Predict the products of electrolysis
10th grade (Year 11 in England) · 16 questions · Common Core: NGSS.HS-PS1-2 · England: GCSE Combined Science: Chemical changes (electrolysis)
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Question 1
Electrolysis of potassium bromide solution: what forms at the anode (positive electrode)?
- A. oxygen
- B. hydrogen
- C. bromine
- D. sulfur
Question 2
Electrolysis of copper(II) sulfate solution: what forms at the cathode (negative electrode)?
- A. sodium
- B. oxygen
- C. hydrogen
- D. copper
Question 3
Electrolysis of water using renewable electricity makes "green hydrogen". Why is it seen as a low-carbon fuel?
- A. Hydrogen is green in colour
- B. It absorbs carbon dioxide as it burns
- C. Burning hydrogen produces only water, and the electricity came from renewable sources
- D. It is made from coal
Question 4
Electrolysis of copper(II) chloride solution: what forms at the anode (positive electrode)?
- A. chlorine
- B. oxygen
- C. hydrogen
- D. sulfur
Question 5
Electrolysis of aluminium oxide dissolved in molten cryolite: what forms at the cathode (negative electrode)?
- A. oxygen
- B. zinc
- C. copper
- D. aluminium
Question 6
Electrolysis of water using renewable electricity makes "green hydrogen". Why is it seen as a low-carbon fuel?
- A. It is made from coal
- B. It absorbs carbon dioxide as it burns
- C. Burning hydrogen produces only water, and the electricity came from renewable sources
- D. Hydrogen is green in colour
Question 7
Electrolysis of copper(II) chloride solution: what forms at the anode (positive electrode)?
- A. sulfur
- B. chlorine
- C. bromine
- D. oxygen
Question 8
Electrolysis of molten zinc chloride: what forms at the cathode (negative electrode)?
- A. zinc
- B. hydrogen
- C. aluminium
- D. oxygen
Question 9
Why is extracting aluminium by electrolysis so expensive?
- A. Aluminium ore is very rare
- B. It needs huge amounts of electricity to melt the ore and drive the reaction
- C. The electrodes are made of gold
- D. Aluminium is less reactive than carbon
Question 10
Electrolysis of aluminium oxide dissolved in molten cryolite: what forms at the anode (positive electrode)?
- A. bromine
- B. sulfur
- C. oxygen
- D. hydrogen
Question 11
Electrolysis of sodium chloride solution (brine): what forms at the cathode (negative electrode)?
- A. aluminium
- B. oxygen
- C. copper
- D. hydrogen
Question 12
Electrolysis of water using renewable electricity makes "green hydrogen". Why is it seen as a low-carbon fuel?
- A. It is made from coal
- B. Burning hydrogen produces only water, and the electricity came from renewable sources
- C. It absorbs carbon dioxide as it burns
- D. Hydrogen is green in colour
Question 13
Electrolysis of aluminium oxide dissolved in molten cryolite: what forms at the anode (positive electrode)?
- A. oxygen
- B. bromine
- C. sulfur
- D. hydrogen
Question 14
Electrolysis of potassium bromide solution: what forms at the cathode (negative electrode)?
- A. hydrogen
- B. oxygen
- C. sodium
- D. zinc
Question 15
Why must an ionic solid be melted or dissolved before electrolysis?
- A. to cool it down
- B. so the ions can move to the electrodes
- C. so electrons can flow through the liquid
- D. to make it covalent
Question 16
Electrolysis of copper(II) sulfate solution: what forms at the anode (positive electrode)?
- A. bromine
- B. chlorine
- C. oxygen
- D. sulfur
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