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Chemistry /
YEAR 12 · UNIT 3

Find the balance.

From a changing equilibrium to moving electrons. Choose a syllabus point, or jump straight into practice.

01
TOPIC 1

Chemical equilibrium systems

Reversible reactions, acids, bases and the balance between them.

01

Dynamic equilibrium

Still changing. Staying the same.

Practise
02

Le Châtelier’s principle

Give the balance a nudge.

Practise
03

Reversibility and activation energy

Over the energy hill.

Practise
04

Kc and the reaction quotient

Which way will it go?

Practise
05

Ksp and precipitation

When a solid appears.

Practise
06

Brønsted–Lowry acids and bases

Follow the proton.

Practise
07

pH, pOH and Kw

One step. Ten times.

Practise
08

Ka, Kb and pKa

Small constant. Useful prediction.

Practise
09

Buffers and indicators

Resist the change. Reveal the change.

Practise
10

Volumetric analysis

Every drop counts.

Practise
Try related past-paper questions
02
TOPIC 2

Oxidation and reduction

Follow electrons from half-equations to working cells.

01

Oxidation numbers and half-equations

Keep track of every electron.

Practise
02

Galvanic cells

A reaction you can plug into.

Practise
03

Standard electrode potentials

Will the reaction run?

Practise
04

Electrolysis and Faraday calculations

Make a reaction run uphill.

Practise
Try related past-paper questions
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