20 - Materials

21 - Elements & Compounds

22 - Solutions

23 - Separating Mixtures

24 - Acids and Bases 1

25 - The Air and Oxygen

26 - Carbon Dioxide

27 - Water

28 - Acids and Bases 2

29 - Atomic Structure

30 - The Periodic Table

31 - Chemical Bonding

32 - Chemical Equations

33 - Metals and Plastics