Question 1

Balance the following redox reaction if it occurs in basic solution.What are the coefficients in front of ClO2 and H2O in the balanced reaction? 
H2O2(l) + ClO2(aq) → ClO2⁻(aq) + O2(g)

Accepted Answer

A)  ClO2 = 1,H2O = 1
B)  ClO2 = 1,H2O = 2
C)  ClO2 = 4,H2O = 3
D)  ClO2 = 4,H2O = 2
E)  ClO2 = 2,H2O = 2F) A) and D)
G) A) and E)

Question 2

What are the required coefficients to properly balance the following chemical reaction? H2(g) + Cl2(g) → HCl(g)

Accepted Answer

A)  1,1,2
B)  2,2,  12\frac{1}{2}21​ 
C)  1,1,1
D)  2,1,2
E)  1,2,1 F) B) and E)
G) All of the above

Question 3

If the percent yield for the following reaction is 75.0%,and 45.0 g of NO2 are consumed in the reaction,how many grams of nitric acid,HNO3(aq) ,are produced? 
3NO2(g) + H2O(l) → 2HNO3(aq) + NO(g)

Accepted Answer

A)  30.8 g
B)  41.1 g
C)  54.8 g
D)  69.3 gE) C) and D)
F) A) and D)

Question 4

According to the following balanced reaction,how many moles of HNO3 are formed from 8.44 moles of NO2 if there is plenty of water present? 
3NO2(g) + H2O(l) → 2HNO3(aq) + NO(g)

Accepted Answer

A)  2.81 moles HNO3
B)  25.3 moles HNO3
C)  8.44 moles HNO3
D)  5.63 moles HNO3
E)  1.83 moles HNO3F) All of the above
G) D) and E)

Question 5

Determine the oxidizing agent in the following reaction. 
Ni(s) + 2AgClO4(aq) → Ni(ClO4) 2(aq) + 2Ag(s)

Accepted Answer

A)  Ag+
B)  Ni
C)  Cl
D)  O
E)  This is not an oxidation-reduction reaction.F) A) and C)
G) B) and C)

Question 6

What are the required coefficients to properly balance the following chemical reaction? NO(g) + H2O(g) ? NH3(g) + O2(g)

Accepted Answer

A)  4,6,4,  52\frac { 5 } { 2 }25​ 
B)  4,6,4,5
C)  2,3,2,2
D)  2,3,2,3
E)  4,4,6,6 F) None of the above
G) A) and E)

Question 7

Which one of the following compounds is insoluble in water?

Accepted Answer

A)  Na2SO4
B)  KNO3
C)  BaSO4
D)  Li2CO3E) A) and B)
F) B) and C)

Question 8

Consider the following balanced reaction.What mass (in g) of CO2 can be formed from 288 mg of O2? Assume that there is excess C3H7SH present. C3H7SH(l) + 6O2(g) → 3CO2(g) + SO2(g) + 4H2O(g)

Accepted Answer

A)  0.396 g CO2
B)  0.209 g CO2
C)  0.792 g CO2
D)  0.126 g CO2
E)  0.198 g CO2F) All of the above
G) A) and D)

Question 9

What is the concentration of NO3- ions in a solution prepared by dissolving 25.0 g of Ca(NO3) 2 in enough water to produce 300.mL of solution?

Accepted Answer

A)  0.254 mol L-1
B)  0.508 mol L-1
C)  0.672 mol L-1
D)  1.02 mol L-1E) A) and B)
F) None of the above

Question 10

What is the reduction half-reaction for the following overall galvanic cell reaction? 
Co2+(aq) + 2Ag(s) → Co(s) + 2 Ag+(aq)

Accepted Answer

A)  Ag(s) + e- → Ag+(aq) 
B)  Ag+(aq) + e- → Ag(s) 
C)  Co2+(aq) + 2 e- → Co(s) 
D)  Co2+(aq) + e- → Co(s) E) A) and B)
F) B) and C)

Question 11

Lead ions can be precipitated from aqueous solutions by the addition of aqueous iodide: 
 Pb2+\mathrm { Pb } ^ { 2 + }Pb2+  (aq) +  2I−2 \mathrm { I } ^ { - }2I−  (aq) ?  PbI2\mathrm { PbI } _ { 2 }PbI2​  (s)  Lead iodide is virtually insoluble in water so that the reaction appears to go to completion.How many millilitres of 3.550 mol L-1 HI(aq) must be added to a solution containing 0.700 mol of  Pb(NO3) 2(aq) \mathrm { Pb } \left( \mathrm { NO } _ { 3 } \right)  _ { 2 } ^ { ( a q )  }Pb(NO3​) 2(aq) ​  to completely precipitate the lead?

