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notes gcse chemistry 4th form physics 5th form as p5 p1 p2 c1 c6 c5 c3 pupil work renewable energy 2r c4 prep as chemistry bonding 22 intermediates organic 23 intermolecular forces 27 equilibria alcohols waves satellites c2 optics unit 28 mechanisms halogenoalkanes unit 29 microwaves light 5th form pictures photography presentation shapes history 5th form lesson science photographs naming alkenes alkanes refraction momentum projectiles covalent 14 ionic equations of motion vectors dispersion communication