Which is a postulate of the kinetic-molecular theory?
1.) gas particles have a small volume relative to the spaces between them.
2.) gas particles have a large volume relative to the spaces between them.
3.)gas particles are very small in size and always move slowly.
4.)gas particles are very large in size and always move slowly.

The equation below shows the reaction of zinc with hydrochloric acid (hcl). zn (s) + 2 hcl (aq) —> zncl2 (aq) + h2 (g) what will happen if the concentration of hcl is decreased? a. more zncl2 will be produced. b. the reaction rate will slow down. c. the hydrochloric acid will become more acidic. d. the reaction will produce water instead of hydrogen gas.