Based on the activity series, which one of the reactions below will occur? zn (s) + mni2 (aq) ? zni2 (aq) + mn (s)sncl2 (aq) + cu (s) ? sn (s) + cucl2 (aq)2agno3 (aq) + pb (s) ? 2ag (s) + pb(no3)2 (aq)3hg (l) + 2cr(no3)3 (aq) ? 3hg(no3)2 + 2cr (s)3febr2 (aq) + 2au (s) ? 3fe (s) + 2aubr3 (aq)

The electron configuration for chromium is 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 3 d 5 4 s 1 instead of 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 3 d 4 4 s 1 . the configuration is an exception to the

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.

The polymer used for the nonstick surface of cooking utensils is 24.0%c and 76%f by mass. what is the empirical formula of this polymer?