Chapter 8: What is a chemical reaction?

Increasing temperature is one way to slow down some chemical reactions.

• False. Increasing temperature is one way to speed up some chemical reactions.

• True. Increasing temperature is one way to slow down some chemical reactions.

• False. Increasing temperature is one way to stop all chemical reactions.

• False. Increasing temperature is one way to reverse chemical reactions.

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Any substance formed in a chemical reaction is called a product.

• True

• Reactant

• Mixture

• Element

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Chemical reaction in which electrons are gained

• reduction

• oxidation

• combustion

• hydrolysis

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Reaction in which one element replaces another element in a compound

• single replacement

• double replacement

• decomposition

• combustion

Substance that is changed in a chemical reaction

• reactant

• product

• catalyst

• solvent

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An example of a chemical reaction is

• rusting.

• evaporating.

• boiling.

• condensing.

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Which of the following is said to occur when atoms of an element gain electrons?

• reduction

• oxidation

• absorption

• decomposition

Substances present at the start of a chemical reaction are called

• reactants.

• products.

• precipitates.

• coefficients.

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A chemical equation is made up of the formulas for the reactants and the products separated by

• an equal sign.

• a triangle.

• an arrow.

• a circle.

When a substance combines chemically with oxygen, the reaction is called

• reduction.

• oxidation.

• synthesis.

• decomposition.