Accepted Answer

A)  197 mL
B)  0.197 mL
C)  394 mL
D)  0.394 mL
E)  2.54 × 10-3 mL F) B) and D)
G) A) and E)

Question 12

Identify oxidation and reduction half cell reactions:
(a)Zn(s)→ Zn2+(aq)+ 2e⁻
(b)Cu2+(aq)+ 2e⁻ → Cu(s)
Write the name of reaction.

Accepted Answer

Question 13

Which of the following compounds is an Arrhenius base?

Accepted Answer

A)  CH3CO2H
B)  C6H5NH2
C)  HNO2
D)  H2SO4E) A) and B)
F) A) and D)

Question 14

Which of the following pairs of aqueous solutions will form a precipitate when mixed?

Accepted Answer

A)  HCl + LiOH
B)  Li2S + HCl
C)  K2CO3 + HNO3
D)  MgCl2 + KOH
E)  All of these solution pairs will produce a precipitate.F) B) and C)
G) A) and B)

Question 15

What reagent could be used to separate Br- from CH3CO2- when added to an aqueous solution containing both?

Accepted Answer

A)  AgNO3(aq) 
B)  Ba(OH) 2(aq) 
C)  CuSO4(aq) 
D)  NaI(aq) E) C) and D)
F) A) and C)

Question 16

Balance the following redox reaction if it occurs in basic solution.What are the coefficients in front of Cr(OH) 4- and ClO- in the balanced reaction? 
Cr(OH) 4- (aq) + ClO- (aq) → CrO42- (aq) + Cl- (aq)

Accepted Answer

A)  Cr(OH) 4- = 2,ClO- = 3
B)  Cr(OH) 4- = 1,ClO- = 1
C)  Cr(OH) 4- = 1,ClO- = 2
D)  Cr(OH) 4- = 2,ClO- = 6
E)  Cr(OH) 4- = 6,ClO- = 5F) C) and D)
G) A) and E)

Question 17

List the spectator ions in the following reaction:
Ba+2(aq)+ 2OH-(aq)+ 2 Na+(aq)+ CO3-2(aq)→ 2 Na+(aq)+ 2OH-(aq)+ BaCO3(s)

Accepted Answer

Question 18

What element is being oxidized in the following (unbalanced) redox reaction? Zn2+(aq) + NH4+(aq) → Zn(s) + NO3- (aq)

Accepted Answer

A)  Zn
B)  N
C)  H
D)  OE) B) and C)
F) A) and D)

Question 19

Give the theoretical yield,in moles,of CO2 from the reaction of 4.00 moles of C8H18 with 4.00 moles of O2. 
2C8H18 + 25O2 → 16CO2 + 18H2O

Accepted Answer

A)  0.640 moles
B)  64.0 moles
C)  2.56 moles
D)  16.0 molesE) None of the above
F) A) and B)

Question 20

What is the molarity of a potassium triiodide solution,KI3(aq) ,if 30.00 mL of the solution is required to completely react with 25.00 mL of a 0.200 mol L-1 thiosulfate solution,K2S2O3(aq) ? The chemical equation for the reaction is 2S2O32-(aq) + I3-(aq) → S4O62-(aq) + 3I-(aq)

Accepted Answer

A)  0.0833 mol L-1
B)  0.120 mol L-1
C)  0.167 mol L-1
D)  0.333 mol L-1E) A) and B)
F) All of the above

Exam 4: Chemical Reactions and Stoichiometry

Which of the following pairs of aqueous solutions will form a precipitate when mixed?

Correct Answer
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Balance the following redox reaction if it occurs in basic solution.What are the coefficients in front of Cr(OH) ₄^-and ClO^- in the balanced reaction? Cr(OH) ₄^- (aq) + ClO^- (aq) → CrO₄²^- (aq) + Cl^- (aq)

Correct Answer
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What are the required coefficients to properly balance the following chemical reaction? NO(g) + H₂O(g) ? NH₃(g) + O₂(g)

Correct Answer
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Consider the following balanced reaction.What mass (in g) of CO₂ can be formed from 288 mg of O₂? Assume that there is excess C₃H₇SH present. C₃H₇SH(l) + 6O₂(g) → 3CO₂(g) + SO₂(g) + 4H₂O(g)

Correct Answer
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Which one of the following compounds is insoluble in water?

Correct Answer
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Which of the following compounds is an Arrhenius base?

