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Date	November 2019	Marks available	1	Reference code	19N.1.hl.TZ0.22
Level	HL	Paper	1	Time zone	TZ0
Command term	State	Question number	22	Adapted from	N/A

Question

What is the intercept on the y-axis when a graph of lnk is plotted against $\frac{1}{T}$ on the x-axis?

$\ln k = - \frac{E_{a}}{R T} + \ln A$

A. lnA

B. $- \frac{E_{a}}{R}$

C. $- \frac{R}{E_{a}}$

D. $E_{a}$

Markscheme

A

Examiners report

[N/A]

Syllabus sections

Additional higher level (AHL) » Topic 16: Chemical kinetics » 16.2 Activation energy

18M.1.hl.TZ1.21: What is the effect of increasing temperature on the rate constant, k? A. The rate...
18M.2.hl.TZ1.4d:
Describe how the activation energy of this reaction could be determined.
17M.1.hl.TZ2.20:
Which is true of an Arrhenius plot of $\ln k$ (y-axis) against $\frac{1}{T}$ ?

A. The graph goes through the origin.

B. The activation energy can be determined from the gradient.

C. The intercept on the x-axis is the activation energy.

D. The intercept on the y-axis is the frequency factor, A.
17M.2.hl.TZ2.5c:
The Arrhenius equation, $k = A{e^{ - \frac{{Ea}}{{RT}}}}$ , gives the relationship between the rate constant and temperature.

State how temperature affects activation energy.
17N.1.hl.TZ0.22: Which pair of statements explains the increase in rate of reaction when the temperature...
18M.2.hl.TZ2.6d:
The rate constant for a reaction doubles when the temperature is increased from 25.0 °C to 35 °C.

Calculate the activation energy, E_a, in kJ mol⁻¹ for the reaction using section 1 and 2 of the data booklet.

Additional higher level (AHL) » Topic 16: Chemical kinetics

Additional higher level (AHL)