Question 1

What mass of aluminum can be plated onto an object in 755 minutes at 5.80 A of current?

Accepted Answer

A)  73.5 g 
B)  24.5 g 
C)  220. g 
D)  147 g 
E)  8.17 g 
A)  73.5 g 
B)  24.5 g 
C)  220. g 
D)  147 g 
E)  8.17 g

Question 2

What element is being reduced in the following redox reaction?
Cr(OH)4⁻(aq)+ ClO⁻(aq)→ CrO42-(aq)+ Cl⁻(aq)

Accepted Answer

A)  Cr 
B)  O 
C)  H 
D)  Cl 
A)  Cr 
B)  O 
C)  H 
D)  Cl

Question 3

Which battery uses the metal with the least dense metal?

Accepted Answer

A)  nickel-metal hydride 
B)  lithium-ion 
C)  nickel-cadmium 
D)  lead acid 
E)  dry cell 
A)  nickel-metal hydride 
B)  lithium-ion 
C)  nickel-cadmium 
D)  lead acid 
E)  dry cell

Question 4

Describe the reactions during the electrolysis of water in an electrolytic cell.

Accepted Answer

A)  Oxygen is reduced and hydrogen is oxidized. 
B)  Oxygen and hydrogen are both oxidized. 
C)  Oxygen and hydrogen are both reduced. 
D)  Oxygen is oxidized and hydrogen is reduced. 
E)  Neither oxygen or hydrogen are oxidized or reduced. 
A)  Oxygen is reduced and hydrogen is oxidized. 
B)  Oxygen and hydrogen are both oxidized. 
C)  Oxygen and hydrogen are both reduced. 
D)  Oxygen is oxidized and hydrogen is reduced. 
E)  Neither oxygen or hydrogen are oxidized or reduced.

Question 5

What is the reducing agent in the redox reaction represented by the following cell notation?
Zn(s)∣ Zn2+(aq)   Ag+(aq)∣ Ag(s)

Accepted Answer

A)  Zn(s) 
B)  Zn2+(aq) 
C)  Ag+(aq) 
D)  Ag(s) 
E)  Pt 
A)  Zn(s) 
B)  Zn2+(aq) 
C)  Ag+(aq) 
D)  Ag(s) 
E)  Pt

Question 6

Identify oxidation.

Accepted Answer

A)  increase in oxidation number 
B)  loss of electrons 
C)  gain of electrons 
D)  loss of protons 
E)  both A and B 
A)  increase in oxidation number 
B)  loss of electrons 
C)  gain of electrons 
D)  loss of protons 
E)  both A and B

Question 7

What element is being oxidized in the following redox reaction?
MnO4⁻(aq)+ H2C2O4(aq)→ Mn2+(aq)+ CO2(g)

Accepted Answer

A)  C 
B)  O 
C)  Mn 
D)  H 
A)  C 
B)  O 
C)  Mn 
D)  H

Question 8

The most useful ore of aluminum is bauxite,in which Al is present as hydrated oxides,   The number of kilowatt-hours of electricity required to produce   of aluminum from electrolysis of compounds from bauxite is ________ when the applied emf is

Accepted Answer

A)  0.0213 
B)  0.0469 
C)  31.3 
D)  15.6 
E)  46.9 
A)  0.0213 
B)  0.0469 
C)  31.3 
D)  15.6 
E)  46.9

Question 9

Use the tabulated half-cell potentials to calculate ΔG° for the following balanced redox reaction. Pb2+(aq)+ Cu(s)→ Pb(s)+ Cu2+(aq)

Accepted Answer

A)  -41 kJ 
B)  -0.47 kJ 
C)  +46 kJ 
D)  +91 kJ 
E)  -21 kJ 
A)  -41 kJ 
B)  -0.47 kJ 
C)  +46 kJ 
D)  +91 kJ 
E)  -21 kJ

Question 10

Use the tabulated half-cell potentials to calculate the equilibrium constant (K)for the following balanced redox reaction at 25°C. Pb2+(aq)+ Cu(s)→ Pb(s)+ Cu2+(aq)

Accepted Answer

A)  7.9 × 10-8 
B)  8.9 × 107 
C)  7.9 × 1015 
D)  1.1 × 10-22 
E)  1.1 × 10-8 
A)  7.9 × 10-8 
B)  8.9 × 107 
C)  7.9 × 1015 
D)  1.1 × 10-22 
E)  1.1 × 10-8

Question 11

Determine which of the following pairs of reactants will result in a spontaneous reaction at 25°C.

