How can you tell when a solid substance dissolves in water and does not react?
A. Gas bubbles form in the water.
B. The substance starts to fizz in the water and gives off an odor.
O C. When the water evaporates, the substance is left behind.
O D. The water changes color and grows warm.

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.