(a(i))[2]
Complete the table by estimating bromine’s boiling point and the density of liquid chlorine at its boiling point.
(a(ii))[1]
Use the information in the table to infer the colour of astatine.
(b)[1]
Explain why chlorine is added to water during treatment.
(c(i))[1]
Construct the ionic equation for the reaction.
(c(ii))[1]
Explain why iodine does not react with potassium chloride.
(d)[2]
Hydrated nickel(II) chloride has the formula $\text{NiCl}_2\cdot x\text{H}_2\text{O}$. Its relative formula mass is 238. Calculate the value of $x$ in this formula. [The relative atomic mass of nickel, Ni, is 59]