Accepted Answer

A)  I-(aq) + Fe2+(aq) 
B)  Ca(s) + Mg2+(aq) 
C)  H2(g) + Ni2+(aq) 
D)  Ag(s) + Sn2+(aq) 
E)  All of the above pairs will react. 
A)  I-(aq) + Fe2+(aq) 
B)  Ca(s) + Mg2+(aq) 
C)  H2(g) + Ni2+(aq) 
D)  Ag(s) + Sn2+(aq) 
E)  All of the above pairs will react.

Question 12

What is electrolysis?

Accepted Answer

An electrical curren

Question 13

Which of the following is the strongest reducing agent?

Accepted Answer

A)  Al(s) 
B)  Mn(s) 
C)  Li(s) 
D)  Al3+(aq) 
E)  Mg2+(aq) 
A)  Al(s) 
B)  Mn(s) 
C)  Li(s) 
D)  Al3+(aq) 
E)  Mg2+(aq)

Question 14

Which of the following metals will dissolve in HCl?

Accepted Answer

A)  Ba 
B)  Na 
C)  Zn 
D)  Al 
E)  all of the above 
A)  Ba 
B)  Na 
C)  Zn 
D)  Al 
E)  all of the above

Question 15

Why is sugar water not a good conductor of current?

Accepted Answer

Sugar wate

Question 16

Define a salt bridge.

Accepted Answer

A)  A pathway, composed of salt water, that ions pass through. 
B)  A pathway in which no ions flow. 
C)  A pathway between the cathode and anode in which ions are reduced. 
D)  A pathway between the cathode and anode in which ions are oxidized. 
E)  A pathway by which counter ions can flow between the half-cells without the solutions in the half-cell totally mixing. 
A)  A pathway, composed of salt water, that ions pass through. 
B)  A pathway in which no ions flow. 
C)  A pathway between the cathode and anode in which ions are reduced. 
D)  A pathway between the cathode and anode in which ions are oxidized. 
E)  A pathway by which counter ions can flow between the half-cells without the solutions in the half-cell totally mixing.

Question 17

How many grams of chromium metal are plated out when a constant current of 8.00 A is passed through an aqueous solution containing Cr3+ ions for 320.minutes?

Accepted Answer

A)  27.6 g 
B)  49.2 g 
C)  82.4 g 
D)  248 g 
A)  27.6 g 
B)  49.2 g 
C)  82.4 g 
D)  248 g

Question 18

Which of the following is the strongest reducing agent?

Accepted Answer

A)  I2+(aq) 
B)  Cr3+(aq) 
C)  I-(aq) 
D)  Cr(s) 
E)  I(s) 
A)  I2+(aq) 
B)  Cr3+(aq) 
C)  I-(aq) 
D)  Cr(s) 
E)  I(s)

Question 19

How many electrons are transferred in the following reaction? (The reaction is unbalanced.)
Ba(s)+ Cr3+(aq)→ Cr(s)+ Ba2+(aq)

Accepted Answer

A)  6 
B)  2 
C)  3 
D)  1 
E)  4 
A)  6 
B)  2 
C)  3 
D)  1 
E)  4

Question 20

Consider the following standard reduction potentials, Al3+(aq)+ 3 e- → Al(s)E° = - 1.66 V
I2(s)+ 2 e- → 2 I-(aq)E° = +0.54 V
Under standard conditions,

Accepted Answer

A)  Al3+(aq) is a stronger oxidizing agent than I2(s) and I-(aq) is a stronger reducing agent than Al(s). 
B)  I2(s) is a stronger oxidizing agent than Al3+(aq) and Al(s) is a stronger reducing agent than I-(aq). 
C)  Al(s) is a stronger oxidizing agent than I-(aq) and Al3+(aq) is a stronger reducing agent than I2(s). 
D)  I-(aq) is a stronger oxidizing agent than Al(s) and I2(s) is a stronger reducing agent than Al3+(aq). 
A)  Al3+(aq) is a stronger oxidizing agent than I2(s) and I-(aq) is a stronger reducing agent than Al(s). 
B)  I2(s) is a stronger oxidizing agent than Al3+(aq) and Al(s) is a stronger reducing agent than I-(aq). 
C)  Al(s) is a stronger oxidizing agent than I-(aq) and Al3+(aq) is a stronger reducing agent than I2(s). 
D)  I-(aq) is a stronger oxidizing agent than Al(s) and I2(s) is a stronger reducing agent than Al3+(aq).

