Chemistry: A Molecular Approach, 4e (Tro)
Chapter 3 Molecules, Compounds, and Chemical Equations
Multiple Choice Questions
1) An ionic bond is best described as
A) the sharing of electrons.
B) the transfer of electrons from one atom to another.
C) the attraction that holds the atoms together in a polyatomic ion.
D) the attraction between two nonmetal atoms.
E) the attraction between two metal atoms.
Answer: B
Diff: 1 Var: 1 Page Ref: 3.2
Global: G1
2) A covalent bond is best described as
A) the sharing of electrons between atoms.
B) the transfer of electrons.
C) a bond between a metal and a nonmetal.
D) a bond between a metal and a polyatomic ion.
E) a bond between two polyatomic ions.
Answer: A
Diff: 1 Var: 1 Page Ref: 3.2
Global: G1
3) Give a possible molecular formula for the empirical formula of C3H5ClO.
A) C6H10ClO2
B) C5H10Cl2O2
C) C6H10Cl2O2
D) C6H10O2
E) C6H12Cl2O2
Answer: C
Diff: 2 Var: 1 Page Ref: 3.3
LO: 3.1
Global: G2
4) What is the empirical formula for Hg2(NO3)2?
A) Hg2(NO3)2
B) HgNO3
C) Hg(NO3)2
D) Hg2NO3
E) Hg4(NO3)4
Answer: B
Diff: 2 Var: 1 Page Ref: 3.3
LO: 3.1
Global: G2
5) Give the name for SnO.
A) tin(I) oxide
B) tin(II) oxide
C) tin(III) oxide
D) tin(IV) oxide
Answer: B
Diff: 2 Var: 1 Page Ref: 3.5
LO: 3.4
Global: G2
6) Give the name for TiCO3. Remember that titanium forms several ions.
A) titanium(II) carbonate
B) titanium carbide
C) titanium carbonite
D) titanium(II) carbonite
E) titanium(I) carbonate
Answer: A
Diff: 2 Var: 1 Page Ref: 3.5
LO: 3.5
Global: G2
7) Write the name for Sn(SO4)2. Remember that Sn forms several ions.
A) tin(I) sulfite
B) tin(IV) sulfate
C) tin sulfide
D) tin(II) sulfite
E) tin(I) sulfate
Answer: B
Diff: 2 Var: 1 Page Ref: 3.5
LO: 3.5
Global: G2
8) Give the name for KMnO4.
A) potassium manganese tetraoxide
B) potassium manganate
C) potassium permanganate
D) potassium permagnesium
E) potassium magnesate
Answer: C
Diff: 2 Var: 1 Page Ref: 3.5
LO: 3.5
Global: G2
9) Give the name for CoCl2∙6H2O. Remember that Co forms several ions.
A) cobalt chloride hydrate
B) cobalt(I) chloride heptahydrate
C) cobalt(II) chloride heptahydrate
D) cobalt(II) chloride hexahydrate
E) cobalt(I) chloride
Answer: D
Diff: 2 Var: 1 Page Ref: 3.5
LO: 3.4
Global: G2
10) Give the correct formula for aluminum sulfate.
A) Al2SO4
B) Al(SO4)3
C) Al3(SO4)2
D) Al2(SO4)3
Answer: D
Diff: 3 Var: 1 Page Ref: 3.5
LO: 3.3
Global: G2
11) Write the formula for copper (II) sulfate pentahydrate.
A) Cu2SO3∙H5
B) Cu2S∙H2O
C) CuS∙5H2O
D) (CuSO4)5
E) CuSO4∙5H2O
Answer: E
Diff: 3 Var: 1 Page Ref: 3.5
LO: 3.3
Global: G2
12) Give the name for H2CO3.
A) carbonous acid
B) dihydrogen carbonate
C) carbonic acid
D) hydrocarbonic acid
E) hydrocarbide acid
Answer: C
Diff: 2 Var: 1 Page Ref: 3.6
LO: 3.7
Global: G2
13) Give the formula for sulfurous acid.
A) H2SO3
B) HSO3
C) H2SO4
D) HSO4
Answer: A
Diff: 2 Var: 1 Page Ref: 3.6
LO: 3.7
Global: G2
14) Give the name for H2SO4.
A) sulfuric acid
B) persulfurous acid
C) sulfurous acid
D) hyposulfurous acid
E) persulfuric acid
Answer: A
Diff: 2 Var: 1 Page Ref: 3.6
LO: 3.7
Global: G2
15) Give the name for HNO3.
