Things from chemistry unit 1/2 you will need to specifically know for unit 3/4

[sugandi]

Hello everyone,

I was just wondering what topics/stuff do we need to know from Unit 1/2 Chemistry that is assumed knowledge in Units 3/4. Or even topics/information that is especially helpful to know for Unit 3/4

Good luck to everyone with their exams! 

[jyce]

Off the top of my head, bonding (e.g. hydrogen, ionic), calculations of amounts of gases, solids, etc., empirical and molecular formulae, naming organic molecules, pH basics...