Worksheet: Elementary and Rate-Determining Steps
In this worksheet, we will practice using the orders of reaction in a rate law to identify the rate-determining step in a multi-step reaction.
Chlorine radicals from the decomposition of chlorofluoromethanes, such as , catalyze the decomposition of ozone () in the atmosphere. One decomposition pathway involves three elementary reactions:
Reaction 1: , rate constant .
Reaction 2: , rate constant .
Reaction 3: , rate constant .
Write a balanced chemical equation for the overall reaction.
Explain why chlorine radicals are catalysts in this reaction.
- AThe reaction of with chlorine radicals is faster than the decomposition reaction 1.
- BChlorine radicals react in the rate-determining step, reaction 2.
- CReaction 2 converts chlorine radicals to radicals, which are necessary to consume the radicals produced in Reaction 1.
- DChlorine radicals are consumed in reaction 2 but regenerated in reaction 3, so there is no net change in .
- EReaction 2 converts chlorine radicals to radicals, which are less stable than the radicals produced in Reaction 1.