An alkane, C16H34\mathrm{C_{16}H_{34}}C16H34, is cracked. The only products are one molecule of octane, C8H18\mathrm{C_{8}H_{18}}C8H18, and some molecules of ethene, C2H4\mathrm{C_{2}H_{4}}C2H4.
How many molecules of ethene are made from one molecule of C16H34\mathrm{C_{16}H_{34}}C16H34?
2
4
8
16
63 exam-style questions on OCR GCSE Chemistry 6.2 Organic chemistry, covering 6.2.1 Crude oil and fractional distillation, 6.2.2 Cracking and dependence on hydrocarbons, 6.2.3 Functional groups and homologous series, 6.2.4 Reactions of alkanes, alkenes and alcohols, 6.2.5 Addition polymerisation and repeat units, 6.2.6 Naturally occurring polymers, 6.2.7 Chemical cells and fuel cells, and 6.2.8 Condensation polymerisation and how to make one. Each one has a worked solution and a mark scheme showing where the marks go.