Question

Which of the following statements are true regarding intermediate species? Intermediates can appear in the rate...

Which of the following statements are true regarding intermediate species?

Intermediates can appear in the rate law expression.

Intermediates cannot appear in the rate law expression.

Intermediates produced in one step of a mechanism must be consumed in other steps of the mechanism.

An intermediate produced in one step of a mechanism must be consumed in the next step of the mechanism.

B only

B and C only

A only

A and D only

Science   Chemistry   
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Answer #1

Most chemical reactions proceed stepwise. A reaction intermediate is transient species produced in a multi-step reaction, it is produced in a preceding step and consumed in a subsequent step to form the product and other types of reactive intermediates. The lifetime of an intermediate is generally short as it is consumed to make the next product of the reaction sequence. So it cannot not appear in the overall rate law expression. So correct options are B and C.

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