Master Topic C4 of OCR Gateway Combined Science A (J250): the reactivity series of metals, displacement reactions and redox, the properties and reactivity trends of Group 1 (the alkali metals) and Group 7 (the halogens), and predicting chemical reactions from reactivity. Worked examples, exam tips and Mid/Stronger/Top-band model answers for the Foundation and Higher tiers. (Chemical tests to identify gases and ions, flame tests and instrumental methods are separate-science only and are not covered in Combined Science.)
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