a.) Would you expect this reaction to take place in a single step? Why or why not? b.) This reaction is thought to take place by means of the following mechanism: Step 1: HBr + O2 HOOBI (slow) Step 2: HBr + HOOBr 2 HOBr (fast) Step 3: 2 HBr + 2 HOBT 2 H20 + 2 Br2 (fast) i. Identify the two intermediates. ii. Which step has the greatest activation energy? ii. How many "peaks" will the potential energy diagram for the reaction mechanism have? iv. Which step is called the rate determining step in this mechanism?

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Chapter1: Chemical Foundations
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Given the reaction: 4 HBr+ 02 2 H20+2 Br
a.) Would you expect this reaction to take place in a single step? Why or why not?
b.) This reaction is thought to take place by means of the following mechanism:
Step 1: HBr + O2 HOOBR (slow)
Step 2: HBr + HQOBr 2 HOBI (fast)
Step 3: 2 HBr +2 HOBr 2 H2O + 2 Br2 (fast)
i. Identify the two intermediates.
ii. Which step has the greatest activation energy?
ii. How many "peaks" will the potential energy diagram for the reaction
mechanism have?
iv. Which step is called the rate determining step in this mechanism?
v. In order to have successful collisions, the colliding particles must have
both the proper amount of energy and the proper
(fill in blank)?
vi. On the set of axes below, draw the shape of the curve you might
expect for the reaction in this question. The overall reaction is
exothermic.
Enthalpy
Progress of Reaction
c.) A catalyst is discovered which increases the rate of Step 3. How will this affect the
rate of the overall reaction? Explain your answer.
d.) A catalyst is discovered which increases the rate of Step 1. How will this affect the
rate of the overall reaction? Explain your answer.
Transcribed Image Text:Given the reaction: 4 HBr+ 02 2 H20+2 Br a.) Would you expect this reaction to take place in a single step? Why or why not? b.) This reaction is thought to take place by means of the following mechanism: Step 1: HBr + O2 HOOBR (slow) Step 2: HBr + HQOBr 2 HOBI (fast) Step 3: 2 HBr +2 HOBr 2 H2O + 2 Br2 (fast) i. Identify the two intermediates. ii. Which step has the greatest activation energy? ii. How many "peaks" will the potential energy diagram for the reaction mechanism have? iv. Which step is called the rate determining step in this mechanism? v. In order to have successful collisions, the colliding particles must have both the proper amount of energy and the proper (fill in blank)? vi. On the set of axes below, draw the shape of the curve you might expect for the reaction in this question. The overall reaction is exothermic. Enthalpy Progress of Reaction c.) A catalyst is discovered which increases the rate of Step 3. How will this affect the rate of the overall reaction? Explain your answer. d.) A catalyst is discovered which increases the rate of Step 1. How will this affect the rate of the overall reaction? Explain your answer.
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