Question: (a) Can an intermediate appear as a reactant in the first step of a reaction mechanism? (b) On a reaction energy profile diagram, is an

(a) Can an intermediate appear as a reactant in the first step of a reaction mechanism? 

(b) On a reaction energy profile diagram, is an intermediate represented as a peak or a valley? 

(c) If a molecule like Cl2 falls apart in an elementary reaction, what is the molecularity of the reaction?

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