Question

question 1
a reaction mechanism is
the balanced equation representing a chemical reaction.
a list of all reacting species.
the step - by - step sequence of elementary processes during a chemical reaction.
a list of all products formed.

Explanation:

A reaction mechanism details the individual elementary - steps that occur during a chemical reaction. It is not just the balanced equation, a list of reactants, or products.

Answer:

The step - by - step sequence of elementary processes during a chemical reaction.