Mass box A = 10 grams; Mass box B = 5 grams; Mass box C—made of one A and one B How many boxes of A would be required to make 30 grams of C?

Which best describes the activation energy of a chemical reaction? a. the combined energy of all the reactants b. the amount of energy required for a reaction to occur c. the difference in energy between products and reactants d. the potential energy stored in the bonds of reactants and products