Aluminium reacts with oxygen to form aluminium oxide, Al2O3\text{Al}_2\text{O}_3Al2O3. Which is the balanced equation for this reaction?
Al+O2→AlO2\text{Al} + \text{O}_2 \rightarrow \text{AlO}_2Al+O2→AlO2
2Al+3O2→Al2O32\text{Al} + 3\text{O}_2 \rightarrow \text{Al}_2\text{O}_32Al+3O2→Al2O3
2Al+O3→Al2O32\text{Al} + \text{O}_3 \rightarrow \text{Al}_2\text{O}_32Al+O3→Al2O3
4Al+3O2→2Al2O34\text{Al} + 3\text{O}_2 \rightarrow 2\text{Al}_2\text{O}_34Al+3O2→2Al2O3
39 exam-style questions on AQA GCSE Chemistry 4.1 Reactivity of metals, covering 4.1.1 Metal oxides, 4.1.2 The reactivity series, 4.1.3 Extraction of metals and reduction, and 4.1.4 Oxidation and reduction in terms of electrons. Each one has a worked solution and a mark scheme showing where the marks go.