Which rule concerning oxidation numbers is true? A. When a redox reaction occurs, there will always be at least one atom that is oxidized and at least one atom that is reduced.
B. Oxidation is the process by which an atom loses electrons.
C. Reduction is the process by which an atom gains electrons.
D. All of the Above
E. None of the Above

Why are people not able to skip a dive to the deepest part of the ocean

Anurse used a 0.02-mg/l solution of disinfection to clean a patients wound. what is the concentration of the solution expressed as a percentage?

How does a sample of helium at 15 degree celsius compare to a sample of helium at 215 k? a) the helium at 15 degrees celsius has a higher average kinetic energy that the sample at 215 k. b) the helium at 15 degrees celsius has lower nuclear energy that the sample at 215 k. c) the helium at 15 degrees celsius has slower- moving atoms that the sample at 215 k. d) the helium at 15 degrees celsius has smaller atoms than the sample at 215 k.