According to the assumptions upon which most reaction mechanisms are based, collisions must occur in order for a chemical reaction to occur, but: a. energy is destroyed in these collisions. b. some molecules react with each other without colliding. c. there are very few collisions every second. d. not every collision results in a reaction. e. only certain collisions will increase the energy of the reaction.

Liquid ammonia is produced at high temperatures and under great pressure in a tank by passing a mixture of nitrogen gas and hydrogen gas over an iron catalyst. the reaction is represented by the following equation. n2(g) + 3h2(g) → 2nh3(g) changing all but one experimental condition will affect the amount of ammonia produced. that condition is a) increasing the concentration of both reactants b) changing the temperature within the tank c) decreasing the pressure within the tank. d) increasing only the amount of nitrogen present.