2. A first-order reaction is 38. 5% complete in 480 s. A. Calculate the value of the rate constant. B. What is the value of the half-life. C. How long will it take for the reaction to reach 95% completion

Scientists have developed an explanation of a phenomenon from several verified hypotheses. the explanation has been confirmed through numerous experimental tests.which option best describes this explanation? a. scientific lawb. research questionc. hypothesisd. scientific theory