Question 1

Determine the cell diagram for the reaction below.Assume a platinum electrode is used when no other solid is present. 2Fe2+(aq)+ Pb2+(aq)$\rarr$2Fe3+(aq)+ Pb(s)

Accepted Answer

A) Pt(s)| Fe2+(aq), Fe3+(aq)|| Pb2+(aq)| Pb(s) 
B) Pb(s)| Pb2+(aq)|| Fe2+(aq), Fe3+(aq)| Pt(s) 
C) Pt(s)| Fe3+(aq), Fe2+(aq)|| Pb(s)| Pb2+(aq)| Pt(s) 
D) Pt(s)| Pb2+(aq)| Pb(s)|| Fe2+(aq), Fe3+(aq)| Pt(s) 
E) Pt(s)| Fe2+(aq), Pb2+(aq)|| Fe3+(aq)| Pb(s) 
A) Pt(s)| Fe2+(aq), Fe3+(aq)|| Pb2+(aq)| Pb(s) 
B) Pb(s)| Pb2+(aq)|| Fe2+(aq), Fe3+(aq)| Pt(s) 
C) Pt(s)| Fe3+(aq), Fe2+(aq)|| Pb(s)| Pb2+(aq)| Pt(s) 
D) Pt(s)| Pb2+(aq)| Pb(s)|| Fe2+(aq), Fe3+(aq)| Pt(s) 
E) Pt(s)| Fe2+(aq), Pb2+(aq)|| Fe3+(aq)| Pb(s)

Question 2

A metal object is to be gold-plated by an electrolytic procedure using aqueous AuCl3 electrolyte.Calculate the number of moles of gold deposited in 3.0 min by a constant current of 10.A.

Accepted Answer

A) 6.2 × 10-3 mol 
B) 9.3 × 10-3 mol 
C) 1.8 × 10-2 mol 
D) 3.5 × 10-5 mol 
E) 160 mol 
A) 6.2 × 10-3 mol 
B) 9.3 × 10-3 mol 
C) 1.8 × 10-2 mol 
D) 3.5 × 10-5 mol 
E) 160 mol

Question 3

Complete and balance the following redox equation.When properly balanced using the smallest whole-number coefficients, the coefficient of S is 
H2S + HNO3 $\rarr$ S + NO (acidic solution)

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 5 
E) 6 
A) 1 
B) 2 
C) 3 
D) 5 
E) 6

Question 4

Given the following standard reduction potentials,   calculate the solubility product of AgCN at 25°C.

Accepted Answer

A) 4.3 × 10-14 
B) 2.3 × 1013 
C) 2.1 × 10-14 
D) 5.1 × 1013 
E) None of these 
A) 4.3 × 10-14 
B) 2.3 × 1013 
C) 2.1 × 10-14 
D) 5.1 × 1013 
E) None of these

Question 5

How many coulombs (C)of electrical charge must pass through an electrolytic cell to reduce 0.44 mol Ca2+ ion to calcium metal?

Accepted Answer

A) 190,000 C 
B) 85,000 C 
C) 21,000 C 
D) 42,500 C 
E) 0.88 C 
A) 190,000 C 
B) 85,000 C 
C) 21,000 C 
D) 42,500 C 
E) 0.88 C

Question 6

Consider the following electrochemical cell: U | U3+(aq)|| Cl-(aq),Cl2(g)| Pt
If the standard cell emf is 3.16 V, what is the standard reduction potential for uranium?

Accepted Answer

A) -3.16 V 
B) +3.16 V 
C) -1.80 V 
D) +1.80 V 
E) +1.36 V 
A) -3.16 V 
B) +3.16 V 
C) -1.80 V 
D) +1.80 V 
E) +1.36 V

Question 7

How many moles of silver metal are produced in 1.2 hours by the electrolysis of AgNO3(aq)using a current of 6.0 A?

Accepted Answer

Question 8

Calculate E°cell for the following reaction: 2Fe2+(aq)+ Cd2+(aq)$\rarr$2Fe3+(aq)+ Cd(s)

Accepted Answer

A) -0.37 V 
B) 0.37 V 
C) -1.17 V 
D) 1.17 V 
E) None of these. 
A) -0.37 V 
B) 0.37 V 
C) -1.17 V 
D) 1.17 V 
E) None of these.

Question 9

How many moles of H2 are produced by 5.00 A of current passing through a cell containing aqueous NaCl for 4.00 × 102 s?

Accepted Answer

Question 10

When an aqueous solution of NaCl is electrolyzed, Na(l)is produced at the cathode, and Cl2(g)is evolved at the anode.

Accepted Answer

A) True 
 B)False

Question 11

How many coulombs of charge are required to cause reduction of 0.20 mole of Cr3+ to Cr?

Accepted Answer

A) 0.60 C 
B) 3.0 C 
C) 2.9 × 104 C 
D) 5.8 × 104 C 
E) 9.65 × 104 C 
A) 0.60 C 
B) 3.0 C 
C) 2.9 × 104 C 
D) 5.8 × 104 C 
E) 9.65 × 104 C

Question 12

How many grams of nickel would be electroplated by passing a constant current of 7.2 A through a solution of NiSO4 for 90.0 min?

