Introduction to electrolysis

Electrolysis : an introduction

A very arduous chemical reaction is possible to happen by means of electrical current

Learning by Answering

You have 60 seconds or 2 minutes alloted time to answer each question

Multiple Choice

What will be the best statements describing "electrolysis"?

• Decomposition of a compound into its element by an electric current

• the process of generating electricity due to a spontaneously-redox reaction

Electrolysis cell

Electrolysis is carried out on an apparatus called electrolysis cell. The right picture shows the components of electrolysis cell

Multiple Choice

What is the components of an electrolytic cells pointed out by A?

• Electrode

• Electrolyte

• Power supply

• Salt-bridge

Multiple Select

Electrolyte play an essensial part as to engage in redox reaction at the surface of electrode and assist electrons to move freely so that electron transfer can be more efficient and faster. Choose the compounds that is suitable for an electrolyte. (You may choose more than one answer)

• Molten ionic compound

• molten non-ionic compound

• Aqueous ionic solution

Multiple Choice

Components pointed out by B and C in the picture can conduct electricity, Enabling electrical current to move throughout the cell. What will be the name of the components?

• Electrolyte

• Power supply

• Electrodes

• Salt bridge

Electrode consists of two main components

• Cathode (−) : reduction

• Anode (+) : oxidation

Multiple Select

Which of the following are the characteristic of cathode?

(you may choose more than one answer)

• Positive electrode

• Negative electrode

• Oxidation of ions/compounds occur here

• Reduction of ions/compounds occurs here

• Electrons are produced in this electrode

Multiple Select

Which of the following are the characteristic of anode?

(you may choose more than one answer)

• Reduction of ions/compounds occur here

• Positive electrode

• Negative electrode

• Oxidation of ions/compounds occur here

• Electrons are produced in this electrode

Multiple Choice

How does electrons flow in electrolysis cell?

• It flows from the negative electrode (cathode) to the positive electrode (anode)

• It flows from the positive electrode (anode) to the negative electrode (cathode)

Multiple Choice

Power supply works as external voltage to supply electrical current during electrolysis. Which one at the picture represent power supply as source of electricity in electrolysis?

• A

• B

• C

• D

Multiple Choice

Electrolysis can still occurs even though the electrolytic cell have no power supply in its components.

• True

• False

Electrolysis simulation

To figure out what happens during electrolysis, let's look at the simulation of electrolysis of water provided by the teacher. Then answer the following question.

Multiple Choice

What is the half-reaction of reduction taking place at the cathode?

• 4OH⁻ → O₂ + 2H₂O + 2e⁻

• 4H₂O + 2e⁻ → 4OH⁻ + 2H₂

• 4H₂O + 2e⁻ → 4OH⁻ + 2H₂ + 2e⁻

• 4OH⁻ + 2e⁻ → O₂ + 2H₂O

Multiple Choice

What is the half-reaction of reduction taking place at the anode?

• 4H₂O + 2e⁻ → 4OH⁻ + 2H₂

• 4OH⁻ + 4e⁻ → O₂ + 2H₂O

• 4OH⁻ → O₂ + 2H₂O + 4e⁻

• 4H₂O → 4OH⁻ + 2H₂ + 2e⁻