AQA Chemistry Complete PPT Package Quantitative Chemistry (includes lots of GCSE style Q's)
An 'All Together' PPT that makes teaching this tricky area of Chemistry feel like a walk in the park (especially suitable for non specialists).
Plus lots of extra more specific activities.
4 Hours worth of material
Includes: Ar/Mr, Empirical Formula, Reacting Masses, Percentage Yield and Atom Economy.