A computer model shows the products formed when one molecule of a long-chain alkane is cracked.
| Product | Number of molecules formed |
|---|---|
| Butane, C4H10\mathrm{C_{4}H_{10}}C4H10 | 1 |
| Propene, C3H6\mathrm{C_{3}H_{6}}C3H6 | 3 |
How many carbon atoms were in the alkane molecule before it was cracked?
12
13
9
7
131 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.