A) nitric acid
B) nitrous acid
C) hydrogen nitrate
D) hydrogen nitrite
E) hydrogen nitride
Answer: A
Diff: 2 Var: 1 Page Ref: 3.6
LO: 3.7
Global: G2
16) Give the name for P4O10.
A) phosphorus(IV) oxide
B) diphosphorus pentoxide
C) phosphorus oxide
D) phosphorus(II) oxide
E) tetraphosphorus decoxide
Answer: E
Diff: 2 Var: 1 Page Ref: 3.6
LO: 3.8
Global: G2
17) Identify the FALSE statement about acid rain.
A) Acid rain contains nitric acid and sulfuric acid.
B) Acid rain dissolves marble statues.
C) Acid rain comes from coal-powered electric power plants.
D) Acid rain corrodes steel bridges.
E) Acid rain comes from hydroelectric power plants.
Answer: E
Diff: 2 Var: 1 Page Ref: 3.6
Global: G2
18) Calculate the molar mass of Al(C2H3O2)3.
A) 86.03 g/mol
B) 204.13 g/mol
C) 56.00 g/mol
D) 258.09 g/mol
E) 139.99 g/mol
Answer: B
Diff: 2 Var: 1 Page Ref: 3.8
LO: 3.9
Global: G4
19) Calculate the molar mass of Ca3(PO4)2.
A) 87.05 g/mol
B) 215.21 g/mol
C) 310.18 g/mol
D) 279.21 g/mol
E) 246.18 g/mol
Answer: C
Diff: 2 Var: 1 Page Ref: 3.8
LO: 3.9
Global: G4
20) Calculate the molar mass of H2CO3.
A) 62.03 g/mol
B) 29.02 g/mol
C) 61.02 g/mol
D) 60.01 g/mol
E) 74.04 g/mol
Answer: A
Diff: 2 Var: 1 Page Ref: 3.8
LO: 3.9
Global: G4
21) The molecular weight of urea ((NH2)2CO), a compound used as a nitrogen fertilizer, is ______amu (rounded to one decimal place).
A) 44.0
B) 43.0
C) 60.1
D) 8.0
E) 32.0
Answer: C
Diff: 2 Var: 1 Page Ref: 3.8
LO: 3.9
Global: G4|G5
22) How many millimoles of Ca(NO3)2 contain 4.78 × 1022 formula units of Ca(NO3)2? The molar mass of Ca(NO3)2 is 164.10 g/mol.
A) 12.6 mmol Ca(NO3)2
B) 13.0 mmol Ca(NO3)2
C) 20.7 mmol Ca(NO3)2
D) 79.4 mmol Ca(NO3)2
E) 57.0 mmol Ca(NO3)2
Answer: D
Diff: 2 Var: 1 Page Ref: 3.8
LO: 3.10
Global: G4
23) How many molecules of N2O4 are in 76.3 g N2O4? The molar mass of N2O4 is 92.02 g/mol.
A) 5.54 × 1025 N2O4 molecules
B) 7.26 × 1023 N2O4 molecules
C) 1.38 × 1024 N2O4 molecules
D) 4.59 × 1025 N2O4 molecules
E) 4.99 × 1023 N2O4 molecules
Answer: E
Diff: 3 Var: 1 Page Ref: 3.8
LO: 3.10
Global: G4
24) How many moles of N2O4 are in 76.3 g N2O4? The molar mass of N2O4 is 92.02 g/mol.
A) 7.02 × 103 moles
B) 1.42 × 10-4 moles
C) 1.00 mole
D) 1.21 moles
E) 0.829 moles
Answer: E
Diff: 3 Var: 1 Page Ref: 3.8
LO: 3.10
Global: G4
25) How many C2H4 molecules are contained in 45.8 mg of C2H4? The molar mass of C2H4 is 28.05 g/mol.
A) 9.83 × 1020 C2H4 molecules
B) 7.74 × 1026 C2H4 molecules
C) 2.71 × 1020 C2H4 molecules
D) 3.69 × 1023 C2H4 molecules
E) 4.69 × 1023 C2H4 molecules
Answer: A
Diff: 3 Var: 1 Page Ref: 3.8
LO: 3.10
Global: G4
26) What is the mass (in kg) of 6.89 × 1025 molecules of CO2? The molar mass of CO2 is 44.01 g/mol.
