Which statement best summarizes the second law of thermodynamics? A. The total disorder of a system and it’s surroundings tend to increase
B. Energy cannot be created or destroyed
C. Energy is lost when it changes form
D. A system and it’s surroundings tend toward a state of increased order

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