Who? For those teaching the new Chemistry/ Combined Science GCSE (2016). Also for those of you requiring a straightforward and simple lesson on calculating relative formula mass and discovering how to deduce empirical formula using the molecular formula of a compound.
What? This is a whole lesson on one powerpoint. A starter mass quiz, Learning objectives, worked examples with answers, class tasks with answers (differentiated up to challenge your more able), exam questions with markschemes to share with your group. This lesson is ready to go but still offers you flexibility to offer group work or peer teaching style tasks if you wish.