Jack's teacher has a box of objects. He asks each student to pull out an object and identify whether it is a mixture or a pure
substance
Jack pulls out a bowl of mixed fruit. What is this object and why is it a mixture or a pure substance?
A.
a pure substance, because there are several things making up the object
B.
c.
a mixture, because there are several things making up the object
a mixture, because it is only composed of one thing
a pure substance, because it is only composed of one thing
D.

Which of the following statements is true about planck’s law

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.

Which symbol can be used to indicate the pressure at which a chemical reaction is carried out? 25°c 2 atm pa