Which half-reaction correctly describes an oxidation? Upper C a (s) plus 2 e superscript minus right arrow upper C a superscript 2 plus (a q). Upper B r subscript 2 plus 2 e superscript minus right arrow 2 upper B r superscript minus. Upper N a superscript plus (a q) right arrow upper N a (s) plus e superscript minus. Upper C r (s) right arrow upper C r superscript 3 plus (a q) plus 3 e superscript minus.

Which statement is true according to the kinetic theory? a. molecules of different gases with the same mass and temperature always have the same average density. b. molecules of different gases with the same mass and temperature always have the same average volume. c. molecules of different gases with the same mass and temperature always have the same pressure. d. molecules of different gases with the same mass and temperature always have the same molecular mass. e. molecules of different gases with the same mass and temperature always have the same average kinetic energy.