Calculate the energy released, in kJ, when 10.3 moles of compound NB4 condenses from a gas to a liquid at 27°C.

Joseph has hypothesized that sound travels in waves. if he were following the scientific method, what should he do next? a. ask a question. b. test the hypothesis. c. study the results. d. tell other scientists about his hypothesis.

Most materials are not magnetic because their magnetism has worn off. their magnetic domains are arranged randomly. they lack magnetic fields. earth’s heat has destroyed their magnetism.

Who examines and coordinates the cleanup of polluted sites?