If it takes 30 seconds for a reactant concentration to decrease from 1.0 m to 0.5 m in a first-order chemical reaction, then what is the rate constant for the reaction? a. 0.033 s^–1 b. 0.046 s^–1 c. 0.023 s^–1 d. 43 s^–1

Lab reagent, hypothesis test.a reference solution used as a lab reagent is purported to have a concentration of 5 mg/dl. six samples are taken from this solution and the following concentrations are recorded: (5.32, 4.88, 5.10, 4.73, 5.15, 4.75) mg/dl.these six measurements are assumed to be an srs of all possible measurements from solution.they are also assumed to have a standard deviation of 0.2, a normal distributin, and a mean concentration equal to the true concentration of the solution.carry out a significance test to determine whether these six measurements provide reliable evidence that the true concentration of the solution is actually not 5 mg/dl.