●EXPANDED TOPICS: The discussion of energy, for example, was expanded to support content referencing energy that appears before chapter 7.●REORGANIZED END-OF-CHAPTER QUESTIONS support the special attention paid to the fluidity of topics relative to learning through the atoms first approach.●REACTION ENTHALPY ESTIMATIONS from bond enthalpy was moved from chapter 3 to chapter 7 so that it appears after students have studied reactions in more detail.●INCREASED CLARITY: Since nomenclature appears in later chapters, both formulas and names of molecules are referenced to not assume students have a prior knowledge of nomenclature.●LADDERED ASSESSMENT SETS: Laddered Assessments are new assignment sets in OWLv2 that combine conceptual modules with more traditional homework questions. This provides students a structured learning path to bolster their skills. Students start with conceptual exercises like tutorials and simulations, then practice single concepts and skills in Mastery, then finally