to form iron oxide.

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What is the significance of bubbles in a reaction?

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Bubbles can indicate the formation of a gas, which is evidence of a chemical change.

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What happens when a solid forms from a liquid?

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It may indicate a chemical reaction, especially if the solid is a new substance.

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What is the role of a fume hood in chemical experiments?

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A fume hood is used to safely conduct experiments that may release harmful gases or vapors.

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What does a color change in a solution often signify?

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It can signify a chemical reaction has occurred, resulting in the formation of a new substance.

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

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A physical change alters the form of a substance without changing its chemical composition, while a chemical change results in the formation of new substances.

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What is an example of a physical change?

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Breaking a rock into smaller pieces.

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What is an example of a chemical change?

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Baking a cake, where ingredients react to form a new product.