Exam
Name___________________________________
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
1) When the following equation is balanced, the coefficients are __________.
1)
C8 H18 + O2 → CO2 + H2 O
A) 2, 12, 8, 9
B) 4, 4, 32, 36
C) 2, 3, 4, 4
D) 1, 4, 8, 9
E) 2, 25, 16, 18
2) Of the reactions below, which one is not a combination reaction?
A) 2N2 + 3H2 → 2NH3
2)
B) 2CH 4 + 4O2 → 2CO2 + 4H2 O
C) C + O2 → CO2
D) CaO + H2 O → Ca(OH)2
E) 2Mg + O2 → 2MgO
3) When a hydrocarbon burns in air, what component of air reacts?
A) water
B) argon
C) oxygen
D) nitrogen
E) carbon dioxide
3)
4) Of the reactions below, which one is a decomposition reaction?
A) 2N2 + 3H2 → 2NH3
4)
B) NH4 Cl → NH3 + HCl
C) 2Mg + O2 → 2MgO
D) Cd(NO3 )2 + Na2 S → CdS + 2NaNO3
E) 2CH 4 + 4O2 → 2CO2 + 4H2 O
5) Which one of the following substances is the product of this combination reaction?
5)
Al (s) + I2 (s) → __________
A) Al3 I2
B) AlI3
C) Al2 I3
D) AlI
6) Which one of the following is not true concerning automotive air bags?
A) A gas is produced when the air bag activates.
B) They are loaded with sodium azide initially
C) The gas used for inflating them is oxygen
D) The two products of the decomposition reaction are sodium and nitrogen
E) They are inflated as a result of a decomposition reaction
1
E) AlI2
6)
7) The reaction used to inflate automobile airbags __________.
A) violates the law of conservation of mass
B) is a combination reaction
C) is a combustion reaction
D) is a decomposition reaction
E) produces sodium gas
7)
8) Which of the following are combination reactions?
1) CH4 (g) + O2 (g) → CO2 (g) + H2 O (l)
8)
2) CaO (s) + CO2 (g) → CaCO3 (s)
3) Mg (s) + O2 (g) → MgO (s)
4) PbCO3 (s) → PbO (s) + CO2 (g)
A) 4 only
B) 2, 3, and 4
C) 2 and 3
D) 1, 2, 3, and 4
E) 1, 2, and 3
9) Which of the following are combustion reactions?
1) CH4 (g) + O2 (g) → CO2 (g) + H2 O (l)
9)
2) CaO (s) + CO 2 (g) → CaCO3 (s)
3) PbCO3 (s) → PbO (s) + CO2 (g)
4) CH3 OH (l) + O2 (g) → CO2 (g) + H2 O (l)
A) 1 and 4
B) 1, 2, 3, and 4
C) 2, 3, and 4
D) 3 and 4
E) 1, 3, and 4
10) Which of the following are decomposition reactions?
1) CH4 (g) + O2 (g) → CO2 (g) + H2 O (l)
10)
2) CaO (s) + CO2 (g) → CaCO3 (s)
3) Mg (s) + O2 (g) → MgO (s)
4) PbCO3 (s) → PbO (s) + CO2 (g)
A) 1, 2, and 3
B) 1, 2, 3, and 4
C) 2 and 3
D) 4 only
E) 2, 3, and 4
11) The formula of nitrobenzene is C6 H5 NO2 . The molecular weight of this compound is __________
amu.
A) 3.06
B) 123.11
C) 109.10
D) 107.11
E) 43.03
12) The formula weight of potassium dichromate (K2 Cr2 O7 ) is __________ amu.
A) 242.18
B) 294.18
C) 255.08
2
D) 333.08
11)
12)
E) 107.09
13) The formula weight of potassium phosphate (K3 PO4 ) is __________ amu.
A) 196.27
B) 251.37
C) 173.17
13)
D) 212.27
E) 86.07
14) The formula weight of aluminum sulfate (Al2 (SO4 )3 ) is __________ amu.
A) 342.15
B) 59.04
C) 150.14
14)
D) 123.04
E) 273.06
15) The formula weight of silver chromate (Ag2 CrO 4 ) is __________ amu.
A) 331.73
B) 175.87
C) 339.86
15)
D) 223.87
E) 159.87
16) The formula weight of ammonium sulfate ((NH4 )2 SO4 ), rounded to the nearest integer, is
__________ amu.
A) 118
B) 100
C) 116
D) 264
E) 132
17) The molecular weight of the acetic acid (CH3 CO2 H), rounded to the nearest integer, is __________
amu.
A) 32
B) 60
C) 48
B) 30
C) 41
D) 34
B) 180
C) 24
D) 224
B) 60.0
C) 79.8
D) 30.7
B) 7.743
21)
C) 4.032
D) 25.13
E) 74.87
22) The mass % of Al in aluminum sulfate (Al2 (SO4 )3 ) is __________.
