Potassium reacts with oxygen to form potassium oxide. Potassium oxide is a solid.
Complete the balanced equation for this reaction and add the state symbols.
………K(……… )+O2(g)→………K2O(……… ) \dots\dots\dots\text{K}(\dots\dots\dots) + \text{O}_2(\text{g}) \rightarrow \dots\dots\dots\text{K}_2\text{O}(\dots\dots\dots) ………K(………)+O2(g)→………K2O(………)外
230 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.