chemistryRP3 · Chemical ChangesPaper 1Combined and Separate

Electrolysis of aqueous solutions

Method overview

Set up inert electrodes in an aqueous ionic solution without touching, connect to DC supply, collect gases or observe deposits, and test products safely. Record electrode polarity and observations.

Apparatus set-up

Diagram

electrolyte; inert electrodes; power supply; leads; test tubes; splints; indicator paper

Independent variable

electrolyte identity/concentration or electrode material

Dependent variable

products at anode and cathode; observations

Control variables

voltage/current; electrode area/distance; time; solution volume

Apparatus

electrolyte; inert electrodes; power supply; leads; test tubes; splints; indicator paper

Safety

Wear eye protection; use low-voltage DC; gases may be flammable/toxic; test small volumes away from the cell.

Scientific rationale

Ions move to oppositely charged electrodes; reduction occurs at cathode and oxidation at anode; products depend on ion reactivity and solution composition.

You will work through 12 questions across four layers — Core, Deepen, Exam and Transfer Challenge. Hints reveal in two stages, and the model answer only appears once you ask for it. Mark yourself honestly at each question so your mastery-by-skill breakdown stays accurate.