Electrolysis
15 review questions with answers for Electrolysis. Read them here, or play the set as a class game on the projector. Free to host, and students join with a code.
Decomposing a molten or dissolved ionic compound using a direct current?
- ElectrolysisRight answer
- Distillation
- Combustion
- Neutralisation
What this set covers
Electrolysis of molten and dissolved ionic compounds, with the electrodes and ions that go with them. Examples include molten PbBr₂, brine, aluminium extraction with cryolite, copper deposition, and the link between reduction and gain of electrons.
- Common mix-up
- Students often mix up the cathode and the anode: positive cations move to the negative cathode, where they gain electrons, and the anions move to the positive anode.
- Review tip
- Draw a labeled cell for molten lead bromide, mark which ions travel where, and write the half-equation at each electrode.
All 15 questions and answers
Decomposing a molten or dissolved ionic compound using a direct current?
Answer: Electrolysis
Negative electrode?
Answer: Cathode
Positive electrode?
Answer: Anode
Molten or dissolved ionic compound that is broken down?
Answer: Electrolyte
Name for positive ions, which move to the negative electrode?
Answer: Cations
An ionic compound must be molten or dissolved so its ions are…?
Answer: Free to move
Product at the cathode when molten PbBr₂ is electrolysed?
Answer: Lead
Product at the anode when molten PbBr₂ is electrolysed?
Answer: Bromine
Gas formed at the cathode when brine (concentrated NaCl solution) is electrolysed?
Answer: Hydrogen
Gas formed at the anode when brine is electrolysed?
Answer: Chlorine
Solution left after brine is electrolysed?
Answer: Sodium hydroxide
Metal extracted by electrolysing its molten oxide dissolved in cryolite?
Answer: Aluminium
Carbon anodes in aluminium extraction wear away because they react with…?
Answer: Oxygen
Half-equation at the cathode when copper is deposited from Cu²⁺ ions?
Answer: Cu²⁺ + 2e⁻ → Cu
Gain of electrons at the cathode?
Answer: Reduction
Play it as a class game
Play this set opens it in splycr, where you can host it for your class straight away. Hosting needs no account: put the room code on the projector, and students join from a phone with the code and their first name. Each question plays as multiple choice, and the three wrong options were written for that question.