Learning objective
Calculate rate constants and their units.
Read the explanation, check the common trap, then practise with flashcards and questions.
At a glance
0
Flashcards
0
Questions
Topic
Rate equations (A-level only)
Subtopic
Rate equations and orders (A-level only)
Study support
Understand this objective
Quick explanation
Calculate rate constants and their units
- This point belongs to Rate equations (A-level only), especially Rate equations and orders (A-level only).
- You need to be able to calculate rate constants and their units.
- The key ideas to know are rate constant.
- Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.
Key concepts
Why it matters
This objective helps connect Rate equations and orders (A-level only) to exam-style questions, flashcards, and revision notes for Rate equations (A-level only).
Quick student answer
What is the unit of the rate constant (k) for a second-order reaction?
Direct answer
dm³ mol⁻¹ s⁻¹
Key terms
- Rate of reaction: The change in concentration of a reactant or product per unit time.
- Rate law: An expression that relates the rate of a reaction to the concentration of reactants, typically in the form rate = k[A]^m[B]^n.
Common trap
Incorrect unit for rate constant: Always derive the units of k based on the overall order of the reaction to ensure accuracy.
Related questions
Try this as a practice card
Question 1 of 3
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Flashcard prompts
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Flashcard 1 of 3
Revision tools
Choose how to practise
Flashcards0 linked cards
Practice Questions0 linked questions
Revision notestopic notes
Open the full topic revision notes when you are ready to review this objective in context.
Open revision notesRelated learning objectives
- Deduce orders of reaction from initial rate data.
Rate equations and orders (A-level only)
- Write rate equations using experimentally determined orders.
Rate equations and orders (A-level only)
- Use half-life evidence for first-order reactions.
Rate equations and orders (A-level only)
- Interpret concentration-time graphs.
Rate equations and orders (A-level only)
- Explain the rate-determining step in a mechanism.
Mechanisms and rate-determining steps (A-level only)