Question 1

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.F) A) and B)
G) None of the above

Question 2

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

Accepted Answer

A)   H2S
B)   SO2
C)   SCl2
D)   H2SO3
E)   Na2SO4F) A) and C)
G) All of the above

Question 3

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 ionsF) None of the above
G) C) and E)

Question 4

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.E) All of the above
F) B) and C)

Question 5

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) F) None of the above
G) A) and E)

Question 6

Which process defines how molecular compounds form ions upon dissolution?

Accepted Answer

A)   ionization
B)   composition
C)   division
D)   dissolution
E)   decompositionF) A) and B)
G) A) and C)

Question 7

What is the oxidation number of Cr in Cr2O72-?

Accepted Answer

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

Question 8

The oxidation number for oxygen in O2 is zero.

Accepted Answer

A) True 
 B)False

Question 9

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

Accepted Answer

Gravimetri...

Question 10

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 gF) B) and C)
G) A) and B)

Question 11

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.F) All of the above
G) D) and E)

Question 12

Which of these compounds is a weak electrolyte?

Accepted Answer

A)   HCl
B)   CH3COOH (acetic acid) 
C)   C6H12O6 (glucose) 
D)   O2
E)   NaClF) A) and C)
G) A) and B)

Question 13

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) F) C) and D)
G) A) and C)

Question 14

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)   dilutionF) A) and C)
G) C) and E)

Question 15

What is the oxidation number of oxygen in KMnO4?

Accepted Answer

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

Question 16

What is the oxidation number of N in N2H4?

Accepted Answer

A)   +4
B)   +2
C)   -2
D)   -4
E)   0F) A) and C)
G) All of the above

Question 17

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 molF) A) and B)
G) All of the above

Question 18

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) F) A) and D)
G) None of the above

Question 19

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

Accepted Answer

A) True 
 B)False

Question 20

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)   O2F) A) and D)
G) B) and D)

Exam 4: Reactions in Aqueous Solutions

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

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Which statement is false concerning oxidation numbers?

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Which process defines how molecular compounds form ions upon dissolution?

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Which equation describes a redox reaction?

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Which of these chemical equations describes a disproportionation reaction?

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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)

Correct AnswerverifiedShow Answer

Which of these compounds is a weak electrolyte?

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

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What is the oxidation number of oxygen in KMnO4?

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

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

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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?

Correct AnswerverifiedShow Answer

What is the oxidation number of N in N2H4?

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The oxidation number for oxygen in O2 is zero.

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

Correct AnswerverifiedGravimetri...View AnswerShow Answer

What is the oxidation number of Cr in Cr2O72-?

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

Correct AnswerverifiedShow Answer

The distinguishing characteristic of all electrolyte solutions is that they

Correct AnswerverifiedShow Answer

Which of these chemical equations describes a metal displacement reaction?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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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)

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What is the oxidation number of oxygen in KMnO₄?

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

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

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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?

Correct Answer
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What is the oxidation number of N in N₂H₄?

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The oxidation number for oxygen in O₂ is zero.

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

Correct Answer
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Gravimetri...
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What is the oxidation number of Cr in Cr₂O₇^2-?

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

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