DP Chemistry (first assessment 2025)
Question 19M.1A.SL.TZ1.39
| Date | May 2019 | Marks available | [Maximum mark: 1] | Reference code | 19M.1A.SL.TZ1.39 |
| Level | SL | Paper | 1A | Time zone | TZ1 |
| Command term | Question number | 39 | Adapted from | N/A |
39.
[Maximum mark: 1]
19M.1A.SL.TZ1.39
The dotted line represents the formation of oxygen, O2 (g), from the uncatalysed complete decomposition of hydrogen peroxide, H2O2 (aq).
Which curve represents a catalysed reaction under the same conditions?
[1]
Markscheme
B
Examiners report
Graphical representation of catalysis was also well answered.
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.