Another common component of reaction mechanism is a catalyst. These are compounds that change the reaction mechanism and provide a pathway with a lower activation energy, and correspondingly faster reaction rate. They are a reactant in an early step in the mechanism and a product in a later step. They do not appear in the overall reaction but do appear in the rate law. 3. A reaction occurs by the following mechanism; Step 1 Ce4+ + Mn²+ Ce³+ + Mn³+ Step 2 Ce4+ + Mn³+ Ce³+ + Mn¹+ Step 3 Ti* + Mn4+ → Ti³+ + Mn²+ a. Write the overall reaction. b. Identify each of the components as a reactant, product, intermediate, or catalyst; Mn²+ Mn³+ Ce4 Ce ³+ Mn Ti Ti³+ c. Assuming that the catalyst is involved in the rate determining step, what is the rate law for this reaction?

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Another common component of reaction mechanism is a catalyst. These are compounds that change
the reaction mechanism and provide a pathway with a lower activation energy, and correspondingly
faster reaction rate. They are a reactant in an early step in the mechanism and a product in a later step.
They do not appear in the overall reaction but do appear in the rate law.
3. A reaction occurs by the following mechanism;
Step 1
Ce4+ + Mn²+ →→ Ce³+ + Mn³+
Step 2
Ce4+ + Mn³+ → Ce³+ + Mn²+
Step 3
Tit+ Mn+→ Ti³+ + Mn²+
a. Write the overall reaction.
b. Identify each of the components as a reactant, product, intermediate, or catalyst;
Mn²+
Mn³+
Ce4+
Ce ³+
Mn4+
Tit
Ti³+
C. Assuming that the catalyst is involved in the rate determining step, what is the rate law for
this reaction?
4. Under certain conditions, the reaction:
2 NO + Cl₂ → 2 NOCI
is found to be second order in NO and first order Cl₂.
Given the following mechanism;
Step 1 NO + Cl2 → NOCI₂
Step 2 NOCI₂ + NO 2 NOCI
a. What are the relative rates of the two elementary steps under these conditions?
5. Consider the following reaction:
NO₂ + CO → NO + CO₂, where Rate =k[NO₂]²
a. Write the elementary steps for this reaction.
b. What is the reaction intermediate?
C. Draw an energy diagram for the above reaction. Label the following on the diagram:
i. Transition state(s)
ii. AHxn
iii. Activation energy (E₂)
iv. Why is the overall rate of the reaction k[NO₂]² and not k[NO₂][CO]?
6. Catalysis
a. What does a catalyst do?
Transcribed Image Text:Another common component of reaction mechanism is a catalyst. These are compounds that change the reaction mechanism and provide a pathway with a lower activation energy, and correspondingly faster reaction rate. They are a reactant in an early step in the mechanism and a product in a later step. They do not appear in the overall reaction but do appear in the rate law. 3. A reaction occurs by the following mechanism; Step 1 Ce4+ + Mn²+ →→ Ce³+ + Mn³+ Step 2 Ce4+ + Mn³+ → Ce³+ + Mn²+ Step 3 Tit+ Mn+→ Ti³+ + Mn²+ a. Write the overall reaction. b. Identify each of the components as a reactant, product, intermediate, or catalyst; Mn²+ Mn³+ Ce4+ Ce ³+ Mn4+ Tit Ti³+ C. Assuming that the catalyst is involved in the rate determining step, what is the rate law for this reaction? 4. Under certain conditions, the reaction: 2 NO + Cl₂ → 2 NOCI is found to be second order in NO and first order Cl₂. Given the following mechanism; Step 1 NO + Cl2 → NOCI₂ Step 2 NOCI₂ + NO 2 NOCI a. What are the relative rates of the two elementary steps under these conditions? 5. Consider the following reaction: NO₂ + CO → NO + CO₂, where Rate =k[NO₂]² a. Write the elementary steps for this reaction. b. What is the reaction intermediate? C. Draw an energy diagram for the above reaction. Label the following on the diagram: i. Transition state(s) ii. AHxn iii. Activation energy (E₂) iv. Why is the overall rate of the reaction k[NO₂]² and not k[NO₂][CO]? 6. Catalysis a. What does a catalyst do?
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