A) 7.886
B) 35.94
20)
E) 7.74
21) The mass % of H in methane (CH4 ) is __________.
A) 92.26
19)
E) 96
20) What is the mass % of carbon in dimethylsulfoxide ( C2 H6 SO) rounded to three significant figures?
A) 20.6
18)
E) 46
19) The molecular weight of glucose (C6 H12O6 ), rounded to the nearest integer, is __________ amu.
A) 136
17)
D) 44
18) The molecular weight of the ethanol (C2 H5 OH), rounded to the nearest integer, is __________
amu.
A) 92
16)
C) 21.93
D) 15.77
22)
E) 45.70
23) The formula weight of a substance is __________.
A) the sum of the atomic weights of each atom in its chemical formula
B) the same as the percent by mass weight
C) determined by combustion analysis
D) identical to the molar mass
E) the weight of a sample of the substance
23)
24) The formula weight of calcium nitrate (Ca(NO3 )2 ), rounded to one decimal place, is __________
24)
amu.
A) 164.0
B) 204.2
C) 150.1
D) 102.1
E) 116.1
25) The formula weight of magnesium fluoride (MgF2 ), rounded to one decimal place, is __________
amu.
A) 62.3
B) 43.3
C) 67.6
D) 86.6
3
E) 92.9
25)
26) The formula weight of lead nitrate (Pb(NO 3 )2 ) is __________ amu.
A) 285.2
B) 317.2
C) 538.4
26)
D) 269.2
E) 331.2
D) 74.87
E) 92.26
27) The mass % of C in methane (CH4 ) is __________.
A) 25.13
B) 7.743
27)
C) 133.6
28) The mass % of F in the binary compound KrF2 is __________.
A) 45.38
B) 31.20
C) 18.48
28)
D) 81.52
E) 68.80
29) Calculate the percentage by mass of nitrogen in PtCl2 (NH3 )2 .
A) 4.95
B) 4.67
C) 9.34
29)
D) 9.90
E) 12.67
30) Calculate the percentage by mass of lead in Pb(NO 3 )2 .
A) 71.2
B) 38.6
C) 65.3
30)
D) 62.6
E) 44.5
31) Calculate the percentage by mass of nitrogen in Pb(NO 3 )2 .
A) 10.4
B) 8.5
C) 4.2
31)
D) 12.6
E) 5.2
32) Calculate the percentage by mass of oxygen in Pb(NO 3 )2 .
A) 14.5
B) 9.7
C) 29.0
32)
D) 19.3
E) 33.4
33) Calculate the percentage by mass of chlorine in PtCl2 (NH3 )2 .
A) 18.09
B) 25.05
C) 23.63
33)
D) 11.82
E) 12.53
D) 1.558
E) 1.008
D) S8
E) Cl2
34) Calculate the percentage by mass of hydrogen in PtCl2 (NH3 )2 .
A) 0.672
B) 2.016
C) 0.034
35) One mole of __________ contains the largest number of atoms.
A) Al2 (SO4 )3
B) Na3 PO4
C) C10H8
34)
35)
36) One million argon atoms is __________ mol (rounded to two significant figures) of argon atoms.
A) 3.0
B) 6.0 × 1023
36)
C) 1.0 × 10+6
D) 1.0 × 10-6
E) 1.7 × 10-18
37) There are __________ atoms of oxygen are in 300 molecules of C H3 CO2 H.
A) 300
B) 600
C) 1.80 × 1026
D) 3.01 × 1024
E) 3.61 × 1026
4
37)
38) How many molecules of CH4 are in 48.2 g of this compound?
38)
A) 3.00
B) 5.00 × 1024
C) 1.81 × 1024
D) 2.90 × 1025
E) 4.00
39) A 30.5 gram sample of glucose (C 6 H12O6 ) contains __________ mol of glucose.
A) 5.90
B) 0.424
C) 0.169
D) 0.136
39)
E) 2.36
40) A 30.5 gram sample of glucose (C 6 H12O6 ) contains __________ atoms of carbon.
40)
A) 1.02 x 1023
B) 2.04 x 1023
C) 6.12 x 1023
D) 1.22 x 1024
E) 6.02 x 1023
41) A sample of CH2 F2 with a mass of 19 g contains __________ atoms of F.
A) 38
B) 4.4 × 1023
C) 3.3 × 1024
D) 2.2 × 1023
41)
E) 9.5
42) A sample of CH4 O with a mass of 32.0 g contains __________ molecules of C H4 O.
42)
A) 1.88 × 1022
B) 1.00
C) 6.02 × 1023
D) 5.32 × 10-23
E) 32.0
43) How many atoms of nitrogen are in 10 g of NH4 NO3 ?
