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the rate laws were determined for the following reactions: Reaction 1: rate= k[A] ^2 reaction 2 rate = k [A] [B] ^1/2 reaction 3 rate = k [A]^2 [b]^2 reaction 4 rate k= [A] [B] ^2 reaction 5 rate= K= [A] ^2 [B]^-1 give the number of reactions that can be elementary reactions?? which ones are the right ones and why?