Unit 3 AOS 2 - Electrolytic Cells (3) Quiz

What is the process of electrolysis?

• Using an electric current to drive a non-spontaneous chemical reaction

• Using a magnetic field to drive a spontaneous chemical reaction

• Heating a substance to cause a chemical change

• Mixing two chemicals to create a new compound

Explain the concept of overpotential in the electrolysis process.

• The potential required to speed up the reaction in an electrolytic cell

• The potential required to reverse the reaction in an electrolytic cell

• The potential required to stop the reaction in an electrolytic cell

• The extra potential required to drive the reaction at the desired rate in an electrolytic cell.

What are some common applications of electroplating?

• Decorative purposes, corrosion prevention, wear resistance, creating smooth surface

• Building materials

• Cooking utensils

• Medical equipment

How is electroplating used in the automotive industry?

• To provide better traction on the road

• To power the engine

• To coat metal parts with a thin layer of another metal for improved appearance and corrosion resistance.

• To improve fuel efficiency

Describe the setup of an electrolytic cell.

• An electrolytic cell consists of a single electrode immersed in a solution, without any external power source.

• An electrolytic cell consists of two electrodes (anode and cathode) immersed in an electrolyte solution, connected to an external power source (battery or power supply).

• An electrolytic cell consists of two electrodes immersed in an electrolyte solution, connected to a solar panel.

• An electrolytic cell consists of two electrodes immersed in a dry environment, without any external power source.

What are the key components of an electrolytic cell?

• a beaker, a spoon, and a fork

• a battery, a wire, and a light bulb

• an electrolyte, an anode, and a cathode

• a plant, soil, and water

What is the electrochemical series and how is it used in electrolytic cells?

• It is a list of elements arranged in order of their standard electrode potentials and is used to determine the feasibility of a redox reaction and predict the direction of electron flow.

• It is a list of elements arranged in order of their atomic numbers and is used to determine the color of a solution.

• It is a list of isotopes arranged in order of their radioactivity and is used to determine the stability of a nuclear reaction.

• It is a list of compounds arranged in order of their solubility and is used to determine the concentration of ions in a solution.

Explain the significance of the standard electrode potential in the electrochemical series.

• It helps in predicting the direction of redox reactions and the feasibility of a reaction.

• It is only relevant in theoretical studies and not practical applications

• It only applies to non-redox reactions

• It has no significance in electrochemical reactions

Write the half equation for the electrolysis of water.

• H2O(l) -> H2(g) + 2OH-(aq)

• 2H2O(l) -> O2(g) + 2H+(aq) + 2e-

• 2H2O(l) -> O2(g) + 4H+(aq) + 4e- + 2H2O(l) -> 2OH-(aq) + H2(g)

• 2H2O(l) -> O2(g) + 2H+(aq) + 2e- + H2O(l) -> 2OH-(aq) + H2(g)

Provide the half equation for the electrolysis of copper(II) sulfate solution.

• Cu2+ + 2e- -> Cu2+

• Cu2+ + 2e- -> CuO

• Cu2+ + 2e- -> Cu

• Cu2+ + 2e- -> CuSO4