Question 1

Choose the INCORRECT statement.

Accepted Answer

An electrochemical cell is not a half cell. A cell contains two half cells, each containing an electrode and a solution of its ions. The combination of two half cells produces an electrochemical cell.

Question 2

In a zinc-lead cell the reaction is: Pb²⁺(aq)+ Zn(s)→ Pb(s)+ Zn²⁺(aq)E° = 0.637 V Which of the following statements about this cell is FALSE?

Accepted Answer

A

Question 3

The active metal is called a sacrificial cathode.

Accepted Answer

The active metal is called a sacrificial anode, not cathode, because it corrodes or sacrifices itself to protect another metal from corrosion.

Question 4

Choose the INCORRECT statement.

Accepted Answer

SHE stands for Standard Hydrogen Electrode, not helium.

Question 5

Choose the correct statement based on the following oxidation potentials. Mg/Mg²⁺ +2.37 v Fe/Fe²⁺ +0.44 v Cu/Cu²⁺ -0.34 v Zn/Zn²⁺ +0.76 v Sn/Sn²⁺ +0.14 v Ag/Ag⁺ -0.80 v

Accepted Answer

Fe will displace H⁺ from solution because its oxidation potential is positive, indicating it can reduce H⁺ to H₂ gas.

Question 6

Choose the INCORRECT statement.

Accepted Answer

A strip of metal in a solution of ions of that metal is not an electrode potential. An electrode potential is the voltage difference between an electrode and its solution.

Question 7

In a galvanic cell,oxidation occurs at the cathode.

Accepted Answer

In a galvanic cell, oxidation occurs at the anode and reduction occurs at the cathode.

Question 8

In a galvanic cell,oxidation occurs at the:

Accepted Answer

In a galvanic cell, oxidation occurs at the anode. This is because the anode is the electrode that electrons flow out of, thereby oxidizing any reactants at that electrode.

Question 9

Corrosion of metals is an oxidation-reduction process.

Accepted Answer

Corrosion involves the transfer of electrons between the metal and the environment, which is an oxidation-reduction process.

Question 10

Choose the INCORRECT statement.

Accepted Answer

Half cells in a cell diagram are actually separated by a double vertical line.

Question 11

Choose the INCORRECT statement.

Accepted Answer

Electrolytic cells are cells where electron flow is caused by non-spontaneous reactions driven by an external power source such as a battery.

Question 12

The E_cell for the following concentration cell at 25 °C is 0.006 V. Pt ∣ H₂ (g,0.025 atm)∣ H⁺ (0.012 M) H⁺ (1 M)∣ H₂ (g,1 atm)∣ Pt 2 H⁺(aq)+ 2 e^- → H₂(g)E° = 0.V

Accepted Answer

The answer of The E_cell for the following concentration cell...

Question 13

Cathodic protection is attaching a more active metal to the protected metal.

Accepted Answer

Cathodic protection is the process of attaching a more active metal (known as a sacrificial anode) to the protected metal (known as the cathode) to decrease the rate of corrosion.

Question 14

A primary battery is recharged by passing electricity through the battery.

Accepted Answer

Primary batteries are not designed to be recharged. They are meant for one-time use and once the chemical reaction inside the battery is complete, the battery must be disposed of. Rechargeable batteries are also known as secondary batteries.

Question 15

E°_cell is the standard cell potential.

Accepted Answer

E°_cell refers to the standard cell potential, and therefore this statement is true.

Question 16

In the electrolysis of water,oxygen is evolved at the cathode.

Accepted Answer

Oxygen is evolved at the anode during the electrolysis of water, while hydrogen gas is evolved at the cathode.

Question 17

When E_cell < 0,the reaction is spontaneous.

Accepted Answer

The correct term for measuring spontaneity in a reaction is Gibbs free energy ($ \Delta G $), not $ E_cell $. A negative $ \Delta G $ indicates a spontaneous reaction. $ E_cell $ seems to be a typographical error and does not represent a known scientific term or formula.

Question 18

Choose the INCORRECT statement.

Accepted Answer

Reversing a half reaction does not necessarily make it a reduction potential. The direction of electron flow and the sign of the potential change when a half reaction is reversed, but whether it is a reduction or oxidation potential depends on the original reaction.

Question 19

The hydrogen standard electrode is the most convenient standard electrode to use.

Accepted Answer

The hydrogen standard electrode, while widely used as a reference, is not the most convenient due to the practical difficulties in maintaining the required conditions of pure hydrogen gas and a 1M H+ ion concentration. Other electrodes, like the silver/silver chloride electrode, are often considered more convenient for practical use.

