Answer:
B. rate = K[A]²
Step-by-step explanation:
In a second-order reaction, the rate of the reaction is proportional to the square of the concentration of a single reactant (denoted as [A]), which is represented by the squared term [A]².
This expression signifies that the reaction rate increases exponentially with the concentration of reactant A.
The rate constant K determines the specific rate of the reaction. Option B correctly represents this relationship for a second-order reaction. Option C, which includes the concentration of a second reactant (denoted as [B]), does not accurately represent a second-order reaction.
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