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Define the following terms:
$(1)$ Elementary reaction
$(2)$ Complex reaction
$(1)$ Elementary reaction
$(2)$ Complex reaction
(N/A) $1$. Elementary reaction: $A$ reaction that takes place in a single step and involves no reaction intermediates is called an elementary reaction.
$2$. Complex reaction: $A$ reaction that takes place in two or more steps and involves one or more reaction intermediates is called a complex reaction.
$2$. Complex reaction: $A$ reaction that takes place in two or more steps and involves one or more reaction intermediates is called a complex reaction.
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