UNIT OVERVIEW

This revision unit helps you consolidate the main chemistry topics from Grade 11 Term 4 and prepare for your final examinations.

What you will revise:

• Acid-base reactions: definitions, conjugate pairs, pH calculations, and titrations
• Redox reactions: oxidation numbers, electron transfer, and balancing equations
• The lithosphere: Earth's structure, gold mining, coal, and environmental impacts
• Mixed problems that combine these concepts
• Exam-style questions with model answers

Why these topics matter:

• Acid-base chemistry: Farmers neutralise acidic soil with lime. Your blood maintains a pH between 7.35 and 7.45 to keep you healthy.
• Redox reactions: Batteries, rusting metal, and bleach all involve electron transfer.
• The lithosphere: South Africa's gold and coal mining industries employ thousands and contribute billions to the economy.

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