How is a compound different from a mixture?

a. it is made of one substance
b. it can not be made of organic materials
c. it cannot be broken down.
d. it can not be seperated by a physical change.

Y=‐1x + 7 if y has a value of ‐24 what is the value of x?

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.

Draw two cyclic constitutional isomers of cis-1