DP Chemistry (first assessment 2025)
Question 22N.1A.HL.TZ0.21
| Date | November 2022 | Marks available | [Maximum mark: 1] | Reference code | 22N.1A.HL.TZ0.21 |
| Level | HL | Paper | 1A | Time zone | TZ0 |
| Command term | State | Question number | 21 | Adapted from | N/A |
21.
[Maximum mark: 1]
22N.1A.HL.TZ0.21
The activation energy of a reaction can be obtained from the rate constant, k, and the absolute temperature, . Which graph of these quantities produces a straight line?
A. k against
B. k against
C. ln k against
D. ln k against
[1]
Markscheme
D
Examiners report
Over 80% of candidates correctly identified the variables that should be plotted to determine activation energy from rate data, with the other distractors being about equally favoured.
Syllabus sections
Reactivity 2. How much, how fast and how far? » Reactivity 2.2—How fast? The rate of chemical change » Reactivity 2.2.12—The Arrhenius equation uses the temperature dependence of the rate constant to determine the activation energy. Describe the qualitative relationship between temperature and the rate constant. Analyse graphical representations of the Arrhenius equation, including its linear form.