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Chemical Reactions

Total questions: 103

Worksheet time: 3hrs 26mins

Name
Class
Date
1.

The decomposition of a substance by an electric current is called ___.

a)

conduction

b)

electrolysis

c)

transformation

d)

ionization

2.

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

a)

double-replacement reaction

b)

ionic reaction

c)

synthesis reaction

d)

decomposition reaction

3.

When a binary compound decomposes, what is produced?

a)

an acid

b)

two elements

c)

a tertiary compound

d)

an oxide

4.

The equation A + BX  -->  AX + B is the general equation for a ___.

a)

single-replacement reaction

b)

combustion reaction

c)

double-replacement reaction

d)

decomposition reaction

5.

The equation AX + BY --> AY + BX is the general equation for a ___.

a)

synthesis reaction

b)

double-replacement reaction

c)

decomposition reaction

d)

single-replacement reaction

6.

In what kind of reaction does one element replace a similar element in a compound?

a)

ionic reaction

b)

decomposition reaction

c)

single-replacement reaction

d)

double-replacement reaction

7.

Many metal hydroxides decompose when heated to yield metal oxides and ___.

a)

metal hydrides

b)

an acid

c)

carbon dioxide

d)

water

8.

When a metal chlorate is heated, it decomposes to yield a metal chloride and ___.

a)

hydrogen

b)

oxygen

c)

a metal hydroxide

d)

a metal oxide

9.

In one type of synthesis reaction, an element combines with oxygen to yield a(n) ___.

a)

metal

b)

acid

c)

oxide

d)

hydroxide

10.

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

a)

electrolysis

b)

halogens

c)

sodium

d)

water

11.

In a double-replacement reaction, hydrogen chloride and sodium hydroxide react to produce sodium chloride. Another product is ___.

a)

hydrogen gas

b)

water

c)

sodium hydride

d)

potassium chloride

12.

The equation AX  -->  A + X is the general equation for a ___.

a)

combustion reaction

b)

single-replacement reaction

c)

synthesis reaction

d)

decomposition reaction

13.

An active metal and a halogen react to form a(n) ___.

a)

salt

b)

oxide

c)

hydroxide

d)

acid

14.

The reaction 2Mg(s) + O2(g)  -->  2MgO(s) is a ___.

a)

single-replacement reaction

b)

decomposition reaction

c)

synthesis reaction

d)

double-replacement reaction

15.

When a slightly soluble solid compound is produced in a double-replacement reaction, a ___.

a)

halogen is produced

b)

combustion reaction takes place

c)

gas bubbles off

d)

precipitate is formed

16.

Group 1 metals react with water to produce metal hydroxides and ___.

a)

oxygen

b)

hydrogen

c)

metal hydroxides

d)

hydrochloric acid

17.

The equation A + X  -->  AX is the general equation for a(n) ___.

a)

combustion reaction

b)

synthesis reaction

c)

ionic reaction

d)

double-replacement reaction

18.

When heated, a metal carbonate decomposes into a metal oxide and ___.

a)

carbon

b)

hydrogen

c)

carbon dioxide

d)

oxygen

19.

The reaction Mg(s) + 2HCl(aq)  -->  H2(g) + MgCl2(aq) is a ___.

a)

composition reaction

b)

double-replacement reaction

c)

single-replacement reaction

d)

decomposition

20.

The reaction Cl2(g) + 2KBr(aq)  -->  2KCl(aq) + Br2(l) is a(n) ___.

a)

ionic reaction

b)

combustion reaction

c)

single-replacement reaction

d)

synthesis reaction

21.

In the equation 2Al(s) + 3Fe(NO3)2(aq)  -->  3Fe(s) + 2Al(NO3)3(aq), iron has been replaced by ___.

a)

aluminum

b)

nitrate

c)

water

d)

nitrogen

22.

The reaction Pb(NO3)2(aq) + 2KI(aq)  -->  PbI2(s) + 2KNO3(aq) is a ___.

a)

synthesis reaction

b)

double-replacement reaction

c)

combustion reaction

d)

decomposition reaction

23.

In writing an equation that produces hydrogen gas, the correct representation of hydrogen gas is ___.

a)

H2

b)

OH

c)

2H

d)

H

24.

What is the balanced equation when aluminum reacts with copper(II) sulfate?

a)

Al + CuSO4  -->  AlSO4 + Cu

b)

Al + Cu2S  -->  Al2S + Cu

c)

2Al + Cu2SO4  -->  Al2SO4 + 2Cu

d)

2Al + 3CuSO4  -->  Al2(SO4)3 + 3Cu

25.

