Question 1

How many sodium ions are present in 325 mL of 0.850 M Na2SO4?

Accepted Answer

A)  5.12 × 1023 Na ions 
B)  8.32 × 1022 Na ions 
C)  1.02 × 1024 Na ions 
D)  1.66 × 1023 Na ions 
E)  3.33 × 1023 Na ions 
A)  5.12 × 1023 Na ions 
B)  8.32 × 1022 Na ions 
C)  1.02 × 1024 Na ions 
D)  1.66 × 1023 Na ions 
E)  3.33 × 1023 Na ions

Question 2

Zinc dissolves in hydrochloric acid to yield hydrogen gas as follows: Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g)
What mass of hydrogen gas is produced when a 7.35-g sample of zinc dissolves in 500.mL of 1.200 M HCl?

Accepted Answer

A)  0.605 g 
B)  0.113 g 
C)  0.302 g 
D)  0.453 g 
E)  0.227 g 
A)  0.605 g 
B)  0.113 g 
C)  0.302 g 
D)  0.453 g 
E)  0.227 g

Question 3

Which statement is false concerning oxidation numbers?

Accepted Answer

A)  An element's oxidation number is constant and unchanging. 
B)  Atoms of free elements have an oxidation number of zero. 
C)  An atom's oxidation state signifies the number of charges for that atom in a molecule. 
D)  Oxidation numbers allow easy identification of which atoms gained or lost electrons. 
A)  An element's oxidation number is constant and unchanging. 
B)  Atoms of free elements have an oxidation number of zero. 
C)  An atom's oxidation state signifies the number of charges for that atom in a molecule. 
D)  Oxidation numbers allow easy identification of which atoms gained or lost electrons.

Question 4

How many moles of H+(aq) ions are present in 750 mL of 0.65 M hydrochloric acid?

Accepted Answer

A)  1.2 mol 
B)  0.98 mol 
C)  0.87 mol 
D)  0.65 mol 
E)  0.49 mol 
A)  1.2 mol 
B)  0.98 mol 
C)  0.87 mol 
D)  0.65 mol 
E)  0.49 mol

Question 5

The oxidation number for oxygen in O2 is zero.

Accepted Answer

A) True 
 B)False

Question 6

In the reaction 5H2O2 + 2MnO4- + 6H+ → 2Mn2+ + 8H2O + 5O2, what is the oxidizing agent?

Accepted Answer

A)  H2O2 
B)  MnO4- 
C)  H+ 
D)  Mn2+ 
E)  O2 
A)  H2O2 
B)  MnO4- 
C)  H+ 
D)  Mn2+ 
E)  O2

Question 7

________ ________ is a highly accurate analytical technique which is quantitative and based on the measurement of mass.

Accepted Answer

Gravimetri

Question 8

Select the compound in which sulfur has its highest possible oxidation number.

Accepted Answer

A)  H2S 
B)  SO2 
C)  SCl2 
D)  H2SO3 
E)  Na2SO4 
A)  H2S 
B)  SO2 
C)  SCl2 
D)  H2SO3 
E)  Na2SO4

Question 9

What is the oxidation number of Cr in Cr2O72-?

Accepted Answer

A)  -12 
B)  -7 
C)  -2 
D)  +6 
E)  +7 
A)  -12 
B)  -7 
C)  -2 
D)  +6 
E)  +7

Question 10

Which of these chemical equations describes a disproportionation reaction?

Accepted Answer

A)  2C2H6(g) + 7O2(g) → 4CO2(g) + 6H2O(l) 
B)  2KBr(aq) + Cl2(g) → 2KCl(aq) + Br2(l) 
C)  2H2O2(aq) → 2H2O(l) + O2(g) 
D)  CaBr2(aq) + H2SO4(aq) → CaSO4(s) + 2HBr(g) 
E)  2Al(s) + 3H2SO4(aq) → Al2(SO4)3(aq) + 3H2(g) 
A)  2C2H6(g) + 7O2(g) → 4CO2(g) + 6H2O(l) 
B)  2KBr(aq) + Cl2(g) → 2KCl(aq) + Br2(l) 
C)  2H2O2(aq) → 2H2O(l) + O2(g) 
D)  CaBr2(aq) + H2SO4(aq) → CaSO4(s) + 2HBr(g) 
E)  2Al(s) + 3H2SO4(aq) → Al2(SO4)3(aq) + 3H2(g)

Question 11

What is the oxidation number of oxygen in KMnO4?

