A)Even though some reactions can occur on their own, a catalyst may the energy barrier required to complete the reaction. b)If combustion reactions produce Carbon dioxide and water, which are relatively harmless, how do other pollutants like CO and NOx form which need to be oxidized and reduced by catalytic converters? (hint, think in terms of stoichiometry).
c)Carbon Monoxide is and NOx is during these reactions.
d)Does the catalyst get used up during a reaction? Why is this convenient?