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

a)

coefficients

b)

formulas of the products

c)

number of products

d)

subscripts

26.

After the correct formula for a reactant in an equation has been written, the ___.

a)

symbols in the formula must not appear on the product side of the equation

b)

formula should not be changed

c)

same formula must appear as the product

d)

subscripts are adjusted to balance the equation

27.

A solid produced by a chemical reaction in solution that separates from the solution is called ___.

a)

a reactant

b)

the mass of the product

c)

a molecule

d)

a precipitate

28.

Knowledge about what products are produced in a chemical reaction is obtained by ___.

a)

laboratory analysis

b)

inspecting the chemical equation

c)

balancing the chemical equation

d)

writing a word equation

29.

For the formula equation 2Mg + O2 --> 2MgO, the word equation would begin "___".

a)

Magnesium plus oxygen . . .

b)

Molybdenum plus oxygen . . .

c)

Heat plus oxygen . . .

d)

Manganese plus oxygen . . .

30.

A chemical equation is balanced when the ___.

a)

subscripts of the reactants equal the subscripts of the products

b)

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

c)

coefficients of the reactants equal the coefficients of the products

d)

products and reactants are the same chemicals

31.

What is the balanced equation for the combustion of sulfur?

a)

S(s) + O2(g)  --> SO2(g)

b)

2S(s) + 3O2(g)  -->  SO3(g)

c)

S(s) + O2(g)  -->  SO(g)

d)

S(s) + 2O2(g)  -->  SO42–(aq)

32.

The complete balanced equation for the reaction between zinc hydroxide and acetic acid is ___.

a)

Zn(OH)2 + 2CH3COOH  -->  Zn(CH3COO)2 + 2H2O

b)

ZnOH + CH3COOH  -->  ZnCH3COO + H2O

c)

Zn(OH)2 + 2CH3COOH  -->  Zn(CH3COO)2 + H2 + O2

d)

Zn(OH)2 + CH3COOH  -->  Zn + 2CO2 +3H2O

33.

A chemical reaction has NOT occurred if the products have ___.

a)

more total bond energy than the reactants

b)

the same chemical properties as the reactants

c)

the same mass as the reactants

d)

less total bond energy than the reactants

34.

A chemical formula written over the arrow in a chemical equation signifies ___.

a)

an impurity

b)

the formation of a gas

c)

a catalyst for the reaction

d)

a byproduct

35.

According to the law of conservation of mass, the total mass of the reacting substances is ___.

a)

always less 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 more than the total mass of the products

36.

How would oxygen be represented in the formula equation for the reaction of methane and oxygen to yield carbon dioxide and water?

a)

O2

b)

O3

c)

O

d)

oxygen

37.

Which equation is NOT balanced?

a)

H2 + H2 + O2  -->  H2O + H2O

b)

4H2 + 2O2  -->  4H2O

c)

2H2 + O2  -->  2H2O

d)

2H2 + O2  -->  H2O

38.

When sodium metal reacts with water, one product formed is ___.

a)

oxygen gas

b)

salt

c)

hydrogen gas

d)

sodium oxide

39.

Which observation does NOT indicate that a chemical reaction has occurred?

a)

formation of a precipitate

b)

change in total mass of substances

c)

evolution of heat and light

d)

production of a gas

40.

Which word equation represents the reaction that produces water from hydrogen and oxygen?

a)

Water can be separated into hydrogen and oxygen.

b)

Hydrogen plus oxygen yields water.

c)

H2 + O2 --> water

d)

Water is produced from hydrogen and oxygen.

41.

Which coefficients correctly balance the formula equation NH4NO2(s) --> N2(g) + H2O(l)?

a)

1, 1, 2

b)

1, 2, 2

c)

2, 2, 2

d)

2, 1, 1

42.

Which of the following substances could be produced from SO3 only by an oxidation-reduction reaction? (INCORRECT)

a)

H2SO3

b)

Na2SO4

c)

SF6

d)

H2SO4

43.

What are the oxidation numbers in the compound H3PO4?

a)

H = +1, P = 0, O = –2

b)

H = +1, P = +1, O = –1

c)

H = –1, P = +7, O = –1

d)

H = +1, P = +5, O = –2

44.

In the reaction O2 + 4e–   --> 2O2–, the species O2 is ___.

a)

reduced

b)

electrolyzed

c)

oxidized

d)

autooxidized

45.

What is the most common oxidation number of combined hydrogen?

a)

-1

b)

-2

c)

+1

d)

0

46.

