What you'll learn
Measuring amounts and controlling reactions.
Amounts
- Relative formula mass and the mole (moles = mass ÷ Mr).
- Concentration (g/dm³ or mol/dm³) and titrations.
- Percentage yield.
Rates
- Factors affecting rate: temperature, concentration, surface area, catalysts (collision theory).
Exam tips
- Show the mole calculation clearly.
- Explain rate changes using collision frequency and energy.
Common mistakes
- Using mass instead of moles in ratios.
- Forgetting a catalyst is not used up.