AP Chemistry · Topic 5.10

Multistep Reaction Energy Profile Practice

Part of Kinetics.(TRA-5.D)

Practice questions

2

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Sample questions

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Sample 1difficulty 3/5
$A two-step mechanism shows two transition states. TS2 is higher in energy than TS1.$
$Which step is the rate-determining step?$
- A
  $Both equal$
- B
  $The fastest step$
- C
  $Step 2 (TS2 has highest Ea)$
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- D
  $Step 1 (always the first step)$
Why
$The rate-determining step has the highest activation energy. TS2 is highest, so step 2 is rate-determining.$
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Sample 2difficulty 3/5
$The first step's activation energy is measured from:$
- A
  $Intermediate to TS2$
- B
  $Products to TS2$
- C
  $Intermediate up to TS1$
- D
  $Reactants up to TS1$
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Why
$Each step's Ea is measured from its starting state (reactants for step 1, intermediate for step 2) up to its TS.$
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