16.2 Activation Energy

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Question 1

Marks: 1

q1_16-2_medium-activation-energy_mcq_hl_medium

Which of the following statements about the Arrhenius plot are correct?

The gradient has a value of E_a / R
The intercept on the y-axis is ln A
The Arrhenius plot will give a value for activation energy in J mol^-1

I and II only
I and III only
II and III only
I, II and III

Key Concepts

The Arrhenius Equation
Graphing the Arrhenius Equation

Question 2

Marks: 1

The following information was obtained for the rate constant, k, for a reaction at 25 ^OC

A	E_a	R
2.57 × 10⁹ s^–1	96.2 kJ mol^–1	8.31 J K^–1 mol^–1

Which expression correctly represents how to calculate the rate constant, k?

k = (2.57 x 10⁹) x e^{(-96.2 / 8.31×25)}
k = (2.57 x 10⁹) x e^{(-96.2 / 8.31×298)}
k = (2.57 x 10⁹) x e^{(-96200 / 8.31×25)}
k = (2.57 x 10⁹) x e^{(-96200 / 8.31×298)}

Key Concepts

The Arrhenius Equation

Question 3

Marks: 1

The following experimental data was collected.

Activation energy, E_a	111 kJ mol^–1
Rate constant, k	1.30 x 10^-4 mol^-1 dm³ s^-1
Arrhenius constant, A	4.55 × 10¹³ mol^-1 dm³ s^-1

Which expression correctly calculates the temperature of the reaction?

T = $\frac{111}{8.31 \times (l n 4.55 \times 10^{13} - l n 1.30 \times 10^{- 4})}$
T = $\frac{111 \times 10^{3}}{8.31 \times (l n 4.55 \times 10^{13} - l n 1.30 \times 10^{- 4})}$
T = $\frac{111 \times 10^{3}}{8.31 \times (l n 1.30 \times 10^{- 4} - l n 4.55 \times 10^{13})}$
T = $\frac{111 \times 10^{3}}{(8.31 \times 10^{- 3}) \times (l n 4.55 \times 10^{13} - l n 1.30 \times 10^{- 4})}$

Key Concepts

The Arrhenius Equation

Question 4

Marks: 1

Consider the following statements:

Many reactions show a doubling of the rate with a temperature increase of 10K
The units of k for a second order reaction are mol^-1 dm³ s^-1
In the Arrhenius equation, A relates to the energy requirements of the collisions

Which statements are correct?

I and II only
I and III only
II and III only
I, II and III

Key Concepts

The Arrhenius Equation

Question 5

Marks: 1

Which graph shows the correct relationship between the rate constant, k, and temperature?

CGpBBWaM_1

Key Concepts

The Arrhenius Equation
Rate Constants

DP IB Chemistry: HL

Topic Questions

16.2 Activation Energy

Question 1

Key Concepts

Question 2

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Question 3

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Question 4

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Question 5

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