Question 20

Primary batteries' cell reactions cannot be reversed.

Accepted Answer

Primary batteries use irreversible chemical reactions to produce electricity, meaning that once the chemicals are used up, the battery cannot be recharged or reused.

Quiz 19: Electrochemistry

Choose the INCORRECT statement.

In a zinc-lead cell the reaction is: Pb²⁺(aq) + Zn(s) → Pb(s) + Zn²⁺(aq) E° = 0.637 V Which of the following statements about this cell is FALSE?

The active metal is called a sacrificial cathode.

Choose the INCORRECT statement.

Choose the correct statement based on the following oxidation potentials. Mg/Mg²⁺ +2.37 v Fe/Fe²⁺ +0.44 v Cu/Cu²⁺ -0.34 v Zn/Zn²⁺ +0.76 v Sn/Sn²⁺ +0.14 v Ag/Ag⁺ -0.80 v

Choose the INCORRECT statement.

In a galvanic cell,oxidation occurs at the cathode.

In a galvanic cell,oxidation occurs at the:

Corrosion of metals is an oxidation-reduction process.

Choose the INCORRECT statement.

Choose the INCORRECT statement.

The E_cell for the following concentration cell at 25 °C is 0.006 V. Pt ∣ H₂ (g,0.025 atm)∣ H⁺ (0.012 M) H⁺ (1 M)∣ H₂ (g,1 atm)∣ Pt 2 H⁺(aq)+ 2 e^- → H₂(g)E° = 0.V

Cathodic protection is attaching a more active metal to the protected metal.

A primary battery is recharged by passing electricity through the battery.

E°_cell is the standard cell potential.

In the electrolysis of water,oxygen is evolved at the cathode.

When E_cell < 0,the reaction is spontaneous.

Choose the INCORRECT statement.

The hydrogen standard electrode is the most convenient standard electrode to use.

Primary batteries' cell reactions cannot be reversed.

Quiz 19: Electrochemistry

Choose the INCORRECT statement.

In a zinc-lead cell the reaction is: Pb2+(aq) + Zn(s) → Pb(s) + Zn2+(aq) E° = 0.637 V Which of the following statements about this cell is FALSE?

The active metal is called a sacrificial cathode.

Choose the INCORRECT statement.

Choose the correct statement based on the following oxidation potentials. Mg/Mg2+ +2.37 v Fe/Fe2+ +0.44 v Cu/Cu2+ -0.34 v Zn/Zn2+ +0.76 v Sn/Sn2+ +0.14 v Ag/Ag+ -0.80 v

Choose the INCORRECT statement.

In a galvanic cell,oxidation occurs at the cathode.

In a galvanic cell,oxidation occurs at the:

Corrosion of metals is an oxidation-reduction process.

Choose the INCORRECT statement.

Choose the INCORRECT statement.

The Ecell for the following concentration cell at 25 °C is 0.006 V. Pt ∣ H2 (g,0.025 atm)∣ H+ (0.012 M) H+ (1 M)∣ H2 (g,1 atm)∣ Pt 2 H+(aq)+ 2 e- → H2(g)E° = 0.V

Cathodic protection is attaching a more active metal to the protected metal.

A primary battery is recharged by passing electricity through the battery.

E°cell is the standard cell potential.

In the electrolysis of water,oxygen is evolved at the cathode.

When Ecell < 0,the reaction is spontaneous.

Choose the INCORRECT statement.

The hydrogen standard electrode is the most convenient standard electrode to use.

Primary batteries' cell reactions cannot be reversed.

In a zinc-lead cell the reaction is: Pb²⁺(aq) + Zn(s) → Pb(s) + Zn²⁺(aq) E° = 0.637 V Which of the following statements about this cell is FALSE?

Choose the correct statement based on the following oxidation potentials. Mg/Mg²⁺ +2.37 v Fe/Fe²⁺ +0.44 v Cu/Cu²⁺ -0.34 v Zn/Zn²⁺ +0.76 v Sn/Sn²⁺ +0.14 v Ag/Ag⁺ -0.80 v

The E_cell for the following concentration cell at 25 °C is 0.006 V. Pt ∣ H₂ (g,0.025 atm)∣ H⁺ (0.012 M) H⁺ (1 M)∣ H₂ (g,1 atm)∣ Pt 2 H⁺(aq)+ 2 e^- → H₂(g)E° = 0.V

E°_cell is the standard cell potential.

When E_cell < 0,the reaction is spontaneous.