DP Chemistry (last assessment 2024)
Question 18M.3.sl.TZ1.10c.ii
| Date | May 2018 | Marks available | [Maximum mark: 1] | Reference code | 18M.3.sl.TZ1.10c.ii |
| Level | sl | Paper | 3 | Time zone | TZ1 |
| Command term | Outline | Question number | c.ii | Adapted from | N/A |
c.ii.
[Maximum mark: 1]
18M.3.sl.TZ1.10c.ii
The increased concentration of carbon dioxide in the atmosphere is thought to result from the increased combustion of fossil fuels such as petroleum.
(c.ii)
Outline why the energy available from an engine will be less than these theoretical values.
[1]
Markscheme
energy is lost «to the surroundings» as heat/sound/friction
OR
energy is lost to the surroundings «as heat/sound/friction»
OR
incomplete combustion
Do not accept just “energy is lost”.
[1 mark]
