Why are ionic crystals soluble in water?

Asample of the male sex hormone testosterone, c19h28o2, contains 3.88×10^21 atoms of hydrogen.(a) how many atoms of carbon does it contain? (b) how many molecules of testosterone does it contain? (c) how many moles of testosterone does it contain? (d) what is the mass of this sample in grams?

Consider the nuclear equation below. 239/94 pu—-> x+ 4/2 he. what is x?

What term is missing from the central region that describes hypotheses, theories, and laws? popular predictable mathematical falsifiable