Elemental chlorine (cl2) is not a compound because a. it is not a molecule. b. it has only one kind of atom. c. it is a mixture. d. it is inorganic.

Air initially at 0.75 bar, 1000 k, and occupying a volume of 0.12 m^3 undergoes two processes. process 1-2: the air is compressed isothermally until the volume is halved. process 2-3: the air undergoes a constant pressure process until the volume is halved again. assume ideal gas behavior. a) determine the mass of the air, in kg. b) the work and the heat transfer for each of the two processes, in kj. (100 kj = 1 bar . m^3)

At very high pressures, gases become and will eventually a) more dense; become hotter b) more dense; change to a liquid or solid c) less dense; combust d) less dense; turn into a liquid

Within a pendulum, as potential energy decreases, energy increases. a. heat b. kinetic c. frictional d. gravitational