In a balanced redox equation, how does the total number of reactant atoms compare with the total number of product atoms?

a)

No relationship exists between the two numbers.

b)

Product atoms are always more numerous.

c)

Reactant atoms are always more numerous.

d)

The two numbers are always equal.

47.

A species whose oxidation number increases in a reaction is ___.

a)

reduced

b)

autooxidized

c)

oxidized

d)

electrolyzed

48.

In a redox reaction, MnO4– is changed to MnO42–. How many electrons must be lost or gained by Mn?

a)

none lost or gained

b)

one lost

c)

two gained

d)

one gained

49.

In a balanced redox equation, how does the total number of reactant molecules compare with the total number of product molecules?

a)

Product molecules are always more numerous.

b)

Reactant molecules are always more numerous.

c)

The two numbers are always equal.

d)

No relationship exists between the two numbers.

50.

Which of the following is an oxidation-reduction reaction?

a)

2e– + F2  -->  2F–

b)

Na  -->  Na+ + e–

c)

N2O4  -->  2NO2

d)

2SO2 + O2  -->  2SO3

51.

How does the number of electrons lost in an oxidation compare with the number gained in the simultaneous reduction?

a)

The two numbers are always equal.

b)

The number lost is always greater than the number gained.

c)

No relationship exists between the two numbers.

d)

The number lost is always less than the number gained.

52.

What are the oxidation numbers in the compound H2O2?

a)

H = –1, O = –2

b)

H = +1, O = –1

c)

H = +1, O = –2

d)

H = +2, O = –2

53.

In a redox reaction, CO is changed to CO2. How many electrons must be lost or gained by C?

a)

one lost

b)

two gained

c)

two lost

d)

one gained

54.

Which of the following is NOT an oxidation-reduction reaction?

a)

H2O + SO2  -->  H2SO3

b)

H2 + Cl2  -->  2HCl

c)

2NaBr + Cl2  -->  2NaCl + Br2

d)

N2 + O2  -->  2NO

55.

In a reduction, atoms or ions ___.

a)

have a zero oxidation number after the reaction

b)

decrease their oxidation number

c)

increase their oxidation number

d)

do not change their oxidation number

56.

Another name for an oxidation-reduction reaction is a(n) ___.

a)

decomposition reaction

b)

double-replacement reaction

c)

redox reaction

d)

electrochemical reaction

57.

The algebraic sum of the oxidation numbers of the atoms in a compound ___.

a)

is always +1

b)

can be any whole number

c)

is always –1

d)

is always zero

58.

In the reaction F2 + Mg  -->  2F– + Mg2+, which species is oxidized?

a)

both Mg and F2

b)

Mg only

c)

F2 only

d)

neither Mg nor F2

59.

What are the oxidation numbers in the ion SO32–?

a)

S = +4, O = –2

b)

S = +6, O = –2

c)

S = +1, O = –1

d)

S = 0, O = –1

60.

In a redox reaction, MnO4– is changed to Mn2+. How many electrons must be lost or gained by Mn?

a)

two lost

b)

five lost

c)

two gained

d)

five gained

61.

In the reaction Fe  -->   Fe3+ + 3e–, the species Fe is ___.

a)

oxidized

b)

autooxidized

c)

electrolyzed

d)

reduced

62.

In an oxidation, atoms or ions ___.

a)

increase their oxidation number

b)

decrease their oxidation number

c)

have a zero oxidation number after the reaction

d)

do not change their oxidation number

63.

If species change their oxidation numbers, the process is a(n) ___.

a)

electrolysis

b)

oxidation-reduction reaction

c)

synthesis

d)

decomposition

64.

Al2Cl6  What is the formal oxidation state of the boldface and underlined atom?

(a)  

65.

(NH4)2MoO4  What is the formal oxidation state of the boldface and underlined atom?

(a)  

66.

Na2Cr2O7  What is the formal oxidation state of the boldface and underlined atom?

(a)  

67.

HgCl2  What is the formal oxidation state of the boldface and underlined atom?

(a)  

68.

(ClO3)-1  What is the formal oxidation state of the boldface and underlined atom?

(a)  

69.

copper(II) chloride      What is the formal oxidation state of the boldface and underlined atom?

(a)  

70.

What is the formal oxidation state of the boldface and underlined atom in CH3CH2CH3?

(a)  

71.

SO2  What is the formal oxidation state of the boldface and underlined atom?

(a)  

72.

What is the formal oxidation state of the boldface and underlined atom in XeF6?

(a)  

73.

