Energy Diagrams
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Energy Diagrams
5 problems
1PRACTICE PROBLEM
Consider the reaction X → Z and its reaction profile below.
(a) Identify the number of transition states and intermediates formed.
(b) Is X → Y faster than Y → Z?
(c) What is the sign of ΔE?
2PRACTICE PROBLEM
Which step is the slowest based on the graph below?
3PRACTICE PROBLEM
The energy diagram for the reaction of NO2 with CO is
The overall reaction is
NO2 + CO → NO + CO2
with the following proposed mechanism
step 1: NO2 + NO2 → NO + NO3
step 2: NO3 + CO → NO2+ CO2
Determine the rate-limiting step
4PRACTICE PROBLEM
Determine whether the reaction is endothermic or exothermic based on its energy diagram.
5PRACTICE PROBLEM
Label the following energy diagram for a reaction over time.
enthalpy of reaction (ΔHrxn), activation energy (Ea), products, reactants