According to the kinetic-molecular theory, the collision between two ideal gas particles is a result of
a. neither attraction nor repulsion.
b. repulsion from the wall of the container.
c. repulsion from other gas particles.
d. attraction between the two particles.

Which statement is true about a catalyst? a: a catalyst decreases the rate of the reaction. b. a catalyst is consumed during a chemical reaction. c. a catalyst lowers the activation energy of a reaction. d. a catalyst increases the reactant concentration during a reaction.