(a)[1]
State the name assigned to Group VII elements.
(b)[1]
State which Group VII element is the most reactive.
(c)[2]
Give iodine’s physical state and colour at room temperature and pressure. state colour
(d(i))[2]
Write the ionic equation for this reaction.
(d(ii))[3]
Calculate the enthalpy change, $\Delta H$, for the reaction by using the bond energies in Table 6.1. Find the total energy needed to break the bonds in 1 mol of I$_2$(g) and 1 mol of Br$_2$(g). Find the total energy given out when the bonds in 2 mol of IBr(g) are formed. Calculate the enthalpy change, $\Delta H$, for the reaction. Your answer must show a sign.
(e(i))[2]
Give two observations made when sodium is added to water.
(e(ii))[1]
State the final colour shown by the thymolphthalein in the solution.