Exam 20: Electrochemistry

What mass of aluminum can be plated onto an object in 755 minutes at 5.80 A of current?

What element is being reduced in the following redox reaction? Cr(OH)4⁻(aq)+ ClO⁻(aq)→ CrO42-(aq)+ Cl⁻(aq)

Which battery uses the metal with the least dense metal?

Describe the reactions during the electrolysis of water in an electrolytic cell.

What is the reducing agent in the redox reaction represented by the following cell notation? Zn(s)∣ Zn2+(aq) Ag+(aq)∣ Ag(s)

Identify oxidation.

What element is being oxidized in the following redox reaction? MnO4⁻(aq)+ H2C2O4(aq)→ Mn2+(aq)+ CO2(g)

The most useful ore of aluminum is bauxite,in which Al is present as hydrated oxides, The number of kilowatt-hours of electricity required to produce of aluminum from electrolysis of compounds from bauxite is ________ when the applied emf is

Use the tabulated half-cell potentials to calculate ΔG° for the following balanced redox reaction. Pb2+(aq)+ Cu(s)→ Pb(s)+ Cu2+(aq)

Use the tabulated half-cell potentials to calculate the equilibrium constant (K)for the following balanced redox reaction at 25°C. Pb2+(aq)+ Cu(s)→ Pb(s)+ Cu2+(aq)

Determine which of the following pairs of reactants will result in a spontaneous reaction at 25°C.

What is electrolysis?

Which of the following is the strongest reducing agent?

Which of the following metals will dissolve in HCl?

Why is sugar water not a good conductor of current?

Define a salt bridge.

How many grams of chromium metal are plated out when a constant current of 8.00 A is passed through an aqueous solution containing Cr3+ ions for 320.minutes?

Which of the following is the strongest reducing agent?

How many electrons are transferred in the following reaction? (The reaction is unbalanced.) Ba(s)+ Cr3+(aq)→ Cr(s)+ Ba2+(aq)

Consider the following standard reduction potentials, Al3+(aq)+ 3 e- → Al(s)E° = - 1.66 V I2(s)+ 2 e- → 2 I-(aq)E° = +0.54 V Under standard conditions,

Essentials: Units, Measurements, and Problem Solving

Atoms

The Quantum Mechanical Model of the Atom

Periodic Properties of the Elements

Molecules and Compounds

Chemical Bonding I

Chemical Bonding Ii

Chemical Reactions and Chemical Quantities

Introduction to Solutions and Aqueous Reactions

Thermochemistry

Gases

Liquids, Solids, and Intermolecular Forces

Crystalline Solids and Modern Materials

Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Aqueous Ionic Equilibrium

Free Energy and Thermodynamics

Radioactivity and Nuclear Chemistry

Organic Chemistry

Transition Metals and Coordination Compounds

Filters

What element is being reduced in the following redox reaction? Cr(OH)₄⁻(aq)+ ClO⁻(aq)→ CrO₄^2-(aq)+ Cl⁻(aq)

What is the reducing agent in the redox reaction represented by the following cell notation? Zn(s)∣ Zn²⁺(aq) Ag⁺(aq)∣ Ag(s)

What element is being oxidized in the following redox reaction? MnO₄⁻(aq)+ H₂C₂O₄(aq)→ Mn²⁺(aq)+ CO₂(g)

Use the tabulated half-cell potentials to calculate ΔG° for the following balanced redox reaction. Pb²⁺(aq)+ Cu(s)→ Pb(s)+ Cu²⁺(aq)

Use the tabulated half-cell potentials to calculate the equilibrium constant (K)for the following balanced redox reaction at 25°C. Pb²⁺(aq)+ Cu(s)→ Pb(s)+ Cu²⁺(aq)

How many grams of chromium metal are plated out when a constant current of 8.00 A is passed through an aqueous solution containing Cr³⁺ ions for 320.minutes?

How many electrons are transferred in the following reaction? (The reaction is unbalanced.) Ba(s)+ Cr³⁺(aq)→ Cr(s)+ Ba²⁺(aq)

Consider the following standard reduction potentials, Al³⁺(aq)+ 3 e^- → Al(s)E° = - 1.66 V I₂(s)+ 2 e^- → 2 I^-(aq)E° = +0.54 V Under standard conditions,