what is volume of air needed for incomplete combustion of 100cm^3 of ethene to form water and carbon monoxide only

Asample of aluminum foil contains 8.60 × 1023 atoms. what is the mass of the foil?

If a polyatomic ionic compound has gained two hydrogen ions, then how does its name begin?

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.