(a)[1]
Suggest why the sodium is heated in argon rather than in air.
(b)[1]
Which section of the graph shows the boiling point of sodium? Tick one box.
(c(i))[2]
Describe two ways in which the general properties of a liquid and a gas differ.
(c(ii))[2]
Describe the arrangement and motion of particles in a liquid.
(d(i))[2]
Describe two properties of niobium that are different from those of sodium.
(d(ii))[1]
Determine what formula niobium chloride has.
(d(iii))[2]
Predict any two physical properties of niobium chloride.