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What is the rate law for a second-order reaction?

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Question: What is the rate law for a second-order reaction?

Options:

  1. Rate = k[A]
  2. Rate = k[A]^2
  3. Rate = k[A][B]
  4. Rate = k[A]^2[B]

Correct Answer: Rate = k[A]^2

Solution: 

For a second-order reaction with respect to A, the rate law is Rate = k[A]^2.

What is the rate law for a second-order reaction?

Practice Questions

Q1
What is the rate law for a second-order reaction?
  1. Rate = k[A]
  2. Rate = k[A]^2
  3. Rate = k[A][B]
  4. Rate = k[A]^2[B]

Questions & Step-by-Step Solutions

What is the rate law for a second-order reaction?
  • Step 1: Understand that a second-order reaction means the rate of the reaction depends on the concentration of one reactant squared.
  • Step 2: Identify the reactant involved in the reaction, which we will call A.
  • Step 3: Write the general form of the rate law, which is Rate = k[A]^n, where n is the order of the reaction.
  • Step 4: Since this is a second-order reaction, set n = 2.
  • Step 5: Substitute n into the rate law to get Rate = k[A]^2.
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