A) 3.5
B) 1.8
C) 3.0 × 1023
43)
D) 1.5 × 1023
E) 2
44) Gaseous argon has a density of 1.40 g/L at standard conditions. How many argon atoms are in
1.00 L of argon gas at standard conditions?
A) 3.43 × 1025
44)
B) 1.59 × 1025
C) 4.76 × 1022
D) 2.11 × 1022
E) 6.02 × 1023
45) What is the mass in grams of 9.76 × 1012 atoms of naturally occurring sodium?
A) 1.62 × 10-11
B) 2.24 × 1014
C) 3.73 × 10-10
D) 7.05 × 10-13
E) 22.99
5
45)
46) How many moles of pyridine (C5 H5 N) are contained in 3.13 g of pyridine?
A) 0.0396
B) 0.319
D) 4.04 × 103
C) 25.3
47) How many oxygen atoms are contained in 2.74 g of Al2 (SO4 )3 ?
46)
E) 0.00404
47)
A) 12
B) 7.22 × 1024
C) 5.79 × 1022
D) 6.02 × 1023
E) 8.01 × 10-3
48) The total number of atoms in 0.111 mol of Fe(CO)3 (PH3 )2 is __________.
48)
A) 4.46 × 1021
B) 1.00 × 1024
C) 15.0
D) 1.67
E) 2.76 × 10-24
49) How many sulfur dioxide molecules are there in 1.80 mol of sulfur dioxide?
A) 6.02 × 1024
49)
B) 6.02 × 1023
C) 1.80 × 1024
D) 1.08 × 1023
E) 1.08 × 1024
50) How many sulfur dioxide molecules are there in 0.180 mol of sulfur dioxide?
A) 6.02 × 1023
50)
B) 1.80 × 1023
C) 1.08 × 1024
D) 6.02 × 1024
E) 1.08 × 1023
51) How many carbon atoms are there in 52.06 g of carbon dioxide?
A) 5.206 × 1024
51)
B) 7.122 × 1023
C) 1.424 × 1024
D) 8.648 × 10-23
E) 3.134 × 1025
52) How many oxygen atoms are there in 52.06 g of carbon dioxide?
A) 1.204 × 1024
B) 6.022 × 1023
C) 5.088 × 1023
D) 1.424 × 1024
E) 1.018 × 1024
6
52)
53) How many moles of sodium carbonate contain 1.773 × 1017 carbon atoms?
A) 9.817 × 10-8
53)
B) 8.836 × 10-7
C) 5.890 × 10-7
D) 1.473 × 10-7
E) 2.945 × 10-7
54) How many grams of sodium carbonate contain 1.773 × 1017 carbon atoms?
A) 6.066 × 10-5
54)
B) 1.011 × 10-5
C) 3.121 × 10-5
D) 9.100 × 10-5
E) 1.517 × 10-5
55) The compound responsible for the characteristic smell of garlic is allicin, C6 H10OS2 . The mass of
1.00 mol of allicin, rounded to the nearest integer, is __________ g.
A) 162
B) 19
C) 86
D) 34
E) 61
56) The molecular formula of aspartame, the generic name of NutraSweet ®, is C14H18N2 O5 . The
molar mass of aspartame, rounded to the nearest integer, is __________ g.
A) 43
B) 39
C) 294
D) 24
B) 1.8 x 10 25
C) 6.0 x 10 23
D) 1.2 x 10 24
56)
E) 156
57) There are ________ oxygen atoms in 30 molecules of C 20H42S3 O2
A) 3.6 x 10 25
55)
57)
E) 60
58) A nitrogen oxide is 63.65% by mass nitrogen. The molecular formula could be __________.
A) NO
B) NO2
58)
C) N2 O4
D) N2 O
E) either NO2 or N2 O4
59) A sulfur oxide is 50.0% by mass sulfur. This molecular formula could be __________.
A) S2 O4
59)
B) SO2
C) SO
D) S2 O
E) either SO2 or S2 O4
60) Which hydrocarbon pair below have identical mass percentage of C?
A) C3 H4 and C3 H6
B) C2 H4 and C3 H4
C) C2 H4 and C3 H6
D) C2 H4 and C4 H2
E) none of the above
7
60)
61) Sulfur and oxygen react to produce sulfur trioxide. In a particular experiment, 7.9 grams of SO 3
61)
are produced by the reaction of 5.0 grams of O 2 with 6.0 grams of S. What is the % yield of SO3 in
this experiment?
S (s) + O2 (g) → SO3 (g) (not balanced)
A) 99
B) 63
C) 95
D) 32
E) 75
62) What are the spectator ions in the reaction between KOH (aq) and HN O3 (aq)?
