Chapter 8

In an equation, the symbol for a substance in water solution is followed by a. (aq). b. (g). c. (1). d. (s).

(aq)

Which coefficients correctly balance the formula equation CaO + H2O ® Ca(OH)2? a. 1, 2, 1 b. 1, 2, 3 c. 2, 1, 2 d. 1, 1, 1

1,1,1

Which equation is not balanced? a. H2 + H2 + O2 ® H2O + H2O b. 4H2 + 2O2 ® 4H2O c. 2H2 + O2 ® 2H2O d. 2H2 + O2 ® H2Og

2H2 + O2 ® H2Og

Which reaction does not occur? a. 2HCl(aq) + Mg(s) ® MgCl2(aq) + H2(g) b. 2HF(aq) + Cl2(g) ® F2(g) + 2HCl(aq) c. 2Na(s) + ZnF2(aq) ® 2NaF(aq) + Zn(s) d. Fe(s) + CuCl2(aq) ® FeCl2(aq) + Cu(s)

2HF(aq) + Cl2(g) ® F2(g) + 2HCl(aq)

Which of the following is a formula equation for the formation of carbon dioxide from carbon and oxygen? a. Carbon plus oxygen yields carbon dioxide. b. 2C + O ® CO2 c. CO2 ® C + O2 d. C + O2 ® CO2

C + O2 ® CO2

Predict what happens when calcium metal is added to a solution of magnesium chloride. a. Calcium chloride forms. b. Gaseous calcium is produced. c. Magnesium calcite forms. d. No reaction occurs.

Calcium chloride forms

In writing a chemical equation that produces hydrogen gas, the correct representation of hydrogen gas is a. OH. b. H. c. 2H. d. H2.

H2

Magnesium bromide (aq) + chlorine (g) yields a. MgCl2(aq) and Br2(l). b. MgCl(aq) and Br2(l). c. Mg(s) and BrCl(aq). d. MgBrCl(aq).

MgCl2(aq) and Br2(l).

The formulas for the products of the reaction between sodium hydroxide and sulfuric acid are a. SI4 and Na2O. b. S + O2 and Na. c. NaSO4 and H2O. d. Na2SO4 and H2O.

Na2SO4 and H2O

In the word equation, sodium oxide + water ® sodium hydroxide, the formula for sodium hydroxide is represented by a. NaO2. b. Na2O. c. Na2OH. d. NaOH.

NaOH

Predict what happens when zinc is added to water. a. Hydrogen is released. b. Steam is produced. c. No reaction occurs. d. Zinc oxide forms.

No reaction occurs

What is the small whole number that appears in front of a formula in a chemical equation? a. a subscript b. a ratio c. a coefficient d. a superscript

a coefficient

When a solid produced by a chemical reaction separates from the solution it is called a. a reactant. b. a molecule. c. the mass of the product. d. a precipitate.

a precipitate

The ability of an element to react is the element's a. activity. b. electronegativity. c. valence. d. stability.

activity

What is the name of a list of elements arranged according to the ease with which they undergo certain chemical reactions? a. activity series b. periodic list c. reactivity list d. reaction sequence

activity series

According to the law of conservation of mass, the total mass of the reacting substances is a. always more than the total mass of the products. b. always equal to the total mass of the products. c. sometimes more and sometimes less than the total mass of the products. d. always less than the total mass of the products.

always equal to the total mass of the products

The activity series of metals indicates the ease with which metal a. atoms gain neutrons. b. atoms form covalent bonds. c. atoms lose electrons. d. nuclei fuse.

atoms lose electrons

An element in the activity series can replace any element a. in the periodic table. b. in its group. c. below it on the list. d. above it on the list.

below it on the list

The reaction of calcium oxide, CaO, with water yields a. calcium hydroxide. b. calcium and a salt. c. calcium and oxygen gas. d. carbon dioxide and water.

calcium hydroxide

Which observation does not indicate that a chemical reaction has occurred? a. change in total mass of substances b. production of a gas c. formation of a precipitate d. evolution of heat and light

change in total mass of substances

To balance a chemical equation, it may be necessary to adjust the a. formulas of the products. b. number of products. c. subscripts. d. coefficients.

coefficients

The equation AX ® A + X is the general equation for a a. synthesis reaction. b. decomposition reaction. c. single-displacement reaction. d. combustion reaction.

decomposition reaction

The reaction represented by the equation 2KClO3(s) ® 2KCl(s) + 3O2(g) is a(n) a. synthesis reaction. b. ionic reaction. c. decomposition reaction. d. combustion reaction.

decomposition reaction

The equation AX + BY ® AY + BX is the general equation for a a. decomposition reaction. b. double-displacement reaction. c. single-displacement reaction. d. synthesis reaction.

double-displacement reaction

The decomposition of a substance by an electric current is called a. electrolysis. b. conduction. c. transformation. d. ionization.

electrolysis

If a certain metal is placed in an ionic solution containing another metal and no reaction occurs, then the metal originally in the solution is a. not on the activity series. b. unreactive. c. a halogen. d. higher on the activity series.

higher on the activity series

Group 1 metals react with water to produce metal hydroxides and a. hydrogen. b. metal hydroxides. c. hydrochloric acid. d. oxygen.

hydrogen

Predict what happens when lead is added to nitric acid. a. Oxygen is released. b. Hydrogen is released. c. Lead oxide forms. d. No reaction occurs.

hydrogen is released

Oxides of active metals, such as CaO, react with water to produce a. acids. b. metal hydroxides. c. metal carbonates. d. metal hydrides.

metal hydroxides

Predict what happens when nickel is added to a solution of potassium chloride. a. Nickel chloride forms. b. Potassium nickel chloride forms. c. Hydrochloric acid forms. d. No reaction occurs.

no reaction occurs

In one type of synthesis reaction, an element combines with oxygen to yield a(n) a. hydroxide. b. acid. c. oxide. d. metal.

oxide

A chemical equation is balanced when the a. subscripts of the reactants equal the subscripts of the products. b. coefficients of the reactants equal the coefficients of the products. c. products and reactants are the same chemicals. d. same number of each kind of atom appears in the reactants and in the products.

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

The reaction represented by the equation Cl2(g) + 2KBr(aq) ® 2KCl(aq) + Br2(l) is a(n) a. combustion reaction. b. synthesis reaction. c. decomposition reaction. d. single-displacement reaction.

single-displacement reaction.

The reaction represented by the equation Mg(s) + 2HCl(aq) ® H2(g) + MgCl2(aq) is a a. decomposition reaction. b. composition reaction. c. double-displacement reaction. d. single-displacement reaction.

single-displacement reaction.

When sodium chlorate, NaClO3, decomposes, the products are a. sodium hydroxide and water. b. sodium oxide and chlorine. c. sodium chloride and oxygen. d. sodium and chlorine oxide

sodium chloride and oxygen

The equation A + X ® AX is the general equation for a(n) Selected Answer: a. synthesis reaction. b. ionic reaction. c. combustion reaction. d. double-displacement reaction.

synthesis reaction

When a binary compound decomposes, what is produced? a. a tertiary compound b. two elements c. an acid d. an oxide

two elements

In a double-displacement reaction, hydrogen chloride and sodium hydroxide react to produce sodium chloride. Another product is a. hydrogen gas. b. sodium hydride. c. water. d. potassium chloride.

water

What can be predicted by using an activity series? a. the melting points of elements b. whether a certain chemical reaction will occur c. the amount of energy released by a chemical reaction d. the electronegativity values of elements

whether a certain chemical reaction will occur