DP Chemistry (last assessment 2024)
Question 21N.2.hl.TZ0.c(iii)
| Date | November 2021 | Marks available | [Maximum mark: 2] | Reference code | 21N.2.hl.TZ0.c(iii) |
| Level | hl | Paper | 2 | Time zone | TZ0 |
| Command term | Determine | Question number | c(iii) | Adapted from | N/A |
c(iii).
[Maximum mark: 2]
21N.2.hl.TZ0.c(iii)
Hybridization of hydrocarbons affects their reactivity.
Experiments were carried out to investigate the mechanism of reaction between 2-chloropentane and aqueous sodium hydroxide.
Determine the initial rate of reaction in experiment 4.
[2]
Markscheme
ALTERNATIVE 1:
«k = » 1.25 «mol–1 dm3 s–1» ✔
«rate = 1.25 mol–1 dm3 s–1 × 0.60 mol dm–3 × 0.25 mol dm–3»
1.9 x 10–1 «mol dm–3 s–1» ✔
ALTERNATIVE 2:
«[NaOH] exp. 4 is 3 × exp. 1»
«[C5H11Cl] exp. 4 is 2.5 × exp. 1»
«exp. 4 will be » 7.5× faster ✔
1.9 x 10–1 «mol dm–3 s–1» ✔
Award [2] for correct final answer.
