WJEC A Level Chemistry
WJEC A Level Chemistry 3.5 Chemical Kinetics Exam Questions
Free WJEC A Level Chemistry exam questions on 3.5 Chemical Kinetics, with mark schemes. Covers rate equations, orders of reaction, rate constants, half-life and mechanisms.
3.5 Chemical Kinetics exam questions
1 question pack of real past exam questions with its mark scheme. Answer every question without notes, then mark your answers line by line against the mark scheme.
StemUp mark scheme flashcards
WJEC A Level Chemistry Flashcards (Anki & Quizlet)
Every answer is written in mark scheme wording, so you learn exactly what examiners give marks for. Use them on Anki or Quizlet, then test yourself with the questions on this page.
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About WJEC A Level Chemistry 3.5 Chemical Kinetics
This topic covers quantitative kinetics. Expect initial rate data and rate-determining step questions.
What you need to know
- Rate equations Rate = k[A]^m[B]^n, with orders found experimentally.
- Orders Zero, first and second order graphs and their shapes.
- Half-life Constant half-life indicates first order.
- Mechanisms The rate-determining step contains species in the rate equation.
Common mistakes in 3.5 Chemical Kinetics
- Using stoichiometric coefficients as orders.
- Getting units of k wrong.
- Confusing rate-concentration and concentration-time graphs.
Try three 3.5 Chemical Kinetics exam-style questions
1. Doubling [A] quadruples the rate. State the order with respect to A. (1 mark)
Show the mark scheme answer
Second order.
2. Give the units of k for a second order reaction overall. (1 mark)
Show the mark scheme answer
mol⁻¹ dm³ s⁻¹.
3. Explain what the rate-determining step is. (1 mark)
Show the mark scheme answer
The slowest step in a mechanism, which controls the overall rate.
3.5 Chemical Kinetics FAQs
What does Chemical Kinetics cover?
Rate equations, orders, rate constants, half-life and mechanisms.
Which practical links here?
Clock reactions or continuous monitoring to determine orders.
How do I find k?
Substitute initial rate and concentrations into the rate equation.
Revise this topic with flashcards: WJEC A Level Chemistry Flashcards, with mark scheme answers for Anki and Quizlet.
