10 questions🇬🇧English
🔌 Electrolysis – GCSE
Chemistry · GCSE — electrodes, products of molten and aqueous electrolysis, half equations and aluminium
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Questions
What is an electrolyte?
An ionic compound that is molten or dissolved
A metal that conducts electricity well
A covalent liquid such as ethanol
An ionic compound in its solid state
20s
In electrolysis, what is the name of the negative electrode?
Anion
Electrolyte
Anode
Cathode
20s
Molten lead bromide is electrolysed. Which product forms at the cathode?
Bromine
Hydrogen
Lead
Oxygen
20s
Using OIL RIG, what happens to ions at the anode during electrolysis?
Reduction – the ions lose electrons
Oxidation – the ions gain electrons
Reduction – the ions gain electrons
Oxidation – the ions lose electrons
30s
Aqueous sodium chloride solution is electrolysed. Which product forms at the cathode?
Oxygen
Sodium
Chlorine
Hydrogen
30s
Copper(II) sulfate solution is electrolysed with inert electrodes. Which product forms at the anode?
Sulfur
Oxygen
Copper
Hydrogen
30s
Why is aluminium oxide dissolved in molten cryolite before electrolysis?
To act as a catalyst for the reaction
To lower the melting point and save energy
To make the aluminium more reactive
To stop the carbon anodes wearing away
30s
Which half equation shows what happens at the cathode during aluminium extraction?
Al³⁺ → Al + 3e⁻
Al³⁺ + 3e⁻ → Al
Al → Al³⁺ + 3e⁻
Al³⁺ + e⁻ → Al
30s
In the extraction of aluminium, why must the carbon anodes be replaced regularly?
Aluminium coats the anodes and blocks them
Aluminium ions reduce the carbon anodes
The carbon dissolves into the cryolite
Oxygen reacts with the carbon to form CO₂
30s
Which is the correct half equation for the reaction at the anode when chlorine is produced?
2Cl⁻ → Cl₂ + 2e⁻
Cl₂ + 2e⁻ → 2Cl⁻
2Cl⁻ + 2e⁻ → Cl₂
Cl⁻ → Cl₂ + e⁻
30s