(a(i))[2]
Fill in the table by estimating the density of iodine at room temperature and pressure and the boiling point of astatine.
(a(ii))[2]
State the physical state of bromine at 20 ^{\circ}C. Give a reason for your answer.
(b(i))[2]
Complete the chemical equation for this reaction. Br$_2$ + SO$_2$ + … H$_2$O → H$_2$SO$_4$ + … HBr.
(b(ii))[1]
In this reaction both oxidation and reduction occur. State the meaning of the term reduction.
(c)[3]
Use the kinetic particle model to explain these observations.