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What is the half-life of a first-order reaction?

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Question: What is the half-life of a first-order reaction?

Options:

  1. Constant and independent of initial concentration
  2. Depends on initial concentration
  3. Increases with time
  4. Decreases with time

Correct Answer: Constant and independent of initial concentration

Solution: 

The half-life of a first-order reaction is constant and independent of the initial concentration of the reactant.

What is the half-life of a first-order reaction?

Practice Questions

Q1
What is the half-life of a first-order reaction?
  1. Constant and independent of initial concentration
  2. Depends on initial concentration
  3. Increases with time
  4. Decreases with time

Questions & Step-by-Step Solutions

What is the half-life of a first-order reaction?
  • Step 1: Understand what a first-order reaction is. It is a type of chemical reaction where the rate depends on the concentration of one reactant.
  • Step 2: Learn about half-life. Half-life is the time it takes for half of the reactant to be used up in a reaction.
  • Step 3: Know that for first-order reactions, the half-life is always the same, no matter how much reactant you start with.
  • Step 4: Remember the formula for half-life in first-order reactions: t(1/2) = 0.693 / k, where k is the rate constant.
  • Step 5: Conclude that the half-life is constant and does not change with the initial amount of reactant.
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