AQA Chemistry Electrolysis Quiz

What is electrolysis?

• Separation of substances using heat

• Decomposition of a compound using electricity

• Combining elements using electricity

• Separation of mixtures using filtration

Which type of substances can undergo electrolysis?

• Covalent compounds

• Ionic compounds in molten or aqueous form

• Metallic compounds

• Gases

What are the electrodes in electrolysis typically made from?

• Plastic

• Copper

• Graphite or inert metal

• Glass

Why can't solid ionic compounds be electrolysed?

• They are too reactive

• They are insoluble

• Their ions are not free to move

• They conduct too much electricity

In electrolysis, where do cations move?

• Toward the anode

• Toward the cathode

• They stay in place

• To both electrodes

What charge does the anode have?

• Positive

• Negative

• Neutral

• Alternating

What happens to positive ions at the cathode?

• They are oxidised

• They are reduced

• They react with water

• They form new compounds

What process occurs at the anode?

• Oxidation

• Reduction

• Neutralisation

• Precipitation

Which ion is discharged at the anode during electrolysis of molten NaCl?

• Na⁺

• Cl⁻

• OH⁻

• H⁺

What is the product at the cathode during electrolysis of molten NaCl?

• Chlorine

• Sodium

• Hydrogen

• Oxygen