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The half-life of a first-order reaction is dependent on which of the following?

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Question: The half-life of a first-order reaction is dependent on which of the following?

Options:

  1. Initial concentration
  2. Rate constant
  3. Temperature
  4. All of the above

Correct Answer: Rate constant

Solution: 

The half-life of a first-order reaction is given by t1/2 = 0.693/k, which depends only on the rate constant.

The half-life of a first-order reaction is dependent on which of the following?

Practice Questions

Q1
The half-life of a first-order reaction is dependent on which of the following?
  1. Initial concentration
  2. Rate constant
  3. Temperature
  4. All of the above

Questions & Step-by-Step Solutions

The half-life of a first-order reaction is dependent on which of the following?
Correct Answer: Rate constant (k)
  • 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. The half-life is the time it takes for half of the reactant to be used up in the reaction.
  • Step 3: Know the formula for half-life in a first-order reaction, which is t1/2 = 0.693/k.
  • Step 4: Identify the components of the formula. Here, 't1/2' is the half-life, and 'k' is the rate constant of the reaction.
  • Step 5: Realize that the half-life (t1/2) only depends on the rate constant (k) and not on the initial concentration of the reactant.
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