Accepted Answer

A)  +1 
B)  -8 
C)  +5 
D)  -2 
E)  +3 
A)  +1 
B)  -8 
C)  +5 
D)  -2 
E)  +3

Question 12

Which of these compounds is a weak electrolyte?

Accepted Answer

A)  HCl 
B)  CH3COOH (acetic acid) 
C)  C6H12O6 (glucose) 
D)  O2 
E)  NaCl 
A)  HCl 
B)  CH3COOH (acetic acid) 
C)  C6H12O6 (glucose) 
D)  O2 
E)  NaCl

Question 13

Which is defined as the maximum amount of solute that will dissolve in a given quantity of solvent at a specific temperature?

Accepted Answer

A)  precipitation 
B)  combustion 
C)  solubility 
D)  super saturation 
E)  dilution 
A)  precipitation 
B)  combustion 
C)  solubility 
D)  super saturation 
E)  dilution

Question 14

What is the oxidation number of N in N2H4?

Accepted Answer

A)  +4 
B)  +2 
C)  -2 
D)  -4 
E)  0 
A)  +4 
B)  +2 
C)  -2 
D)  -4 
E)  0

Question 15

Which of these chemical equations describes a metal displacement reaction?

Accepted Answer

A)  2NaN3(s) → 2Na(s) + 3N2(g) 
B)  Fe2O3(s) + 2Al(s) → 2Fe(s) + Al2O3(s) 
C)  3NO2(g) + H2O(l) → 2HNO3(aq) + NO(g) 
D)  2P(s) + 3Cl2(g) → 2PCl3(g) 
E)  2ZnS(s) + 3O2(g) → 2ZnO(s) + 2SO2(g) 
A)  2NaN3(s) → 2Na(s) + 3N2(g) 
B)  Fe2O3(s) + 2Al(s) → 2Fe(s) + Al2O3(s) 
C)  3NO2(g) + H2O(l) → 2HNO3(aq) + NO(g) 
D)  2P(s) + 3Cl2(g) → 2PCl3(g) 
E)  2ZnS(s) + 3O2(g) → 2ZnO(s) + 2SO2(g)

Question 16

Which equation describes a redox reaction?

Accepted Answer

A)  2Al(s) + 3H2SO4(aq) → Al2(SO4)3(aq) + 3H2(g) 
B)  2KBr(aq) + Pb(NO3)2(aq) → 2KNO3(aq) + PbBr2(s) 
C)  CaBr2(aq) + H2SO4(aq) → CaSO4(s) + 2HBr(aq) 
D)  H+(aq) + OH-(aq) → H2O(l) 
E)  CO32-(aq) + HSO4-(aq) → HCO3-(aq) + SO42-(aq) 
A)  2Al(s) + 3H2SO4(aq) → Al2(SO4)3(aq) + 3H2(g) 
B)  2KBr(aq) + Pb(NO3)2(aq) → 2KNO3(aq) + PbBr2(s) 
C)  CaBr2(aq) + H2SO4(aq) → CaSO4(s) + 2HBr(aq) 
D)  H+(aq) + OH-(aq) → H2O(l) 
E)  CO32-(aq) + HSO4-(aq) → HCO3-(aq) + SO42-(aq)

Question 17

Phenolphthalein is a universal indicator and maybe used as an indicator for all acid-base titrations.

Accepted Answer

A) True 
 B)False

Question 18

The distinguishing characteristic of all electrolyte solutions is that they

Accepted Answer

A)  contain molecules. 
B)  conduct electricity. 
C)  react with other solutions. 
D)  always contain acids. 
E)  conduct heat. 
A)  contain molecules. 
B)  conduct electricity. 
C)  react with other solutions. 
D)  always contain acids. 
E)  conduct heat.

Question 19

Which process defines how molecular compounds form ions upon dissolution?

