Which equation represents sodium reacting with water?
2Na+2H2O→2NaOH+H2\mathrm{2Na+2H_2O\rightarrow2NaOH+H_2}2Na+2H2O→2NaOH+H2
4Na+O2→2Na2O\mathrm{4Na+O_2\rightarrow2Na_2O}4Na+O2→2Na2O
Na+H2O→NaO+H2\mathrm{Na+H_2O\rightarrow NaO+H_2}Na+H2O→NaO+H2
2Na+2H2O→2NaOH+O2\mathrm{2Na+2H_2O\rightarrow2NaOH+O_2}2Na+2H2O→2NaOH+O2
75 exam-style questions on Edexcel GCSE Chemistry 7.1 Group 1, covering 7.1.1 Classifying elements by group in the periodic table and 7.1.2 Properties and reactions of the alkali metals. Each one has a worked solution and a mark scheme showing where the marks go.