Master Topic C2 of OCR Gateway Combined Science A (J250): elements, compounds and mixtures, separating mixtures, chromatography and Rf values, the periodic table and group trends, ionic bonding, covalent bonding and small molecules, and giant structures and metallic bonding. Worked examples, exam tips and Mid/Stronger/Top-band model answers for the Foundation and Higher tiers. (Transition metals and nanoparticles are separate-science only and are not covered.)
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