(a)[2]
State any two physical properties of lithium.
(b(i))[1]
State, in terms of electrons, why potassium acts as a reducing agent in this reaction. The ionic equation for the reaction is: $2\text{K}(s) + 2\text{H}_2\text{O}(l) \rightarrow 2\text{K}^+(aq) + 2\text{OH}^-(aq) + \text{H}_2(g)$
(b(ii))[1]
State the oxidation number for hydrogen in $\text{H}_2$.
(b(iii))[3]
Describe the observations made during this reaction.
(c)[1]
A sample of sodium chloride is examined using a flame test. State the colour seen in the flame for this test.