DP Chemistry (first assessment 2025)
Question 22M.1A.SL.TZ2.22
| Date | May 2022 | Marks available | [Maximum mark: 1] | Reference code | 22M.1A.SL.TZ2.22 |
| Level | SL | Paper | 1A | Time zone | TZ2 |
| Command term | Deduce | Question number | 22 | Adapted from | N/A |
22.
[Maximum mark: 1]
22M.1A.SL.TZ2.22
Which combination best describes what is happening to chloromethane, CH3Cl, in the equation below?
CH3Cl (g) + H2 (g) CH4 (g) + HCl (g)
A. Oxidation and addition
B. Oxidation and substitution
C. Reduction and addition
D. Reduction and substitution
[1]
Markscheme
D
Examiners report
57% of the candidates were able to identify the type of reaction (oxidation or reduction & addition or substitution) correctly.
Syllabus sections
Reactivity 3. What are the mechanisms of chemical change? » Reactivity 3.2—Electron transfer reactions » Reactivity 3.2.1—Oxidation and reduction can be described in terms of electron transfer, change in oxidation state, oxygen gain/loss or hydrogen loss/gain. Deduce oxidation states of an atom in a compound or an ion. Identify the oxidized and reduced species and the oxidizing and reducing agents in a chemical reaction.