Practice Rate-Determining Step and the Steady-State Approximation - 4.6 | Unit 6: Chemical Kinetics | IB Grade 11: Chemistry
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4.6 - Rate-Determining Step and the Steady-State Approximation

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Learning

Practice Questions

Test your understanding with targeted questions related to the topic.

Question 1

Easy

What is the rate-determining step (RDS)?

💡 Hint: Think about which step limits the reaction speed.

Question 2

Easy

Explain how the steady-state approximation is used in kinetic studies.

💡 Hint: Consider why it's useful to assume intermediates don't change significantly during the reaction.

Practice 1 more question and get performance evaluation

Interactive Quizzes

Engage in quick quizzes to reinforce what you've learned and check your comprehension.

Question 1

What defines the rate-determining step in a multi-step reaction?

  • The fastest step
  • The slowest step
  • The step with the most intermediates

💡 Hint: Think about which step limits the speed of the entire reaction.

Question 2

True or False: The steady-state approximation allows for changing concentrations of intermediates.

  • True
  • False

💡 Hint: What does 'constant' mean in this context?

Solve and get performance evaluation

Challenge Problems

Push your limits with challenges.

Question 1

Consider a reaction mechanism with three steps: A + B ⇌ C (fast), C → D (slow, RDS), and D → E (fast). Using the steady-state approximation, derive the rate law for the formation of E.

💡 Hint: What equilibrium constant can help connect A and B to C?

Question 2

Explain how the introduction of a catalyst could change the rate-determining step in a reaction mechanism.

💡 Hint: Consider how catalysts affect energy barriers.

Challenge and get performance evaluation