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

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

Options:

Correct Answer: Rate constant only

Solution:

The half-life of a first-order reaction is independent of the initial concentration and depends only on the rate constant k.

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

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

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 that for first-order reactions, the half-life is a constant value. It does not change as the reaction proceeds.
Step 4: Recognize that the half-life of a first-order reaction is not affected by how much of the reactant you start with (initial concentration).
Step 5: Understand that the half-life is determined only by the rate constant (k) of the reaction. The rate constant is a value that indicates how fast the reaction occurs.

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