What does Avogadro's number represent? A. How much 1 atom of a substance weighs. B. The number of molecules in 1 mole of a substance. C. The number of molecules in 1 atomic number of a substance. D. How much 1 mole of a substance weighs.

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