Accepted Answer

A) 0.20 g 
B) 0.40 g 
C) 12 g 
D) 24 g 
E) 47 g 
A) 0.20 g 
B) 0.40 g 
C) 12 g 
D) 24 g 
E) 47 g

Question 13

How many coulombs of charge are required to cause reduction of 0.25 mole of Cu2+ to Cu?

Accepted Answer

A) 0.25 C 
B) 0.50 C 
C) 1.2 × 104 C 
D) 2.4 × 104 C 
E) 4.8 × 104 C 
A) 0.25 C 
B) 0.50 C 
C) 1.2 × 104 C 
D) 2.4 × 104 C 
E) 4.8 × 104 C

Question 14

Will H2(g)form when Ag is placed in 1.0 M HCl?

Accepted Answer

Question 15

An electroplating solution is made up of nickel(II)sulfate.How much time would it take to deposit 0.500 g of metallic nickel on a custom car part using a current of 3.00 A?

Accepted Answer

The answer of An electroplating solution is made up of...

Question 16

Calculate the cell emf for the following reaction: Cu2+(0.10 M)+ H2(1 atm)$\rarr$Cu(s)+ 2H+(pH = 3.00)

Accepted Answer

A) 0.49 V 
B) 0.19 V 
C) 0.15 V 
D) 0.40 V 
E) -0.34 V 
A) 0.49 V 
B) 0.19 V 
C) 0.15 V 
D) 0.40 V 
E) -0.34 V

Question 17

Calculate $\Delta$G° (kJ/mol)for the following electrochemical cell:
Be(s)| Be2+(aq)|| Mn2+(aq)| Mn(s)

Accepted Answer

Question 18

Calculate E°cell for a silver-aluminum cell in which the cell reaction is Al(s)+ 3Ag+(aq)$\rarr$ Al3+(aq)+ 3Ag(s)

Accepted Answer

A) -2.46 V 
B) 0.86 V 
C) -0.86 V 
D) 2.46 V 
E) none of these 
A) -2.46 V 
B) 0.86 V 
C) -0.86 V 
D) 2.46 V 
E) none of these

Question 19

Calculate the cell emf for the following reaction at 25°C: Ni(s)+ 2Cu2+(0.010 M)$\rarr$ Ni2+(0.0010 M)+ 2Cu+(1.0 M)

Accepted Answer

A) 0.40 V 
B) -0.43 V 
C) 0.43 V 
D) 0.34 V 
E) 0.37 V 
A) 0.40 V 
B) -0.43 V 
C) 0.43 V 
D) 0.34 V 
E) 0.37 V

Question 20

Which of the following would be considered a Lead Storage Battery?

Accepted Answer

A) C3H8(g)+ 5O2(g)$\rarr$ 3CO2(g)+ 4H2O(l) 
B) Pb(s)+ PbO2(s)+ 4H+(aq)+ 2SO42-(aq)$\rarr$ 2PbSO4(s)+ 2H2O(l) 
C) Zn(s)+ 2NH4+(aq)+ 2MnO2(s)$\rarr$Zn2+(aq)+ 2NH3(aq)+ H2O(l)+ Mn2O3(s) 
D) Zn(Hg)+ HgO(s)$\rarr$ ZnO(s)+ Hg(l) 
E) 2Fe(s)+ O2(g)+ 4H+(aq)$\rarr$2Fe2+(aq)+ 2H2O(l) 
A) C3H8(g)+ 5O2(g)$\rarr$ 3CO2(g)+ 4H2O(l) 
B) Pb(s)+ PbO2(s)+ 4H+(aq)+ 2SO42-(aq)$\rarr$ 2PbSO4(s)+ 2H2O(l) 
C) Zn(s)+ 2NH4+(aq)+ 2MnO2(s)$\rarr$Zn2+(aq)+ 2NH3(aq)+ H2O(l)+ Mn2O3(s) 
D) Zn(Hg)+ HgO(s)$\rarr$ ZnO(s)+ Hg(l) 
E) 2Fe(s)+ O2(g)+ 4H+(aq)$\rarr$2Fe2+(aq)+ 2H2O(l)

Exam 18: Electrochemistry

Determine the cell diagram for the reaction below.Assume a platinum electrode is used when no other solid is present. 2Fe2+(aq)+ Pb2+(aq) →\rarr→ 2Fe3+(aq)+ Pb(s)

A metal object is to be gold-plated by an electrolytic procedure using aqueous AuCl3 electrolyte.Calculate the number of moles of gold deposited in 3.0 min by a constant current of 10.A.

Complete and balance the following redox equation.When properly balanced using the smallest whole-number coefficients, the coefficient of S is H2S + HNO3 →\rarr→ S + NO (acidic solution)

Given the following standard reduction potentials, calculate the solubility product of AgCN at 25°C.

