alleryStart learning →What is an intermediate in a reaction mechanism?
AA species that never takes part at all
BA species added to lower the energy barrier
CA species present before and after the change
DA species made in one step and used in another
Answer & Solution
Correct answer: D. A species made in one step and used in another
1. In ozone decomposition the first step makes an oxygen atom and the second step uses it up.
2. A species produced in one step and consumed in a later one is an intermediate.
3. Because it is made and then used, it does not appear in the overall equation.
4. A species present both before and after the change without being used up is a catalyst, not an intermediate.
_Source: OpenStax Chemistry (CC BY 4.0), Ch 12 "Kinetics", section 12.6 Reaction Mechanisms_
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