DP Chemistry (last assessment 2024)
Question 18M.3.sl.TZ1.11b
| Date | May 2018 | Marks available | [Maximum mark: 1] | Reference code | 18M.3.sl.TZ1.11b |
| Level | sl | Paper | 3 | Time zone | TZ1 |
| Command term | Outline | Question number | b | Adapted from | N/A |
b.
[Maximum mark: 1]
18M.3.sl.TZ1.11b
One suggestion for the reduction of carbon footprints is the use of biofuels, such as vegetable oils, as a substitute for petroleum based fuels.
(b)
Outline why biofuels are considered more environmentally friendly, even though they produce more carbon dioxide per kJ of energy than petroleum based fuels.
[1]
Markscheme
«growing oil producing» plants absorbs carbon dioxide from the atmosphere
OR
«combustion of» petroleum based fuels releases carbon stored «for millions of years»
Accept “biofuels renewable” OR “petroleum based fuels non-renewable”.
Accept “waste vegetable oils can be converted to biofuels/biodiesel”.
Accept “biofuels do not contain sulfur”.
[1 mark]