SO3    What is the formal oxidation state of the boldface and underlined atom?

(a)  

74.

(MnO4)-1  What is the formal oxidation state of the boldface and underlined atom?

(a)  

75.

H2O    What is the formal oxidation state of the boldface and underlined atom?

(a)  

76.

C2H6  What is the formal oxidation state of the boldface and underlined atom?

(a)  

77.

S8  What is the formal oxidation state of the boldface and underlined atom?

(a)  

78.

Na2SO4  What is the formal oxidation state of the boldface and underlined atom?

(a)  

79.

The reaction 2HgO(s)  --> 2Hg(l) + O2(g) is a(n) ___.

a)

single-replacement reaction

b)

decomposition reaction

c)

ionic reaction

d)

synthesis reaction

80.

What is the most common oxidation number of combined oxygen?

a)

-1

b)

-2

c)

0

d)

+1

81.

What are the oxidation numbers in the compound NO2?

a)

N = +2, O = –1

b)

N = +4, O = –2

c)

N = –2, O = +1

d)

N = +2, O = –2

82.

Which of the following is an oxidation-reduction reaction?

a)

H2 + Cl2  -->  2HCl

b)

2O–  -->  O2^2-

c)

HCl + NaBr  -->  HBr + NaCl

d)

H2  -->  2H

83.

An insoluble gas that forms in a double-replacement reaction in aqueous solution ___.

a)

bubbles out of solution

b)

forms a precipitate

c)

reacts with the water

d)

disassociates into ions

84.

What is the formal oxidation state of the boldface and underlined atom in HCN ?

(a)  

85.

In what kind of reaction do the ions of two compounds exchange places in aqueous solution to form two new compounds?

a)

decomposition reaction

b)

synthesis reaction

c)

double-replacement reaction

d)

combustion reaction

86.

What is the formal oxidation state of the boldface and underlined atom in CHCl3 ?

(a)  

87.

Oxides of active metals, such as CaO, react with water to produce ___.

a)

acids

b)

metal carbonates

c)

metal hydrides

d)

metal hydroxides

88.

H2O2  What is the formal oxidation state of the boldface and underlined atom?

(a)  

89.

Hg2Cl2  What is the formal oxidation state of the boldface and underlined atom?

(a)  

90.

After the first steps in writing an equation, the equation is balanced by ___.

a)

changing the products formed

b)

adjusting coefficients to the smallest whole-number ratio

c)

making the number of reactants equal to the number of products

d)

adjusting subscripts to the formula(s)

91.

The reaction 2KClO3(s)  -->  2KCl(s) + 3O2(g) is a(n) ___.

a)

decomposition reaction

b)

synthesis reaction

c)

ionic reaction

d)

combustion reaction

92.

What are the oxidation numbers in the compound KCl?

a)

K = –1, Cl = +1

b)

K = 0, Cl = 0

c)

K = +2, Cl = –2

d)

K = +1, Cl = –1

93.

In the reaction 2K + Br2  -->  2K+ + 2Br–, which species is reduced?

a)

both K and Br2

b)

Br2 only

c)

neither K nor Br2

d)

K only

94.

What is the oxidation number of a monatomic ion?

a)

0

b)

its charge

c)

its number of electrons

d)

+1

95.

Which of the following are numbers assigned to atoms and ions to keep track of electrons?

a)

oxidation numbers

b)

electrode potentials

c)

charges

d)

coefficients

96.

In a balanced redox equation, how does the total charge of reactants compare with the total charge of products?

a)

Total reactant charge is always greater.

b)

The two totals are always equal.

c)

No relationship exists between the two totals.

d)

Total product charge is always greater.

97.

O3  What is the formal oxidation state of the boldface and underlined atom?

(a)  

98.

CH2Cl2   What is the formal oxidation state of the boldface and underlined atom?

(a)  

99.

In the reaction Na+ + Br–  -->  NaBr, which species is reduced?

a)

Br– only

b)

neither Na+ nor Br–

c)

Na+ only

d)

both Na+ and Br–

100.

A species whose oxidation number decreases in a reaction is ___.

a)

reduced

b)

electrolyzed

c)

autooxidized

d)

oxidized

101.

mercury(I) oxide      What is the formal oxidation state of the boldface and underlined atom?

(a)  

102.

Oxidation and reduction ___.

a)

always occur with oxidation first, then reduction

b)

always occur at different times

c)

always occur simultaneously

d)

do not occur in the same reaction

103.

What is the formal oxidation state of the boldface and underlined atom in CH3OH?

(a)  

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