UNIT OVERVIEW

This revision unit brings together the key ideas from Term 3. You have learned to work with chemical quantities using the mole concept, describe motion using physics equations, and understand water systems.

What you will revise:

Chemistry:

• The mole concept and Avogadro's number
• Molar mass calculations and conversions (moles ↔ mass ↔ particles)
• Stoichiometric calculations using balanced equations
• Limiting reagents and percentage yield

Physics:

• Vectors and scalars
• Adding vectors in one dimension
• Displacement, velocity, and acceleration
• Motion graphs and equations of motion

Water Systems:

• The water cycle
• Properties of water
• Water quality testing and purification

Why these ideas matter:

• Pharmacists use mole calculations to measure exact amounts of medicine
• Traffic engineers use motion equations to set safe speed limits and braking distances
• Water treatment plants test for the same ions you have studied to keep drinking water safe

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