The activation energy of a reaction going on its own is 20 kJ. If the reaction was treated with a catalyst, which would most likely represent the amount of energy needed to start a reaction? 15 kJ 20 kJ 25 kJ 30kJ

catalyst works by lowering the activation energy required for a reaction to proceed. Therefore, if the original activation energy of the reaction is 20 kJ and the reaction is treated with a catalyst, the amount of energy needed to start the reaction would likely be less than 20 kJ.<br /><br />Among the given options, 15 kJ is the only value that is lower than 20 kJ. Thus, the most likely amount of energy needed to start the reaction with a catalyst would be:<br /><br />15 kJ