The half-life of a first-order reaction is independent of the initial concentrat
Practice Questions
Q1
The half-life of a first-order reaction is independent of the initial concentration of the reactant. What is the expression for the half-life (t1/2) of a first-order reaction? (2020)
t1/2 = 0.693/k
t1/2 = k/0.693
t1/2 = 1/k
t1/2 = k/1
Questions & Step-by-Step Solutions
The half-life of a first-order reaction is independent of the initial concentration of the reactant. What is the expression for the half-life (t1/2) of a first-order reaction? (2020)
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 (t1/2) is the time it takes for half of the reactant to be consumed.
Step 3: Know that for first-order reactions, the half-life does not change with different starting amounts of reactant.
Step 4: The formula for the half-life of a first-order reaction is t1/2 = 0.693/k, where k is the rate constant.
Step 5: Recognize that since the formula does not include the initial concentration, the half-life is independent of it.
