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ZIMSEC A-Level Chemistry

6.1.8.2Rate equations

Rate equations in ZIMSEC A-Level Chemistry: what the syllabus expects you to know, the learning objectives and how to practise.
Subtopic25 practice questions1 lesson

Learning objectives

What the syllabus expects you to be able to do.

  1. 6.1.8.2.1Explain rate equation, order of reaction, rate constant and half-life.
  2. 6.1.8.2.2Construct rate equations of the form rate = k[A]^m[B]^n with m and n equal to 0, 1 or 2.
  3. 6.1.8.2.3Calculate initial rate, half-life and rate constant.
  4. 6.1.8.2.4Deduce the order of reaction by the initial-rate method and from concentration-time graphs.
  5. 6.1.8.2.5Show graphically that the half-life of a first-order reaction is constant.

Lessons

  • Rate equations, orders and half-life

    55 min

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Sample question

A sample question on this topic. Answer it, check it, then read the worked answer.

Rate equations: sample question

1 mark

A reaction is zero order with respect to reactant X. What happens to the rate when the concentration of X is doubled?

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