Q: Condensation, melting, deposition, sublimation, vaporization, and freezing are all considered changes in what? Choices: - density - altitude - speed - state A:
state

Q: What is the main organ required for respiration in mammals? Choices: - the diaphragm - the heart - the brain - the lungs A:
the lungs

Q: The geometry of the bf 3 molecule is called what? Choices: - fractal planar - spherical planar - distorted planar - trigonal planar A:
trigonal planar