The table shows the boiling points of four different hydrocarbon molecules present in a natural gas condensate mixture.
\begin{array}{|c|c|} \hline \text{Hydrocarbon} & \text{Boiling Point } (^\circ\text{C}) \\\ \hline \text{P} & -89 \\\ \hline \text{Q} & -0.5 \\\ \hline \text{R} & 36 \\\ \hline \text{S} & 98 \\\ \hline \end{array}Which hydrocarbon, P\text{P}P, Q\text{Q}Q, R\text{R}R, or S\text{S}S, is most likely to be collected in the gaseous fraction at the very top of a fractional distillation column? Explain your choice.
A logistics company is deciding between using Biodiesel delivery trucks or Electric battery-powered (EV) delivery trucks. The table below shows information about a 500 km500\text{ km}500 km freight route for both types of truck:
\begin{array}{|c|c|c|} \hline \text{Feature} & \text{Biodiesel Truck} & \text{Electric EV Truck} \\\ \hline \text{Recharging / Refuelling time (minutes)} & 15 & 90 \\\ \hline \text{Cost of fuel per } 500\text{ km (£)} & 185.00 & 115.00 \\\ \hline \text{Net life-cycle CO}_2\text{e emitted (kg)} & 145 & 35 \\\ \hline \text{Mass of truck (kg)} & 14\,000 & 19\,500 \\\ \hline \end{array}Evaluate the advantages and disadvantages of choosing the Electric EV truck instead of the Biodiesel truck for this route. Use the data in the table to support your response.
83 exam-style questions on OCR GCSE Chemistry Organic chemistry. Each one has a worked solution and a mark scheme showing where the marks go.