A46.9 gram sample of a substance has a volume of about 3.5 centimeters3. it is solid at a room temperature of 23ºc. out of the four substances whose properties are given, which is the most likely identity of this substance? substance density (g/cm3) melting point (°c) boiling point (°c) molybdenum 10.28 2,623 4,639 mercury 13.53 -39 357 hafnium 13.31 2,233 4,603 lead 11.34 327 1,749 a. molybdenum b. mercury c. hafnium d. lead

Which of the following units is not an official si unit? mole liter kilogram ampere

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.

Some liquids can be distilled, but only at temperatures that are so high that it is impractical, or so high the compound decomposes. explain why distillation such compounds at significantly less than atmospheric pressure (some degree of vacuum) would solve this problem.