Silver tarnishes in the presence of hydrogen sulfide (produced by rotten eggs) and oxygen because of the reaction below: 4Ag + 2H2S + O2 → 2Ag2S + 2H2O
How many grams of Ag2S could be obtained from a mixture of 0.95 g Ag, 0.140 g H2S and 0.08 g O2 ?

Which statement describes covalent bases? they have hydroxide ions. they produce hydrogen ions. they are often amines. they are named the same as ionic compounds.

Express the following number in scientific notation. 0.026890 =

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.