Correct Answer
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Determine the oxidizing agent in the following reaction. Ni(s) + 2AgClO₄(aq) → Ni(ClO₄) ₂(aq) + 2Ag(s)

Correct Answer
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What is the concentration of NO₃^- ions in a solution prepared by dissolving 25.0 g of Ca(NO₃) ₂ in enough water to produce 300.mL of solution?

Correct Answer
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According to the following balanced reaction,how many moles of HNO₃ are formed from 8.44 moles of NO₂if there is plenty of water present? 3NO₂(g) + H₂O(l) → 2HNO₃(aq) + NO(g)

Correct Answer
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What is the reduction half-reaction for the following overall galvanic cell reaction? Co²⁺(aq) + 2Ag(s) → Co(s) + 2 Ag⁺(aq)

Correct Answer
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List the spectator ions in the following reaction: Ba⁺²(aq)+ 2OH^-(aq)+ 2 Na⁺(aq)+ CO₃^-2(aq)→ 2 Na⁺(aq)+ 2OH^-(aq)+ BaCO₃(s)

Correct Answer
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Correct Answer
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What are the required coefficients to properly balance the following chemical reaction? H₂(g) + Cl₂(g) → HCl(g)

Correct Answer
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What element is being oxidized in the following (unbalanced) redox reaction? Zn²⁺(aq) + NH₄⁺(aq) → Zn(s) + NO₃^- (aq)

Correct Answer
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Identify oxidation and reduction half cell reactions: (a)Zn(s)→ Zn²⁺(aq)+ 2e⁻ (b)Cu²⁺(aq)+ 2e⁻ → Cu(s) Write the name of reaction.

Correct Answer
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Give the theoretical yield,in moles,of CO₂from the reaction of 4.00 moles of C₈H₁₈ with 4.00 moles of O₂. 2C₈H₁₈ + 25O₂ → 16CO₂ + 18H₂O

Correct Answer
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What reagent could be used to separate Br^- from CH₃CO₂^-when added to an aqueous solution containing both?

Correct Answer
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Balance the following redox reaction if it occurs in basic solution.What are the coefficients in front of ClO₂and H₂O in the balanced reaction? H₂O₂(l) + ClO₂(aq) → ClO₂⁻(aq) + O₂(g)

Correct Answer
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Correct Answer
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If the percent yield for the following reaction is 75.0%,and 45.0 g of NO₂ are consumed in the reaction,how many grams of nitric acid,HNO₃(aq) ,are produced? 3NO₂(g) + H₂O(l) → 2HNO₃(aq) + NO(g)

Correct Answer
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Exam 4: Chemical Reactions and Stoichiometry

Which of the following pairs of aqueous solutions will form a precipitate when mixed?

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Balance the following redox reaction if it occurs in basic solution.What are the coefficients in front of Cr(OH) 4- and ClO- in the balanced reaction? Cr(OH) 4- (aq) + ClO- (aq) → CrO42- (aq) + Cl- (aq)

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What are the required coefficients to properly balance the following chemical reaction? NO(g) + H2O(g) ? NH3(g) + O2(g)

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Consider the following balanced reaction.What mass (in g) of CO2 can be formed from 288 mg of O2? Assume that there is excess C3H7SH present. C3H7SH(l) + 6O2(g) → 3CO2(g) + SO2(g) + 4H2O(g)

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Which one of the following compounds is insoluble in water?

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Which of the following compounds is an Arrhenius base?

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Determine the oxidizing agent in the following reaction. Ni(s) + 2AgClO4(aq) → Ni(ClO4) 2(aq) + 2Ag(s)

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What is the concentration of NO3- ions in a solution prepared by dissolving 25.0 g of Ca(NO3) 2 in enough water to produce 300.mL of solution?

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According to the following balanced reaction,how many moles of HNO3 are formed from 8.44 moles of NO2 if there is plenty of water present? 3NO2(g) + H2O(l) → 2HNO3(aq) + NO(g)

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What is the reduction half-reaction for the following overall galvanic cell reaction? Co2+(aq) + 2Ag(s) → Co(s) + 2 Ag+(aq)

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List the spectator ions in the following reaction: Ba+2(aq)+ 2OH-(aq)+ 2 Na+(aq)+ CO3-2(aq)→ 2 Na+(aq)+ 2OH-(aq)+ BaCO3(s)

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What are the required coefficients to properly balance the following chemical reaction? H2(g) + Cl2(g) → HCl(g)

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What element is being oxidized in the following (unbalanced) redox reaction? Zn2+(aq) + NH4+(aq) → Zn(s) + NO3- (aq)

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Identify oxidation and reduction half cell reactions: (a)Zn(s)→ Zn2+(aq)+ 2e⁻ (b)Cu2+(aq)+ 2e⁻ → Cu(s) Write the name of reaction.

