Which of the following would be a good definition for energy?
A. Something you hold in your hand.
B. Saving energy through using your
bicycle.
C. measure of a substance's ability to do
work (make something move) or
cause a change in matter
B. spinning top on a table.

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