DP Chemistry (last assessment 2024)
Question 18M.3.sl.TZ2.10c.i
| Date | May 2018 | Marks available | [Maximum mark: 1] | Reference code | 18M.3.sl.TZ2.10c.i |
| Level | sl | Paper | 3 | Time zone | TZ2 |
| Command term | Outline | Question number | c.i | Adapted from | N/A |
c.i.
[Maximum mark: 1]
18M.3.sl.TZ2.10c.i
Crude oil is a useful energy resource.
(c.i)
Outline how higher octane fuels help eliminate “knocking” in engines.
[1]
Markscheme
fuels can be compressed more without undergoing «unwanted» auto-ignition
Accept “burns smoother without undergoing «unwanted» auto-ignition” OR “fuel does not auto-ignite”.
[1 mark]
