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For a reaction A → B, if the rate of reaction doubles when the concentration of

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Question: For a reaction A → B, if the rate of reaction doubles when the concentration of A is doubled, what is the order of the reaction with respect to A?

Options:

  1. Zero order
  2. First order
  3. Second order
  4. Third order

Correct Answer: First order

Solution: 

If doubling the concentration of A doubles the rate, the reaction is first order with respect to A.

For a reaction A → B, if the rate of reaction doubles when the concentration of

Practice Questions

Q1
For a reaction A → B, if the rate of reaction doubles when the concentration of A is doubled, what is the order of the reaction with respect to A?
  1. Zero order
  2. First order
  3. Second order
  4. Third order

Questions & Step-by-Step Solutions

For a reaction A → B, if the rate of reaction doubles when the concentration of A is doubled, what is the order of the reaction with respect to A?
Correct Answer: First order
  • Step 1: Understand that the rate of a reaction depends on the concentration of the reactants.
  • Step 2: Identify the reaction: A → B.
  • Step 3: Note that the rate of reaction is how fast A turns into B.
  • Step 4: Recognize that if the concentration of A is doubled, we are changing the amount of A available for the reaction.
  • Step 5: Observe that when the concentration of A is doubled, the rate of reaction also doubles.
  • Step 6: This means that the rate is directly proportional to the concentration of A.
  • Step 7: In chemical kinetics, if doubling the concentration of a reactant doubles the rate, the reaction is first order with respect to that reactant.
  • Reaction Order – The order of a reaction indicates how the rate is affected by the concentration of reactants.
  • Rate Law – The rate law expresses the relationship between the rate of a chemical reaction and the concentration of its reactants.
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