DP Chemistry (last assessment 2024)
Question 18M.2.hl.TZ1.4b.iii
| Date | May 2018 | Marks available | [Maximum mark: 1] | Reference code | 18M.2.hl.TZ1.4b.iii |
| Level | hl | Paper | 2 | Time zone | TZ1 |
| Command term | Show, Suggest | Question number | b.iii | Adapted from | N/A |
b.iii.
[Maximum mark: 1]
18M.2.hl.TZ1.4b.iii
Calcium carbonate reacts with hydrochloric acid.
CaCO3(s) + 2HCl(aq) → CaCl2(aq) + H2O(l) + CO2(g)
The results of a series of experiments in which the concentration of HCl was varied are shown below.
(b.iii)
Suggest the relationship that points A, B and C show between the concentration of the acid and the rate of reaction.
[1]
Markscheme
«directly» proportional
Accept “first order” or “linear”.
Do not accept “rate increases as concentration increases” or “positive correlation”.
[1 mark]
