Chelsea thinks that in order to find the atomic mass shown for each element on the periodic table, scientists took the average of the masses of all of that element's isotopes. Is she correct or incorrect? Why?

How does a catalyst increase the speed of a reaction? a. the catalyst eliminates the activated complex stage, allowing products to form immediately. b. the catalyst lowers the energy level of the reactants, making it easier for them to react. c. the catalyst makes it easier for the activated complex to form, lowering the activation energy. d. the catalyst raises the energy level of the products, making the reaction finish sooner. reset next