36:51

A2 Chemistry Amino Acids and Electrophoresis 1

32:15

A2 Nitrogen organic compounds 4

20:27

A2 Organic Chemistry

37:11

Thin Layer Chromatography

18:20

kpc

39:43

A2 Carboxyllic acids 3

31:32

A2 Nitrogen organic compounds 2

35:18

A2 Nitrogen organic compounds 1