Chemistry: Chapter 8

When a solid produced by a chemical reaction separates from the solution it is called

• a precipitate.

• a reactant.

• a molecule.

• the mass of the product.

In writing a chemical equation that produces hydrogen gas, the correct representation of hydrogen gas is

• H.

• 2H.

• H₂.

• OH.

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To balance a chemical equation, it may be necessary to adjust the

• coefficients.

• subscripts.

• formulas of the products.

• number of products.

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A chemical equation is balanced when the

• coefficients of the reactants equal the coefficients of the products.

• same number of each kind of atom appears in the reactants and in the products.

• products and reactants are the same chemicals.

• subscripts of the reactants equal the subscripts of the products.

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In an equation, the symbol for a substance in water solution is followed by

• (l).

• (g).

• (aq).

• (s).

In what kind of reaction do two or more substances combine to form a new compound?

• decomposition reaction

• synthesis reaction

• single-displacement reaction

• ionic reaction

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In what kind of reaction does a single compound produce two or more simpler substances?

• decomposition reaction

• synthesis reaction

• single-displacement reaction

• ionic reaction

When a binary compound decomposes, what is produced?

• an oxide

• an acid

• a tertiary compound

• two elements

In the equation 2Al_(s) + 3Fe(NO₃)_2(aq) → 3Fe_(s) + 2Al(NO₃)_2(aq), iron has been replaced by

• nitrate.

• water.

• aluminum.

• nitrogen.

The replacement of bromine by chlorine in a salt is an example of a single-displacement reaction by

• halogens.

• sodium.

• water.

• electrolysis.

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