GCSE 2.7 Electrochemistry

What does the term "electrolysis" refer to?

• The decomposition of a liquid electrolyte using a direct current of electricity.

• The process of dissolving a solid in a liquid.

• The formation of a solid from a solution.

• The movement of electrons in a conductor.

Which of the following is an example of an inert electrode?

• Copper

• Graphite

• Zinc

• Iron

What is the role of the cathode in electrolysis?

• It is the positive electrode.

• It is the negative electrode.

• It is an unreactive material.

• It is the electrolyte.

Which of the following statements is true about the anode in electrolysis?

• It is the negative electrode.

• It is the positive electrode.

• It is an unreactive material.

• It is the electrolyte.

What is an electrolyte?

• A solid that conducts electricity.

• An ionic compound that is molten or dissolved in water that conducts electricity and is decomposed by it.

• A gas that conducts electricity.

• A metal that conducts electricity.

What is the observation at the anode during the electrolysis of Lead(II) bromide?

• Yellow-green vapour, pungent smell

• Red-brown vapour, pungent smell

• Silver grey metallic bead

• No observable change

What is the half equation at the cathode for the electrolysis of Lithium chloride?

• 2Br⁻ → Br₂ + 2e⁻

• Pb²⁺ + 2e⁻ → Pb

• 2Cl⁻ → Cl₂ + 2e⁻

• Li⁺ + e⁻ → Li

Which ions are attracted to the cathode during electrolysis?

• Anions

• Cations

• Neutrons

• Electrons

What is the process called when ions gain electrons to form atoms or molecules?

• Oxidation

• Reduction

• Ionization

• Electrolysis

What is the observation at the cathode during the electrolysis of Lead(II) bromide?

• Yellow-green vapour, pungent smell

• Red-brown vapour, pungent smell

• Silver grey metallic bead

• No observable change