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Review of Electrochemistry

Review Test

Table of Contents

Further Reading

What is the oxidation state of H2?

What is the oxidation state of gold in Au(CN)4 -?

What is the change in oxidation state for carbon in the following reaction?

What is the oxidation state of Xe in XeOF4?

In which of the following compounds does O have an oxidation state not equal to -2?

Which of the following reactions is NOT a redox reaction?

Which of the following terms best describes CH4 in the following reaction?

Which of the following are reduced in the following redox reaction?

What are the values of A-F that balance the following equation?

What are the values of A-G that balance the following equation?

What are the values of A-E that balance the following equation?

What are the values of A-E that balance the following equation?

What are the values of A-D that balance the following equation?

Give the line notation for a cell that reduces CuSO4 to Cu and oxidizes Zn to Zn2+.

Give the line notation for the following redox reaction:

In the following galvanic cell, identify the direction of electron flow: Pt (s) | MnO4 - (aq), Mn2+ (aq), H+ (aq) || Fe2+ (aq), Fe3+ (aq) | Pt (s)

What is the direction of ion flow through a porous disk in a galvanic cell?

What is the sign of ΔG for a galvanic cell?

What is the sign of E for a galvanic cell?

Which half-reaction takes place at the anode?

Which of the following is an equation for ΔG?

What is the free energy of formation for water, given its Eo for decomposition into hydrogen and oxygen is -1.23 V?

Using your chemical intuition, which of the following species is the strongest oxidizing agent?

What species must copper be oxidized to if the cell potential for one of its redox reactions is 1.0 V and the free energy of the reaction is -289.5 kJ / mol?

What is a faraday?

What happens to the cell potential of a non-standard state reaction when the temperature increases?

What happens to the potential of the following reaction when the concentration of Fe2+ is halved and the concentration of Mn2+ is doubled?

Which of the following statements about concentration cells are true?

What is the potential of the following cell at 45oC? Ag (s) | Ag+ (aq) || Ag+ (aq) [0.1 M] | Ag (s)

What is the direction of ion flow through the porous disk in a concentration cell?

Why do most ships with iron hulls hang from those hulls a piece of magnesium?

Even though redox reactions are reversible by applying an outside source emf, why aren't all batteries rechargeable?

Which of the following redox reactions is primarily responsible for producing most of what you eat?

What is the potential of the following reaction that has a ΔG of -264 kJ / mol? Na+ + Cl- ---> NaCl

Aluminum, in the 18th century, was more valuable than gold. Explain why that was so, and why now the opposite is true.

At which electrode is H2 in the electrolysis of water?

Why is it necessary to add some salts to water for the electrolysis of water to proceed?

Which of the following is NOT produced during the electrolysis of water?

Relative to the amount of oxygen produced, how much hydrogen gas is evolved during the electrolysis of water?

If you added a drop of phenolphthalein during the electrolysis of water, at which electrode would you see the color change and why?

How long will it take 1.0 kg of Au to late from a solution of Au3+ with a current of 150 A?

How many grams of Pu (from Pu2+) will be plated onto a cathode in ten minutes with a current of 10 A?

A metal plates 1.41 g onto a cathode from a species in solution in 70 minutes with a current of 2.5 A. Identify the species.

How long will it take to completely dissolve a silver anode whose mass is 3 g if a 2.0 A current is passed through it.

At STP, what volume of hydrogen gas is produced in the electrolysis of water is a current of 50 A is passes through a solution of pure water for 10 minutes?

At STP, what volume of hydrogen gas is produced in the electrolysis of water is a current of 50 A is passes through a solution of salt water for 10 minutes?

What is the molar mass of a substance that plates 5 g of itself in 10 minutes with a current of 10 A and requires 2 electrons per mole of that substance?

Given a solution with equal concentrations of the following species, using your chemical intuition, which one should plate first if the external potential is slowly increased from zero to larger values?

Using your chemical intuition, what combination of elements would make a very powerful battery?

Would a table of standard oxidation tables be just as valid as a table of standard reduction potentials and why?

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