A) 3.85 kg
B) 5.04 kg
C) 2.60 kg
D) 3.03 kg
E) 6.39 kg
Answer: B
Diff: 3 Var: 1 Page Ref: 3.8
LO: 3.10
Global: G4
27) Determine the number of moles of sodium in 3.20 moles of sodium hydrogen phosphate.
A) 6.40 moles of sodium
B) 3.20 moles of sodium
C) 9.60 moles of sodium
D) 1.60 moles of sodium
E) 12.80 moles of sodium
Answer: A
Diff: 3 Var: 1 Page Ref: 3.8
Global: G4
28) Determine the number of moles of oxygen in 3.20 moles of sodium hydrogen phosphate.
A) 6.40 moles of oxygen
B) 3.20 moles of oxygen
C) 9.60 moles of oxygen
D) 1.60 moles of oxygen
E) 12.80 moles of oxygen
Answer: E
Diff: 3 Var: 1 Page Ref: 3.8
Global: G4
29) Calculate the mass percent composition of sulfur in Al2(SO4)3.
A) 28.12%
B) 9.372%
C) 42.73%
D) 21.38%
E) 35.97%
Answer: A
Diff: 2 Var: 1 Page Ref: 3.9
LO: 3.11
Global: G4
30) Calculate the mass percent composition of lithium in Li3PO4.
A) 26.75%
B) 17.98%
C) 30.72%
D) 55.27%
E) 20.82%
Answer: B
Diff: 2 Var: 1 Page Ref: 3.9
LO: 3.11
Global: G4
31) How many atoms of oxygen are contained in 47.6 g of Al2(CO3)3? The molar mass of Al2(CO3)3 is 233.99 g/mol.
A) 1.23 × 1023 O atoms
B) 2.96 × 1024 O atoms
C) 2.87 × 1025 O atoms
D) 1.10 × 1024 O atoms
E) 3.68 × 1023 O atoms
Answer: D
Diff: 4 Var: 1 Page Ref: 3.9
LO: 3.12
Global: G4
32) How many atoms of carbon are contained in 47.6 g of Al2(CO3)3? The molar mass of Al2(CO3)3 is 233.99 g/mol.
A) 1.23 × 1023 C atoms
B) 2.96 × 1024 C atoms
C) 2.87 × 1025 C atoms
D) 1.10 × 1024 C atoms
E) 3.68 × 1023 C atoms
Answer: E
Diff: 4 Var: 1 Page Ref: 3.9
LO: 3.12
Global: G4
33) How many sodium ions are contained in 99.6 mg of Na2SO3? The molar mass of Na2SO3 is 126.05 g/mol.
A) 1.52 × 1027 sodium ions
B) 4.76 × 1020 sodium ions
C) 2.10 × 1021 sodium ions
D) 1.05 × 1021 sodium ions
E) 9.52 × 1020 sodium ions
Answer: E
Diff: 4 Var: 1 Page Ref: 3.9
LO: 3.12
Global: G4
34) How many SO32- ions are contained in 99.6 mg of Na2SO3? The molar mass of Na2SO3 is 126.05 g/mol.
A) 1.52 × 1027 SO3 ions
B) 4.76 × 1020 SO3 ions
C) 2.10 × 1021 SO3 ions
D) 1.05 × 1021 SO3 ions
E) 9.52 × 1020 SO3 ions
Answer: B
Diff: 4 Var: 1 Page Ref: 3.9
LO: 3.12
Global: G4
35) Determine the volume of hexane that contains 5.33 × 1022 molecules of hexane. The density of hexane is 0.6548 g/mL and its molar mass is 86.17 g/mol.
A) 8.59 mL
B) 13.5 mL
C) 7.40 mL
D) 12.4 mL
E) 11.6 mL
Answer: E
Diff: 4 Var: 1 Page Ref: 3.9
LO: 3.10
Global: G4
36) How many molecules of butane are contained in 25.0 mL of butane? The density of butane is 0.6011 g/mL and the molar mass is 58.12 g/mol.
A) 2.59 × 1023 molecules butane
B) 1.46 × 1027 molecules butane
C) 6.87 × 1023 molecules butane
D) 1.56 × 1023 molecules butane
E) 7.14 × 1025 molecules butane
Answer: D
Diff: 4 Var: 1 Page Ref: 3.9
LO: 3.10
Global: G4
37) Determine the molecular formula of a compound that has a molar mass of 183.2 g/mol and an empirical formula of C2H5O2.
