1) How can particles combine together to form the variety of matter one observes? 2) How can we use the periodic table to predict the properties and the behavior of an element?
3) Where do elements come from?

Which characteristics can be used to differentiate star systems? check all that apply.

You just calculated that the heat of fusion for chloromethane is 6400 j/mol. the heat of fusion for hydrogen is 120 j/mol.? which of the following account for this difference? more than one correcta. chloromethane can absorb more energy at the same temperature. b. hydrogen has stronger intermolecular forces than chloromethane. c. hydrogen molecules can pack more closely than chloromethane molecules. d. chloromethane experiences dipole-dipole interactions. e. chloromethane has a higher molar mass than hydrogen.

Why does ammonia, nh3, behave as a base when it reacts with an acid? z