Chemistry 30

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Chemical Kinetics

Practice Questions: Factors Influencing Reaction Rate - Catalysts
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1.

Phosgene, COCl2, one of the poison gases used during World War I, is formed from chlorine and carbon monoxide. The mechanism is thought to proceed by:

step 1: Cl + CO → COCl
step 2: COCl + Cl2 → COCl2 + Cl

a. Write the overall reaction equation.

b. Identify any reaction intermediates.

c. Identify any catalysts.

2.

We have typically been simplifying our potential energy curves somewhat; for multistep reactions, potential energy curves are more accurately shown with multiple peaks. Each peak represents the activated complex for an individual step.

Consider the PE curve for a two-step reaction:

 

 

potential energy curve for a multistep reaction
a. What is ΔH for the overall reaction?
b. What is ΔH for the first step of the reaction mechanism?
c. What is ΔH for the second step of the reaction mechanism?
d. What is ΔH for the overall reverse reaction?
e. What is Ea for the first step?
f. What is Ea for the second step?
g. Which is the rate-determing step - step 1 or step 2? How do you know?
h. What is Ea for the reverse of step 1?
i. Is the overall reaction endothermic or exothermic?

Check your answers

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Credits | Central iSchool | Sask Learning | Saskatchewan Evergreen Curriculum | Updated: 26-Jun-2006