The mass of a length of metal wire is 45 g. When the wire is placed in a graduated
cylinder with water, it displaces 5 mL of water. What is the density of the metal?
A. 0.1 g/cm3
B. 9 g/cm3
C. 40 g/cm3
D. 225 g/cm3

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 statement best describes the function of enzymes?

Identify the lewis base in this balanced equation: fe3+ h2o fe(h2o)63+