Robbie is having a hard time opening the metal lid on a jar of pickles. Robbie decides to run hot
water over the lid. The hot water warms up the
metal, which causes it to expand a little farther
from the jar. Now the jar is easier to open. This is
an example of
thermal expansion
O evaporation
sublimation
thermal contraction

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.

I’m an electrically neutral atomic any element, there are equal numbers of

If a solution contains 3 moles/liter of sodium chloride (nacl, made of sodium ions and chloride ions), what is the osmolarity of this solution