Passing electricity through compounds: electrolysis
3 marks · NormalThe diagram below represents an electrolytic cell with a solution of sodium chloride ( ) and two electrodes.
Name the electrode where reduction occurs.
Give the name and charge of the ions that move to the anode in this process.
State the term used for the substance, other than electrodes, that is necessary for electrolysis to occur in this experiment.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
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(a) cathode
(b) chloride ions, negative charge (Cl⁻)
(c) electrolyte
Also accept: Cathode for (a); Chloride or Cl⁻ for (b)
Common mistakes: confusing anode and cathode; wrong direction of ion movement
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Marking points
B1 (a) · 1 mark · States cathode as the electrode where reduction occurs
B1 (b) · 1 mark · Correctly states chloride (Cl⁻) ions with negative charge
B1 (c) · 1 mark · Correctly names electrolyte as the required substance
Worked solution
a) The cathode is where reduction takes place.
b) Chloride ions (Cl⁻), which are negative, move to the anode.
c) The electrolyte is the solution in which ions are free to move and electrolysis occurs.