Chemical Reactions

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Mg and O

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Which of the following indicates that a chemical reaction has occurred?

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Formation of a gas

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Reactant

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What is the BEST definition of a chemical reaction?

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A change in matter that produces one or more NEW substances.

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What does the Law of Conservation of Mass state?

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The mass of the reactants and mass of the products are equal.

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What is a product in a chemical reaction?

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A substance formed as a result of a chemical reaction.

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What is a balanced chemical equation?

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An equation where the number of atoms for each element is the same on both sides.

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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 alter the chemical composition, while a chemical change does.

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What is an example of a chemical reaction?

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Burning wood, which produces ash, smoke, and gases.

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What is meant by 'activation energy' in a chemical reaction?

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The minimum energy required for a reaction to occur.