(a(i))[1]
State the name of the compound MgSO$_4$.
(a(ii))[1]
Calculate the combined mass of compounds in 800 cm$^3$ of sea water.
(a(iii))[1]
Potassium chloride dissolves in water. Select one further compound that is soluble in water.
(b)[2]
Describe a test for iodide ions, including both the test and the observations.
(c)[2]
Complete Fig. 2.1 so that it shows the electronic configuration of a potassium ion and the charge on the ion.
(d)[2]
Describe how the particles are spaced and how they move in a solid.
(e)[1]
State one source of phosphate ions.
(f)[2]
Complete Fig. 2.2 with a dot-and-cross diagram for one water molecule. Show outer electrons only.