Which of the following statements are true? Choose all that apply.
(A) LeChatelier's principle would predict that the higher the pressure of ethylene in the reactor, the more the product side is favored.
(B) Over the course of reaction, pi bonds (secondary bonds) are converted to lower-energy sigma (single) bonds, releasing energy and causing the reaction to be exothermic; therefore, raising the temperature would push the reaction towards the reactant side.
(C) If the pressure inside the reactor were raised with a different, inert gas like nitrogen or argon which could not participate in the reaction, it would push the reaction towards the product side because the reactant is a gas, but there are no product gasses.
(D) Adding more catalyst will shift the equilbrium towards products, because catalysts help to move reactions forward.
(E) For the reverse reaction -- cracking hydrocarbons to make ethylene -- preferred reaction conditions would be lower pressures and higher temperatures.