Question 22M.1.sl.TZ2.15
| Date | May 2022 | Marks available | [Maximum mark: 1] | Reference code | 22M.1.sl.TZ2.15 |
| Level | sl | Paper | 1 | Time zone | TZ2 |
| Command term | Deduce | Question number | 15 | Adapted from | N/A |
Which statement is correct about identical pieces of magnesium added to two solutions, X and Y, containing hydrochloric acid at the same temperature?
A. Solution X will reach a higher maximum temperature.
B. Solution Y will reach a higher maximum temperature.
C. Solutions X and Y will have the same temperature rise.
D. It is not possible to predict whether X or Y will have the higher maximum temperature because we cannot identify the limiting reactant.
[1]
A
A nice question that required thinking. There were two factors to consider: amount of reactants and temperature rise. Most candidates focused on the same amount of Mg and HCl hence concluded that the temperature rise would be the same. In fact, it is the same amount of heat that is released, however with a larger volume of solution in Y, the temperature rise is higher for X. 40% of the candidates answered correctly.