A) C2H5O2
B) C6H15O6
C) C3H7O3
D) C4H10O4
E) C8H20O8
Answer: B
Diff: 2 Var: 1 Page Ref: 3.10
LO: 3.15
Global: G4
38) Determine the molecular formula of a compound that has a molar mass of 92.0 g/mol and an empirical formula of NO2.
A) N2O3
B) N3O6
C) N2O4
D) NO2
E) N2O5
Answer: C
Diff: 2 Var: 1 Page Ref: 3.10
LO: 3.15
Global: G4
39) Determine the empirical formula for a compound that is 36.86% N and 63.14% O by mass.
A) NO
B) N2O
C) NO2
D) N2O3
E) NO3
Answer: D
Diff: 3 Var: 1 Page Ref: 3.10
LO: 3.14
Global: G4
40) Determine the empirical formula for a compound that is found to contain 10.15 mg P and 34.85 mg Cl.
A) P3Cl
B) PCl
C) PCl2
D) P2Cl3
E) PCl3
Answer: E
Diff: 3 Var: 1 Page Ref: 3.10
LO: 3.14
Global: G4
41) Determine the empirical formula for a compound that contains C, H and O. It contains 52.14% C and 34.73% O by mass.
A) C2H6O
B) CHO
C) C4H13O2
D) CH4O3
E) CH3O
Answer: A
Diff: 3 Var: 1 Page Ref: 3.10
LO: 3.14
Global: G4
42) Determine the empirical formula for a compound that is 70.79% carbon, 8.91% hydrogen, 4.59% nitrogen, and 15.72% oxygen.
A) C18H27NO3
B) C18H27NO2
C) C17H27NO3
D) C17H26NO3
Answer: A
Diff: 5 Var: 1 Page Ref: 3.10
LO: 3.14
Global: G4
43) Determine the molecular formula of a compound that is 49.48% carbon, 5.19% hydrogen, 28.85% nitrogen, and 16.48% oxygen. The molecular weight is 194.19 g/mol.
A) C8H12N4O2
B) C4H5N2O
C) C8H10N4O2
D) C8H10N2O
Answer: C
Diff: 5 Var: 1 Page Ref: 3.10
LO: 3.15
Global: G4
44) Combustion analysis of 63.8 mg of a C, H and O containing compound produced 145.0 mg of CO2 and 59.38 mg of H2O. What is the empirical formula for the compound?
A) C5H2O
B) CHO
C) C3H6O
D) C3H7O
E) C6HO3
Answer: C
Diff: 5 Var: 1 Page Ref: 3.10
LO: 3.16
Global: G4
45) Write a balanced equation to show the reaction of sulfurous acid with lithium hydroxide to form water and lithium sulfite.
A) H2SO4(aq) + LiOH(aq) → H2O(l) + Li2SO4(aq)
B) H2SO3(aq) + 2 LiOH(aq) → 2 H2O(l) + Li2SO3(aq)
C) HSO3(aq) + LiOH(aq) → H2O(l) + LiSO3(aq)
D) HSO4(aq) + LiOH(aq) → H2O(l) + LiSO4(aq)
E) H2S(aq) + 2 LiOH(aq) → 2 H2O(l) + Li2S(aq)
Answer: B
Diff: 3 Var: 1 Page Ref: 3.11
LO: 3.17
Global: G4
46) Write a balanced equation to show the reaction of gaseous ethane with gaseous oxygen to form carbon monoxide gas and water vapor.
A) 2 C2H6(g) + 7 O2(g) → 4 CO2(g) + 6 H2O(g)
B) C2H6(g) + 5 O(g) → 2 CO(g) + 3 H2O(g)
C) 2 C2H6(g) + 5 O2(g) → 4 CO(g) + 6 H2O(g)
D) C2H6(g) + 7 O(g) → 2 CO2(g) + 3 H2O(g)
E) 2 CH3(g) + 5 O(g) → 2 CO(g) + 3 H2O(g)
Answer: C
Diff: 3 Var: 1 Page Ref: 3.11
LO: 3.17
Global: G4
47) Write a balanced equation to show the reaction of aqueous aluminum acetate with aqueous ammonium phosphate to form solid aluminum phosphate and aqueous ammonium acetate.