DP Chemistry (first assessment 2025)
Question 19M.1A.SL.TZ1.17
| Date | May 2019 | Marks available | [Maximum mark: 1] | Reference code | 19M.1A.SL.TZ1.17 |
| Level | SL | Paper | 1A | Time zone | TZ1 |
| Command term | Question number | 17 | Adapted from | N/A |
17.
[Maximum mark: 1]
19M.1A.SL.TZ1.17
Which will increase the rate of reaction between calcium carbonate and hydrochloric acid?
I. an increase in temperature
II. an increase in concentration of hydrochloric acid
III. an increase in particle size of calcium carbonate
A. I and II only
B. I and III only
C. II and III only
D. I, II and III
[1]
Markscheme
A
Examiners report
One teacher pointed out that the question should have stated for a fixed mass of calcium carbonate. However, this question was one of the highest scoring so it did not cause confusion.
Syllabus sections
Reactivity 2. How much, how fast and how far? » Reactivity 2.2—How fast? The rate of chemical change » Reactivity 2.2.3—Factors that influence the rate of a reaction include pressure, concentration, surface area, temperature and the presence of a catalyst. Predict and explain the effects of changing conditions on the rate of a reaction.