Calcium and bromine react to produce calcium bromide. Describe what happens to calcium atoms and bromine atoms when the ionic compound calcium bromide is formed.

Solid calcium bromide cannot be electrolysed. Give one reason why.

Name the product formed at the negative electrode (cathode) when aqueous calcium bromide solution is electrolysed.

Select the correct half equation for the reaction at the positive electrode (anode) when aqueous calcium bromide solution is electrolysed:

• A: $2{Br}^{-}\to {Br}_2+2e^{-}$
• B: ${Br}_2+2e^{-}\to 2{Br}^{-}$
• C: $4{OH}^{-}\to O_2+2H_{2}O+4e^{-}$
• D: $O_2+2H_{2}O+4e^{-}\to 4{OH}^{-}$