How many coulombs (C)of electrical charge must pass through an electrolytic cell to reduce 0.44 mol Ca2+ ion to calcium metal?

Consider the following electrochemical cell: U | U3+(aq)|| Cl-(aq),Cl2(g)| Pt If the standard cell emf is 3.16 V, what is the standard reduction potential for uranium?

How many moles of silver metal are produced in 1.2 hours by the electrolysis of AgNO3(aq)using a current of 6.0 A?

Calculate E°cell for the following reaction: 2Fe2+(aq)+ Cd2+(aq) →\rarr→ 2Fe3+(aq)+ Cd(s)

How many moles of H2 are produced by 5.00 A of current passing through a cell containing aqueous NaCl for 4.00 × 102 s?

When an aqueous solution of NaCl is electrolyzed, Na(l)is produced at the cathode, and Cl2(g)is evolved at the anode.

How many coulombs of charge are required to cause reduction of 0.20 mole of Cr3+ to Cr?

How many grams of nickel would be electroplated by passing a constant current of 7.2 A through a solution of NiSO4 for 90.0 min?

How many coulombs of charge are required to cause reduction of 0.25 mole of Cu2+ to Cu?

Will H2(g)form when Ag is placed in 1.0 M HCl?

An electroplating solution is made up of nickel(II)sulfate.How much time would it take to deposit 0.500 g of metallic nickel on a custom car part using a current of 3.00 A?

Calculate the cell emf for the following reaction: Cu2+(0.10 M)+ H2(1 atm) →\rarr→ Cu(s)+ 2H+(pH = 3.00)

Calculate Δ\DeltaΔ G° (kJ/mol)for the following electrochemical cell: Be(s)| Be2+(aq)|| Mn2+(aq)| Mn(s)

Calculate E°cell for a silver-aluminum cell in which the cell reaction is Al(s)+ 3Ag+(aq) →\rarr→ Al3+(aq)+ 3Ag(s)

Calculate the cell emf for the following reaction at 25°C: Ni(s)+ 2Cu2+(0.010 M) →\rarr→ Ni2+(0.0010 M)+ 2Cu+(1.0 M)

Which of the following would be considered a Lead Storage Battery?

Chemistry: the Study of Change

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Mass Relationships in Chemical Reactions

Reactions in Aqueous Solutions

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Quantum Theory and the Electronic Structure of Atoms

Periodic Relationships Among the Elements

Chemical Bonding I: Basic Concepts

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Filters

Determine the cell diagram for the reaction below.Assume a platinum electrode is used when no other solid is present. 2Fe²⁺(aq)+ Pb²⁺(aq) $\rarr$ 2Fe³⁺(aq)+ Pb(s)

A metal object is to be gold-plated by an electrolytic procedure using aqueous AuCl₃ electrolyte.Calculate the number of moles of gold deposited in 3.0 min by a constant current of 10.A.

Complete and balance the following redox equation.When properly balanced using the smallest whole-number coefficients, the coefficient of S is H₂S + HNO₃ $\rarr$ S + NO (acidic solution)

How many coulombs (C)of electrical charge must pass through an electrolytic cell to reduce 0.44 mol Ca²⁺ ion to calcium metal?

Consider the following electrochemical cell: U | U³⁺(aq)|| Cl^-(aq),Cl₂(g)| Pt If the standard cell emf is 3.16 V, what is the standard reduction potential for uranium?

How many moles of silver metal are produced in 1.2 hours by the electrolysis of AgNO₃(aq)using a current of 6.0 A?

Calculate E°_cell for the following reaction: 2Fe²⁺(aq)+ Cd²⁺(aq) $\rarr$ 2Fe³⁺(aq)+ Cd(s)

How many moles of H₂ are producedby 5.00 A of current passing through a cell containing aqueous NaCl for 4.00 × 10² s?

When an aqueous solution of NaCl is electrolyzed, Na(l)is produced at the cathode, and Cl₂(g)is evolved at the anode.

How many coulombs of charge are required to cause reduction of 0.20 mole of Cr³⁺ to Cr?

How many grams of nickel would be electroplated by passing a constant current of 7.2 A through a solution of NiSO₄ for 90.0 min?

How many coulombs of charge are required to cause reduction of 0.25 mole of Cu²⁺ to Cu?

Will H₂(g)form when Ag is placed in 1.0 M HCl?

Calculate the cell emf for the following reaction: Cu²⁺(0.10 M)+ H₂(1 atm) $\rarr$ Cu(s)+ 2H⁺(pH = 3.00)

Calculate $\Delta$ G° (kJ/mol)for the following electrochemical cell: Be(s)| Be²⁺(aq)|| Mn²⁺(aq)| Mn(s)

Calculate E°_cell for a silver-aluminum cell in which the cell reaction is Al(s)+ 3Ag⁺(aq) $\rarr$ Al³⁺(aq)+ 3Ag(s)

Calculate the cell emf for the following reaction at 25°C: Ni(s)+ 2Cu²⁺(0.010 M) $\rarr$ Ni²⁺(0.0010 M)+ 2Cu⁺(1.0 M)