A) How many electron pairs are on the central atom of an
H2S molecule?

Compare and contrast physical changes with chemical changes.

Nonpoint source pollution is difficult to control because it

4. propanol and isopropanol are isomers. this means that they have a) the same molecular formula but different chemical properties. b) different molecular formulas but the same chemical properties. c) the same molecular formula and the same chemical properties. d) the same molecular formula but represent different states of the compound