8.5E Evidence of Chemical Reactions

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What is a chemical reaction?

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A process that involves the transformation of one or more substances into new substances with different properties.

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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 but does not alter its chemical composition.

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What is a chemical change?

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A change that results in the formation of new chemical substances.

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What is a precipitate?

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

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What is an example of a chemical change?

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Sour milk is an example of a chemical change due to the formation of new substances.

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What is an example of a physical change?

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Crumpling paper is an example of a physical change as it does not change the chemical composition of the paper.

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How can you identify a chemical change?

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By observing indicators such as color change, temperature change, gas production, or the formation of a precipitate.

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What happens to matter during a chemical change?

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Matter is neither created nor destroyed; it is rearranged to form new substances.

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

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A physical change does not produce new substances, while a chemical change does.

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What is oxidation?

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A chemical reaction where a substance loses electrons, often resulting in a change in color or formation of rust.