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Edexcel A-Level Chemistry AS 9.2 Reactions Take Place Only When Collisions Have Sufficient Energy Known As the Activation Energy Questions

Read Eₐ from the reactant level to the profile peak, then reject collisions below that minimum even when particles meet; temperature changes the qualifying fraction.

Syllabus
First assessment 2019
Course
Chemistry YCH11
Level
AS

Exam points

  • Identify activation energy as the minimum collision energy shown on a reaction profile.
  • Explain unsuccessful collisions by insufficient energy rather than concentration or equilibrium.
  • Link high activation barriers to repulsion or bond breaking when the context provides it.

Edexcel A-Level Chemistry AS 9.2 Reactions Take Place Only When Collisions Have Sufficient Energy Known As the Activation Energy Questions question 1

[Maximum number: 1]

A Maxwell-Boltzmann distribution curve for the particles present in a reaction mixture is shown. Number of particles with energy, E

Figure for Question Edexcel A-Level Chemistry AS 9.2 Reactions Take Place Only When Collisions Have Sufficient Energy Known As the Activation Energy Questions question 1 — Edexcel A-Level Chemistry AS

Which statement is correct?

A

position X represents the mean energy of the particles

B

activation energy, EaE_{\mathrm{a}}, is the mean energy of the particles that react

C

the area under the curve to the right of the activation energy, EaE_{\mathrm{a}}, represents the number of particles with enough energy to react

D

adding a catalyst moves the activation energy, EaE_{\mathrm{a}}, to the right

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