6. identify the number of neutrons in one atom of silicon with an isotopic mass number of 28 amu.

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.

Draw the lewis dot structure for each of the following polyatomic ions

What is the area in square meters of 448 g ai foil that has a thickness of 23921 nm? the density is 2.70 g/cm