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CAIE A-Level Chemistry 8.1.1 Rate and Collision Theory Terms

Practise defining reaction rate and distinguishing collision frequency from effective and non-effective collisions.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • define rate as change in amount or concentration of a reactant or product per unit time
  • link higher concentration or gas pressure to more frequent collisions in a given volume
  • classify a collision as effective only when particles have sufficient energy and suitable orientation

8.1.1—Terms: rate of reaction, frequency of collisions question 1

[Maximum number: 1]

A large excess of 2-bromo-2-methylpropane is added to 0.0010 mol of NaOH(aq), which contains a few drops of phenolphthalein indicator. A stopwatch is started as soon as the substances are mixed. The time taken for the pink colour to disappear is recorded.

The experiment is repeated at different temperatures, keeping all concentrations and volumes of reagents constant.

Table for Question 8.1.1—Terms: rate of reaction, frequency of collisions question 1 — CAIE A-Level Chemistry AS

Explain what is meant by the term rate of reaction.

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