DP Chemistry (first assessment 2025)
Question 20N.1B.SL.TZ0.2g
| Date | November 2020 | Marks available | [Maximum mark: 1] | Reference code | 20N.1B.SL.TZ0.2g |
| Level | SL | Paper | 1B | Time zone | TZ0 |
| Command term | Suggest | Question number | g | Adapted from | N/A |
g.
[Maximum mark: 1]
20N.1B.SL.TZ0.2g
(g)
Suggest a risk of using sulfuric acid as the catalyst.
[1]
Markscheme
corrosive/burns/irritant/strong oxidizing agent/carcinogenic
OR
disposal is an environmental issue
OR
causes other side reactions/dehydration/decomposition ✔
Do not accept just “risk of accidents” OR “health risks” OR “hazardous”.
Examiners report
Most students received a mark for this question base on specific hazards. Very few students related disposal to environmental issues which isn't surprising as this is often missed in the Internal Assessment. Weaker students provided vague answers related to health issues which did not receive a mark. Some students misunderstood the question.
Syllabus sections
Reactivity 3. What are the mechanisms of chemical change? » Reactivity 3.1—Proton transfer reactions » Reactivity 3.1.6—Strong and weak acids and bases differ in the extent of ionization. Recognize that acid–base equilibria lie in the direction of the weaker conjugate. and are strong acids, and group 1 hydroxides are strong bases.