(a)[1]
State one use for methane.
(b)[1]
Describe one way methane enters the atmosphere.
(c)[1]
State one environmental effect that methane in the atmosphere may cause.
(d(i))[2]
Calculate the compound’s empirical formula.
(d(ii))[1]
The compound has relative molecular mass 99. Deduce its molecular formula.
(e(i))[1]
What does the term diffusion mean?
(e(ii))[1]
Explain why propane diffuses more quickly at $100^\circ\text{C}$ than at $60^\circ\text{C}$.
(e(iii))[2]
Explain why diffusion could be used to separate a methane and propane mixture.