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
