iGCSE Chemistry - Electrolysis

**This Powerpoint specifically uses the Cambridge iGCSE Chemistry Syllabus and covers all criteria for – Unit 4.1 Electrolysis
**
Students will be able to -

1 Define electrolysis as the decomposition of an
ionic compound, when molten or in aqueous
solution, by the passage of an electric current

2 Identify in simple electrolytic cells:
(a) the anode as the positive electrode
(b) the cathode as the negative electrode
© the electrolyte as the molten or aqueous
substance that undergoes electrolysis

3 Identify the products formed at the electrodes
and describe the observations made during the
electrolysis of:
(a) molten lead(II) bromide
(b) concentrated aqueous sodium chloride
© dilute sulfuric acid
using inert electrodes made of platinum or
carbon/graphite

4 State that metals or hydrogen are formed at
the cathode and that non-metals (other than
hydrogen) are formed at the anode

5 Predict the identity of the products at each
electrode for the electrolysis of a binary
compound in the molten state

6 State that metal objects are electroplated to
improve their appearance and resistance to
corrosion

7 Describe how metals are electroplated

8 Describe the transfer of charge during
electrolysis to include:
(a) the movement of electrons in the external
circuit
(b) the loss or gain of electrons at the
electrodes
© the movement of ions in the electrolyte

9 Identify the products formed at the electrodes
and describe the observations made during the
electrolysis of aqueous copper(II) sulfate using
inert carbon/graphite electrodes and when
using copper electrodes

10 Predict the identity of the products at each
electrode for the electrolysis of a halide
compound in dilute or concentrated aqueous
solution

11 Construct ionic half-equations for reactions
at the anode (to show oxidation) and at the
cathode (to show reduction)

**Every Powerpoint includes learning objectives, a starter and plenary, suitable activities and review questions with mark scheme. We also provide a FREE pdf version of the file so it can easily be printed for students as a handout or uploaded to the school VLE system
**
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