62)
A) K+ and H+
B) H+ and NO 3 C) OH- only
D) K+ and NO 3 E) H+ and OH63) The net ionic equation for the reaction between aqueous solutions of HF and KOH is __________.
A) HF + K+ + OH- → H2 O + KF
63)
B) H+ + OH- → H2 O
C) HF + KOH → H2 O + K+ + FD) HF + OH- → H2 O + FE) H+ + F- + K+ + OH- → H2 O + K+ + F64) Combining aqueous solutions of BaI2 and Na2 SO4 affords a precipitate of BaSO4 . Which ion(s)
64)
is/are spectator ions in the reaction?
A) Ba 2+ and SO4 2B) Na+ and IC) Na+ only
D) Ba 2+ only
E) SO4 2- and I65) Which ion(s) is/are spectator ions in the formation of a precipitate of AgCl via combining aqueous
solutions of CoCl2 and AgNO3 ?
A) NO3 B) ClC) Co2+ and Ag+
D) Co2+ and NO3 E) NO3 - and Cl-
8
65)
66) The balanced net ionic equation for precipitation of CaCO3 when aqueous solutions of Na2 CO3
66)
and CaCl2 are mixed is __________.
A) 2Na+ (aq) + CO3 2- (aq) → Na2 CO3 (aq)
B) Ca2+ (aq) + CO 3 2- (aq) → CaCO3 (s)
C) Na2 CO3 (aq) + CaCl2 (aq) → 2NaCl (aq) + CaCO3 (s)
D) Na+ (aq) + Cl- (aq) → NaCl (aq)
E) 2Na+ (aq) + 2Cl- (aq) → 2NaCl (aq)
67) When aqueous solutions of AgNO3 and KI are mixed, AgI precipitates. The balanced net ionic
67)
equation is __________.
A) Ag+ (aq) + NO3 - (aq) → AgNO3 (aq)
B) Ag+ (aq) + NO3 - (aq) → AgNO3 (s)
C) AgNO3 (aq) + KI (aq) → AgI (aq) + KNO3 (s)
D) AgNO3 (aq) + KI (aq) → AgI (s) + KNO3 (aq)
E) Ag+ (aq) + I- (aq) → AgI (s)
68) When H2 SO4 is neutralized by NaOH in aqueous solution, the net ionic equation is __________.
68)
A) H+ (aq) + OH- (aq) → H2 O (l)
B) SO4 2- (aq) + 2Na+ (aq) → Na2 SO4 (s)
C) SO4 2- (aq) + 2Na+ (aq) → Na2 SO4 (aq)
D) 2H+ (aq) + 2NaOH (aq) → 2H2 O (l) + 2Na+ (aq)
E) H2 SO4 (aq) + 2OH- (aq) → 2H2 O (l) + SO4 2- (aq)
69) The spectator ions in the reaction between aqueous perchloric acid and aqueous barium hydroxide
are __________.
A) ClO4 - and Ba 2+
69)
B) OH- and ClO4 C) H+ and Ba 2+
D) H+ , OH- , ClO4 - , and Ba 2+
E) H+ and OH70) The spectator ions in the reaction between aqueous hydrofluoric acid and aqueous barium
hydroxide are __________.
A) H+, OH- , F- , and Ba 2+
B) F- and Ba 2+
C) OH- and FD) Ba 2+ only
E) OH- , F- , and Ba 2+
9
70)
71) The spectator ions in the reaction between aqueous hydrochloric acid and aqueous ammonia are
__________.
A) H+ , Cl- , and NH4 +
71)
B) H+ , Cl- , NH3 , and NH4 +
C) Cl- and NH4 +
D) Cl- only
E) H+ and NH3
72) Propane (C3 H8 ) reacts with oxygen in the air to produce carbon dioxide and water. In a particular
experiment, 38.0 grams of carbon dioxide are produced from the reaction of 22.05 grams of
propane with excess oxygen. What is the % yield in this reaction?
A) 38.0
B) 57.6
C) 94.5
D) 86.4
E) 66.0
10
72)
Answer Key
Testname: UNTITLED5
1) E
2) B
3) C
4) B
5) B
6) C
7) D
8) C
9) A
10) D
11) B
12) B
13) D
14) A
15) A
16) E
17) B
18) E
19) B
20) D
21) D
22) D
23) A
24) A
25) A
26) E
27) D
28) B
29) C
30) D
31) B
32) C
33) C
34) B
35) C
36) E
37) B
38) C
39) C
40) C
41) B
42) C
43) D
44) D
45) C
46) A
47) C
48) B
49) E
50) E
11
Answer Key
Testname: UNTITLED5
51) B
52) D
53) E
54) C
55) A
56) C
57) E
58) D
59) E
60) C
61) C
62) D
63) D
64) B
65) D
66) B
67) E
68) A
69) A
70) D
71) D
72) B
12