(a)[2]
Give the names of the state changes marked A and B.
(b)[2]
Describe the arrangement and motion of the particles in sulfur vapour.
(c)[1]
Give one example of a use for sulfur.
(d)[2]
Explain why sulfur in coal has a harmful effect on human health when the coal is burnt.
(e(i))[1]
Determine the formula for thiophene.
(e(ii))[1]
What is the function of the catalyst?
(e(iii))[1]
Calculate the mass of thiophene produced when $15.6\,\text{g}$ of ethyne react with excess hydrogen sulfide.