Question 22N.2.hl.TZ0.5e
| Date | November 2022 | Marks available | [Maximum mark: 2] | Reference code | 22N.2.hl.TZ0.5e |
| Level | hl | Paper | 2 | Time zone | TZ0 |
| Command term | Discuss | Question number | e | Adapted from | N/A |
Lignite, a type of coal, contains about 0.40 % sulfur by mass.
Discuss two different ways to reduce the environmental impact of energy production from coal.
[2]
Any two of:
remove sulfur from coal ✔
add lime during combustion ✔
not allow sulfur oxides to be released into the environment ✔
reduce proportion/percentage of energy/power produced by «the combustion of» coal ✔
Accept any valid method to wash coal and remove sulfur content for M1.
Accept any valid combustion/post-combustion method to remove sulfur oxides.
Accept any suggestion that would reduce the amount of coal that is burnt or would reduce the damage caused.
Do not accept answers that only reduce production of SO2/CO2 from other fuels.
Accept “improve efficiency of energy production from coal”.
Accept “use coal of lower sulfur content” OR “cleaner coal”.
The average for this very open ended question was just over half marks. Many correct answers were possible, however some that occurred quite frequently (catalytic converters) are not relevant to the process and others (using public transport) only affect pollution from other sources, not the burning of coal.
