| Date | November 2012 | Marks available | 3 | Reference code | 12N.3.sl.TZ0.C2 |
| Level | SL | Paper | 3 | Time zone | TZ0 |
| Command term | State | Question number | C2 | Adapted from | N/A |
Question
the oil industry surplus long-chain hydrocarbons are converted into shorter, more useful hydrocarbons by various kinds of cracking.
State whether each of the following are examples of homogeneous or heterogeneous catalysis.
Steam cracking:
Catalytic cracking:
Hydrocracking:
Markscheme
Steam cracking:
homogeneous;
Catalytic cracking:
heterogeneous;
Hydrocracking:
heterogeneous;
Examiners report
There were few three-mark answers; perhaps many candidates guessed.
