Why was it difficult for dalton to prove his theory? . a.. people did not believe that solids could be made of small particles. c.. only very powerful, expensive microscopes could be used in his experiments. b.. atoms are too small to see. d.. he could not keep atoms in a stable form

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