Provide the general form of a second-order rate law for a reaction involving two different reactants A and B and explain how to determine m and n.

• A. rate = k [A]^m [B]^n; determine m and n by varying [A] and [B] independently and observing rate changes.
• B. rate = k [A] [B]
• C. rate = k [A]^2 [B]^2
• D. rate = k [A] + [B]

Answer: (A)