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GCSE chemistry - PAPER 1 – Electrolysis Questions with Accurate Answers, Exams of Inorganic Chemistry

London Institute of Business and Technology (LIBT)Inorganic Chemistry

GCSE chemistry - PAPER 1 – Electrolysis Questions with Accurate Answers

Typology: Exams

2024/2025

Available from 06/03/2025

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GCSE chemistry - PAPER 1 – Electrolysis Questions with
Accurate Answers
What is electrolysis? (3) correct answer - the process of passing a current through ionic substances
- that are molten or in a solution
- to break them into elements
an ionic compound can conduct when correct answer Molten or in a solution
What is the electrolyte? correct answer the molten or aqueous ionic substance that's broken down into
elements by electrolysis
what happens at the electrodes correct answer Ions become neutral
What happens to anions (negative ions)? correct answer they lose electrons (get oxidised) at the anode
to become neutral to form their original element
What happens to cations (positive ions)? correct answer They gain electrons (get reduced) at the
cathode to become neutral to form their original element
What is oxidation? correct answer Loss of electrons
What is reduction? correct answer gain of electrons
what charge does the cathode have? correct answer Negative
what charge does the anode have? correct answer positive
What happens at the cathode? correct answer cations(positive ions) are attracted and reduced to
become neutral
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GCSE chemistry - PAPER 1 – Electrolysis Questions with

Accurate Answers

What is electrolysis? (3) correct answer - the process of passing a current through ionic substances

  • that are molten or in a solution
  • to break them into elements an ionic compound can conduct when correct answer Molten or in a solution What is the electrolyte? correct answer the molten or aqueous ionic substance that's broken down into elements by electrolysis what happens at the electrodes correct answer Ions become neutral What happens to anions (negative ions)? correct answer they lose electrons (get oxidised) at the anode to become neutral to form their original element What happens to cations (positive ions)? correct answer They gain electrons (get reduced) at the cathode to become neutral to form their original element What is oxidation? correct answer Loss of electrons What is reduction? correct answer gain of electrons what charge does the cathode have? correct answer Negative what charge does the anode have? correct answer positive What happens at the cathode? correct answer cations(positive ions) are attracted and reduced to become neutral

What happens at the anode? correct answer Anions(negative ions) are attracted and oxidized to become neutral What happens to negative ions (anions) during electrolysis of molten compounds? correct answer oxidized to form their original element what happens to positive ions(Cations) during electrolysis of molten compounds? correct answer Reduced to form their original element what shows you what happens at one of the electrodes during electrolysis? correct answer Half equations (gains or loses electrons) What does the half equation for the cathode look like? correct answer Al3+ + 3e- → Al (reduction - gaining electrons) What does the half equation for the anode look like? correct answer 2O2- → O2 + 4e- (oxidization - loss of electrons) Why is aluminum oxide mixed with cryolite when extracting aluminum? (3) correct answer - lower temperature

  • therefore lower energy
  • so lower cost what are electrodes usually made out of? correct answer Graphite Why are electrodes often made of graphite? (3) correct answer - it's insoluble in water
  • a good conductor of electricity
  • high melting point What happens during the electrolysis of a solution? (Compared to molten) correct answer Some H+ and OH- ions are formed
  • measure the end mass of each of the electrodes
  • repeat the experiment with new electrodes Is a question says with observations... correct answer - Don't say what the metal is, just describe the colour(orangy-brown metal)
  • Don't say what the gas is, just say that you can see bubbles Does the anode gain or lose mass and why? correct answer - loses mass
  • because the metal dissolves Does the cathode gain or lose mass and why? correct answer - gains mass
  • because the metal is deposited onto the cathode Cell A
  • at the cathode Cu2+ + 2e⁻ ----> Cu, so some copper is deposited onto the cathode
  • at the anode 4OH⁻ ---->2H₂O + O₂ + 4e⁻
  • so some gas is lost through bubbles
  • so mass is lost Cell B
  • at the cathode Cu2+ + 2e⁻ ----> Cu
  • at the anode Cu ---> Cu²⁺ + 2e⁻
  • as the mass lost from the anode will equal the mass gained by the cathode
  • so the mass will stay the same correct answer Both cells are turned on and left for 1 hour. Given that the masses of the two cells were the same at the start of the electrolysis, how would you expect them to compare after 1 hour. Explain your answer + use appropriate half equations in your answer. Where does reduction occur? correct answer cathode Where does oxidation occur? correct answer anode