In a first-order reaction, if the half-life is 10 minutes, what will be the half

Practice Questions

Q1
In a first-order reaction, if the half-life is 10 minutes, what will be the half-life if the initial concentration is doubled?
  1. 10 minutes
  2. 20 minutes
  3. 5 minutes
  4. 15 minutes

Questions & Step-by-Step Solutions

In a first-order reaction, if the half-life is 10 minutes, what will be the half-life if the initial concentration is doubled?
  • Step 1: Understand what a first-order reaction is. In a first-order reaction, the rate of the reaction depends on the concentration of one reactant.
  • Step 2: Learn about half-life. The half-life is the time it takes for half of the reactant to be consumed.
  • Step 3: Note that for first-order reactions, the half-life formula does not depend on the initial concentration of the reactant.
  • Step 4: Given that the half-life is 10 minutes, this value will not change if the initial concentration is doubled.
  • Step 5: Conclude that the half-life remains 10 minutes even when the initial concentration is increased.
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