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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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Score/ 16

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

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