Which of the following statements correctly describe the half-life of a reaction? Select all that apply. Check all that apply. The half-life of a first-order reaction is independent of the initial concentration. The half-life of a reaction is related to its rate constant. The half-life of a reaction is the time taken for (A)to drop to half its original value. A chemical reaction is complete after two half-lives have passed. The half-life of a reaction is always a constant value.