Chemistry · GCSE
What Reacts, and Which Way the Electrons Go
Why a dilute strong acid is not the same as a concentrated weak one, and how you know what appears at each electrode. Acids, alkalis and pH drawn against hydrogen-ion concentration; the reactivity series in full, with carbon and hydrogen placed in it; electrolysis of melts and solutions; four gas tests and the observation that earns the mark; balancing an equation the way that always works, state symbols included. Ten terms to define, a model answer on strong versus concentrated, and the misconceptions that cost marks.

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