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A scientist wants to make silver using electrolysis. They consider two different electrolysis experiments using inert electrodes as shown in the table:

Experiment 1Experiment 2
Electrolytemolten silver chloridesilver nitrate solution
Electrode the scientist collects product fromanodecathode
a.

Predict and explain what will be made at the electrode the scientist collects the product from in each experiment. Determine which experiment the scientist should use to make silver.

[3]
b.

Another scientist investigates the electrolysis of zinc iodide.

The diagram shows their experiment:

A schematic diagram of an electrolysis setup. Inside a glass beaker, there is a pile of circular grains representing solid zinc iodide at the bottom. Two thick vertical rod electrodes, labeled "Anode" (on the left, connected to a positive + terminal) and "Cathode" (on the right, connected to a negative - terminal), are hanging above the solid pile. The bottoms of the electrodes do not touch the solid zinc iodide. No heating device is present. Labels: Anode, Cathode, Solid zinc iodide.

The experiment does not make any zinc.

State two changes the scientist should make so that zinc is made.

[2]
c.

Complete the balanced half equation for the production of iodine from iodide ions.

2I−−……………→……………2\text{I}^- - \text{\dots\dots\dots\dots\dots} \rightarrow \text{\dots\dots\dots\dots\dots}2I−−……………→……………

[1]

Electrolysis Questions

Practise OCR GCSE Chemistry Electrolysis with exam-style questions for Foundation and Higher tier. 45 questions, matched to the OCR GCSE Chemistry (J248) specification and written in Paper 1 and Paper 2 (Foundation Tier) or Paper 3 and Paper 4 (Higher Tier) style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.

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Electrolysis Questions

  1. GCSE
  2. /Chemistry
  3. /Electrolysis