Electrolysis

What is the chemical reaction that occurs during the electrolysis of water?

• 2H2O(l) -> 2H2(g) + O2(g)

• H2O(l) -> H2(g) + O(g)

• 2H2O(l) -> H2(g) + O(g)

• H2O(l) -> H2(g) + O2(g)

In the electrolysis of water, which gas is produced at the anode?

• Nitrogen

• Oxygen

• Carbon dioxide

• Hydrogen

At which electrode does reduction occur during the electrolysis of water?

• anode

• anion

• cathode

• positive electrode

What is the purpose of adding an electrolyte to water before electrolysis?

• To decrease conductivity and slow down the electrolysis process.

• To reduce the efficiency of the electrolysis process.

• To increase conductivity and improve efficiency of the electrolysis process.

• To add color to the water for visual appeal during electrolysis.

What is the overall reaction for the electrolysis of water?

• H2O(l) -> H2(g) + O2(g)

• 2H2O(l) -> 2H2(g) + O2(g)

• 2H2O(l) -> 2H(g) + O(g)

• 2H2O(l) -> H2(g) + O2(g)

What is the role of the electrolyte in the electrolysis of water?

• The electrolyte prevents the electrolysis of water

• The electrolyte changes the color of the water during electrolysis

• The electrolyte decreases the temperature required for electrolysis

• The role of the electrolyte in the electrolysis of water is to increase conductivity and facilitate the dissociation of water molecules.

What is the significance of using a DC power source in electrolysis?

• It ensures a constant flow of electrons in one direction.

• It increases the resistance in the circuit

• It speeds up the rate of electrolysis

• It allows for the flow of alternating current

How does the pH of the solution change during the electrolysis of water?

• The pH increases at the anode and decreases at the cathode.

• The pH decreases at the anode and increases at the cathode.

• The pH decreases at both the anode and cathode.

• The pH remains constant at both the anode and cathode.

What are the two half-reactions that occur during the electrolysis of water?

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

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

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

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

How can the efficiency of the electrolysis of water be improved?

• Decrease surface area of electrodes

• Use a more efficient electrolyte, increase surface area of electrodes, reduce resistance, and optimize voltage and current levels.

• Use a less efficient electrolyte

• Increase resistance