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SAT Chemistry

Category - Multiple Choice

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What is the order of reaction for the following equation?

A + B --> 2C

Zero order
First order
Second order
Third order
Fourth order

Explanation

Answer: C, second order. Solution is as follows:

r=k[A]¹[B]¹ where the “1” comes from the stoichoimetry. Only the reactants are used when determining rate. The order of a reaction is the sum (in this case 1+1). Thus, it is second order.

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