A 17.44 g sample of a hydrate of zinc sulfate is heated in a crucible to drive off all of the water. After heating, the sample has a mass of 9.79g. What is the empirical
formula for this hydrate?

Becquerel expected to find ( he developed the photographic plate that had sun-exposed minerals on top of it. becquerel expected to find ( he developed the photographic plate that had been in the closed drawer.

Which statement is a reason to support population regulation? a) it is unethical for us to control birth control rates b) humans have the freedom to produce as many children as desired c) the gap between the rich and poor has been narrowing since 1960 d) billions more people on the earth will intensify many environmental and social problems

At 300 mm hg, a gas has a volume of 380 l, what is the volume at standard pressure