C5 Molten electrolysis

What is the product formed at the cathode during the electrolysis of molten magnesium fluoride?

• magnesium
• hydrogen
• fluorine
• oxygen

Describe oxidation in terms of electrons

• oxidation is gain of electrons
• oxidation is loss of electrons

Describe reduction in terms of electrons

• reduction is gain of electrons
• reduction is loss of electrons

Why can ionic compounds not conduct electricity when they are solid?

• their electrons are not free to move
• their ions are free to move
• their ions are not free to move
• their electrons are free to move

What type of charge does a metal ion have?

• +
• -

What is the equation to show what happens to chloride ions at the anode.

• Cl^- → Cl + e-

• 2Cl^- → Cl₂ + 2e-

• Cl₂ + 2e- → 2Cl^-

• Cl + 2e- → 2Cl^-

Choose the half-equation that shows the discharge of aluminium ion.

• Al³⁺ - 3e^- → Al

• Al²⁺ + 3e^- → Al

• Al³⁺ + 3e^- → Al

• Al³⁺ → Al + 3e^-

What are the ions present in molten Al₂O₃?

• Al²⁺ and O^3-

• Al^2- and O³⁺

• Al³⁺ and O^2-

• Al^3- and O²⁺

What would the charges be on the ions that make up NaCl?

• Na⁺ and Cl^-
• Na^- and Cl⁺
• Na^₊ and Cl^_-

When NaCl solution is electrolysed what has forms at the anode?

• Hydrogen
• Oxygen
• Chlorine
• Sodium