Accepted Answer

A)  ionization 
B)  composition 
C)  division 
D)  dissolution 
E)  decomposition 
A)  ionization 
B)  composition 
C)  division 
D)  dissolution 
E)  decomposition

Question 20

If aqueous solutions of Pb(NO3)2 and NaCl are mixed, which ions, if any, are spectator ions? Pb(NO3)2(aq) + 2NaCl(aq) → PbCl2(s) + 2NaNO3(aq)

Accepted Answer

A)  Pb2+(aq), Cl-(aq) 
B)  Na+(aq), NO3- (aq) 
C)  Pb2+(aq), NO3-(aq) 
D)  Na+(aq), Cl-(aq) 
E)  None are spectator ions. 
A)  Pb2+(aq), Cl-(aq) 
B)  Na+(aq), NO3- (aq) 
C)  Pb2+(aq), NO3-(aq) 
D)  Na+(aq), Cl-(aq) 
E)  None are spectator ions.

Exam 4: Reactions in Aqueous Solutions

How many sodium ions are present in 325 mL of 0.850 M Na2SO4?

Zinc dissolves in hydrochloric acid to yield hydrogen gas as follows: Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g) What mass of hydrogen gas is produced when a 7.35-g sample of zinc dissolves in 500.mL of 1.200 M HCl?

Which statement is false concerning oxidation numbers?

How many moles of H+(aq) ions are present in 750 mL of 0.65 M hydrochloric acid?

The oxidation number for oxygen in O2 is zero.

In the reaction 5H2O2 + 2MnO4- + 6H+ → 2Mn2+ + 8H2O + 5O2, what is the oxidizing agent?

________ ________ is a highly accurate analytical technique which is quantitative and based on the measurement of mass.

Select the compound in which sulfur has its highest possible oxidation number.

What is the oxidation number of Cr in Cr2O72-?

Which of these chemical equations describes a disproportionation reaction?

What is the oxidation number of oxygen in KMnO4?

Which of these compounds is a weak electrolyte?

Which is defined as the maximum amount of solute that will dissolve in a given quantity of solvent at a specific temperature?

What is the oxidation number of N in N2H4?

Which of these chemical equations describes a metal displacement reaction?

Which equation describes a redox reaction?

Phenolphthalein is a universal indicator and maybe used as an indicator for all acid-base titrations.

The distinguishing characteristic of all electrolyte solutions is that they

Which process defines how molecular compounds form ions upon dissolution?

If aqueous solutions of Pb(NO3)2 and NaCl are mixed, which ions, if any, are spectator ions? Pb(NO3)2(aq) + 2NaCl(aq) → PbCl2(s) + 2NaNO3(aq)

Chemistry: the Central Science

Atoms, Molecules, and Ions

Stoichiometry: Ratios of Combination

Thermochemistry

Quantum Theory and the Electronic Structure of Atoms

Electron Configuration and the Periodic Table

Chemical Bonding I: Basic Concepts

Chemical Bonding II: Molecular Geometry and Bonding Theories

Gases

Intermolecular Forces and the Physical Properties of Liquids and Solids

Modern Materials

Physical Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Entropy, Free Energy, and Equilibrium

Electrochemistry

Nuclear Chemistry

Environmental Chemistry

Coordination Chemistry

Metallurgy and the Chemistry of Metals

Nonmetallic Elements and Their Compounds

Organic Chemistry

Filters

How many sodium ions are present in 325 mL of 0.850 M Na₂SO₄?

Zinc dissolves in hydrochloric acid to yield hydrogen gas as follows: Zn(s) + 2HCl(aq) → ZnCl₂(aq) + H₂(g) What mass of hydrogen gas is produced when a 7.35-g sample of zinc dissolves in 500.mL of 1.200 M HCl?

How many moles of H⁺(aq) ions are present in 750 mL of 0.65 M hydrochloric acid?

The oxidation number for oxygen in O₂ is zero.

In the reaction 5H₂O₂ + 2MnO₄^-+ 6H⁺→ 2Mn²⁺ + 8H₂O + 5O₂, what is the oxidizing agent?

is a highly accurate analytical technique which is quantitative and based on the measurement of mass.

What is the oxidation number of Cr in Cr₂O₇^2-?

What is the oxidation number of oxygen in KMnO₄?

What is the oxidation number of N in N₂H₄?

If aqueous solutions of Pb(NO₃)₂ and NaCl are mixed, which ions, if any, are spectator ions? Pb(NO₃)₂(aq) + 2NaCl(aq) → PbCl₂(s) + 2NaNO₃(aq)