The number of neutrons present in the nucleus of an average atom of any given element is best estimated by:-

How has the scientific community addressed the safety of chemicals? a. chemicals are repeatedly tested, even those that have existed for a long time. b. existing chemicals are tested if they have never been tested before. c. chemicals are tested if they are suspected to have caused a problem. d. only new chemicals are tested.

Find the empirical formula of each of the following compounds. given mass or for each element in a sample of the compound 3,611 g ca; 6.389 g c1

How would the number of moles (n) of o2 change if the atmospheric pressure doubled but all other variables stayed the same