3 The Rate-Determining Step

chemistry
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3 The Rate-Determining Step

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  1. The Rate-Determining Step

    Slide 1 - The Rate-Determining Step

    • Specification Reference 3.4.1
  2. Learning Objective

    Slide 2 - Learning Objective

    • Understand that the orders of reactions with respect to reactants can be used to provide information about the rate determining step of a reaction.
  3. What is the rate determining step?

    Slide 3 - What is the rate determining step?

    • A chemical reaction (reaction mechanism) can have more than one step.
    • Each step has its own rate; the step with the slowest rate is the rate determining step.
    • All the species (including catalysts and intermediaries) that are in the rate equation are in the rate determining step; but not all the species in the chemical equation need to be in the rate equation.
    • The order of a reaction with respect to a reactant shows the number of molecules of that reactant involved in the rate determining step.
  4. What is the rate determining step?

    Slide 4 - What is the rate determining step?

  5. Reaction mechanisms

    Slide 5 - Reaction mechanisms

    • 2-bromo-2-methylpropane can react with the nucleophile OH- to give 2-methyl propan-2-ol and bromide ions (Br-). What is the reaction mechanism?
  6. Reaction mechanisms

    Slide 6 - Reaction mechanisms

    • Nitrogen monoxide can react with oxygen to produce nitrogen dioxide.
  7. Learning Objective

    Slide 7 - Learning Objective

    • Understand that the orders of reactions with respect to reactants can be used to provide information about the rate determining step of a reaction.