Rank the following solutions from the highest [H3O+] (1) to the lowest [H3O+] (5).

[H3O+] = 3.16 × 10–4 M
[OH–] = 4.35 × 10–2 M
pH = 1.05
pOH = 7.0
pOH = 4.0

If 90.0 grams of ethane reacted with excess chlorine,how many grams of dicarbon hexachloride would form

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.

Elements in group 2 are all called alkaline earth metals. what is most similar about the alkaline earth metals?