SAT Chemistry

Category - Multiple Choice

What is the order of reaction for the following equation?

A + B --> 2C
  1. Zero order
  2. First order
  3. Second order
  4. Third order
  5. 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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