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Give the theoretical yield,in moles,of CO2 from the reaction of 4.00 moles of C8H18 with 4.00 moles of O2. 2C8H18 + 25O2 → 16CO2 + 18H2O

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What reagent could be used to separate Br- from CH3CO2- when added to an aqueous solution containing both?

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Balance the following redox reaction if it occurs in basic solution.What are the coefficients in front of ClO2 and H2O in the balanced reaction? H2O2(l) + ClO2(aq) → ClO2⁻(aq) + O2(g)

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What is the molarity of a potassium triiodide solution,KI3(aq) ,if 30.00 mL of the solution is required to completely react with 25.00 mL of a 0.200 mol L-1 thiosulfate solution,K2S2O3(aq) ? The chemical equation for the reaction is 2S2O32-(aq) + I3-(aq) → S4O62-(aq) + 3I-(aq)

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If the percent yield for the following reaction is 75.0%,and 45.0 g of NO2 are consumed in the reaction,how many grams of nitric acid,HNO3(aq) ,are produced? 3NO2(g) + H2O(l) → 2HNO3(aq) + NO(g)

Correct AnswerverifiedShow Answer

Correct Answer
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Balance the following redox reaction if it occurs in basic solution.What are the coefficients in front of Cr(OH) ₄^-and ClO^- in the balanced reaction? Cr(OH) ₄^- (aq) + ClO^- (aq) → CrO₄²^- (aq) + Cl^- (aq)

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What are the required coefficients to properly balance the following chemical reaction? NO(g) + H₂O(g) ? NH₃(g) + O₂(g)

Correct Answer
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Consider the following balanced reaction.What mass (in g) of CO₂ can be formed from 288 mg of O₂? Assume that there is excess C₃H₇SH present. C₃H₇SH(l) + 6O₂(g) → 3CO₂(g) + SO₂(g) + 4H₂O(g)

Correct Answer
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Correct Answer
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Correct Answer
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Determine the oxidizing agent in the following reaction. Ni(s) + 2AgClO₄(aq) → Ni(ClO₄) ₂(aq) + 2Ag(s)

Correct Answer
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What is the concentration of NO₃^- ions in a solution prepared by dissolving 25.0 g of Ca(NO₃) ₂ in enough water to produce 300.mL of solution?

Correct Answer
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According to the following balanced reaction,how many moles of HNO₃ are formed from 8.44 moles of NO₂if there is plenty of water present? 3NO₂(g) + H₂O(l) → 2HNO₃(aq) + NO(g)

Correct Answer
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What is the reduction half-reaction for the following overall galvanic cell reaction? Co²⁺(aq) + 2Ag(s) → Co(s) + 2 Ag⁺(aq)

Correct Answer
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List the spectator ions in the following reaction: Ba⁺²(aq)+ 2OH^-(aq)+ 2 Na⁺(aq)+ CO₃^-2(aq)→ 2 Na⁺(aq)+ 2OH^-(aq)+ BaCO₃(s)

Correct Answer
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Correct Answer
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What are the required coefficients to properly balance the following chemical reaction? H₂(g) + Cl₂(g) → HCl(g)

Correct Answer
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What element is being oxidized in the following (unbalanced) redox reaction? Zn²⁺(aq) + NH₄⁺(aq) → Zn(s) + NO₃^- (aq)

Correct Answer
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Identify oxidation and reduction half cell reactions: (a)Zn(s)→ Zn²⁺(aq)+ 2e⁻ (b)Cu²⁺(aq)+ 2e⁻ → Cu(s) Write the name of reaction.

Correct Answer
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Give the theoretical yield,in moles,of CO₂from the reaction of 4.00 moles of C₈H₁₈ with 4.00 moles of O₂. 2C₈H₁₈ + 25O₂ → 16CO₂ + 18H₂O

Correct Answer
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What reagent could be used to separate Br^- from CH₃CO₂^-when added to an aqueous solution containing both?

Correct Answer
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Balance the following redox reaction if it occurs in basic solution.What are the coefficients in front of ClO₂and H₂O in the balanced reaction? H₂O₂(l) + ClO₂(aq) → ClO₂⁻(aq) + O₂(g)

Correct Answer
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Correct Answer
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If the percent yield for the following reaction is 75.0%,and 45.0 g of NO₂ are consumed in the reaction,how many grams of nitric acid,HNO₃(aq) ,are produced? 3NO₂(g) + H₂O(l) → 2HNO₃(aq) + NO(g)

Correct Answer
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