The fe(cn)6- complex ion is known to have octahedral geometry. explanation of its bonding includes all of the following except

bond angles of 90º
molecular geometry that is the same as the electron geometry
expanded octet
resonance structures

50 pts plz what is the physical state of matter of baking soda.

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.

How is the way a mixture is combined different from how a compound is combined?