Write equations for the reactions of:
$(i)$ Iron with steam
$(ii)$ Calcium and potassium with water

(N/A) $(i)$ $3Fe_{(s)} + 4H_2O_{(g)} \rightarrow Fe_3O_{4(s)} + 4H_{2(g)}$
$(ii)$ Calcium with water: $Ca_{(s)} + 2H_2O_{(l)} \rightarrow Ca(OH)_{2(aq)} + H_{2(g)} + \text{Heat}$
$(iii)$ Potassium with water: $2K_{(s)} + 2H_2O_{(l)} \rightarrow 2KOH_{(aq)} + H_{2(g)} + \text{Heat}$