Calculate the number of moles of CuSO4 that were in the impure sample of CuSO4(s).

Joseph has hypothesized that sound travels in waves. if he were following the scientific method, what should he do next? a. ask a question. b. test the hypothesis. c. study the results. d. tell other scientists about his hypothesis.

4. absorption has the highest risk of overdose due to increased potency. a. rectal b. oral c. transdermal d. intranasal

Which class of molecules functions as chemical signals? hormones water carbohydrates proteins