A 25 g piece of copper wire is heated and the temperature of the wire changes from 20C to 75C. The amount of heat absorbed is 250 cal. What is the specific heat of copper?

Nonpoint source pollution is difficult to control because it

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.

The number of neutrons is equal to the atomic number minus the atomic mass. a. true b. false