Balance the equation for the reaction of calcium with oxygen to form calcium oxide.
………Ca+………O2→………CaO \dots\dots\dots \text{Ca} + \dots\dots\dots \text{O}_2 \rightarrow \dots\dots\dots \text{CaO} ………Ca+………O2→………CaO230 exam-style questions on Edexcel GCSE Chemistry 1.1 Formulae, equations and hazards, covering 1.1.1 Formulae, word and balanced equations, 1.1.2 Balanced ionic equations, and 1.1.3 Hazard symbols and risk in practical work. Each one has a worked solution and a mark scheme showing where the marks go.