–(f) When sodium reacts with water, hydrogen is given off.

•2Na(s) + 2H2O(l)  à 2NaOH(aq) + H2(g)

•(i) State the name of the other product formed in this reaction. [1]

•(ii) Describe a test for hydrogen.

• test

•

•

• result [2]

•

•

–(g) Explain the different reactivity of sodium and potassium with water. [2]