(a(i))[2]
Draw the structures of three possible compounds with the formula $\text{C}_3\text{H}_y$.
(a(ii))[1]
Which source of shale gas, J, K, L or M, will release the most energy when burned? Explain your answer.
(a(iii))[2]
Suggest two methods by which carbon dioxide can be taken out of shale gas.
(b(i))[1]
Suggest why shale gas gives off the smallest amount of $\text{CO}_2$.
(b(ii))[1]
Explain which of the three fuels, shale gas, fuel oil or coal, is the biggest contributor to ‘acid rain’.
(b(iii))[1]
Suggest a reason why fuel oil and coal give off more $\text{NO}_2$ than shale gas.
(b(iv))[2]
State one environmental effect of increased levels of: - $\text{CO}$ - $\text{CO}_2$