Chemical Reactions

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What is a chemical reaction?

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A process where substances (reactants) undergo a transformation to form new substances (products).

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What is evidence of a chemical change?

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

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What is a reactant?

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A substance that is present at the start of a chemical reaction and is consumed during the reaction.

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What is a product?

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A substance that is formed as a result of a chemical reaction.

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What does the chemical formula NO₂ represent?

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Nitrogen dioxide, which consists of one nitrogen atom and two oxygen atoms.

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What is temperature change in a chemical reaction?

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A change in temperature that indicates a chemical reaction has occurred, often releasing or absorbing heat.

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What is the significance of gas production in a chemical reaction?

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The production of gas or bubbles is a strong indicator that a chemical change has taken place.

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