Unit 7 - Thermochemistry

Thermochemistry Objectives

6.1 Endothermic and Exothermic Processes - ENE-2.A - Explain the relationship between experimental observations and energy changes associated with a chemical or physical transformation.

6.2 Energy Diagrams - ENE-2.B - Represent a chemical or physical transformation with an energy diagram.

6.3 Heat Transfer and Thermal Equilibrium - ENE-2.C - Explain the relationship between the transfer of thermal energy and molecular collisions.

6.4 Heat Capacity and Calorimetry - ENE-2.D - Calculate the heat q absorbed or released by a system undergoing heating/cooling based on the amount of the substance, the heat capacity, and the change in temperature.

6.5 Energy of Phase Changes - ENE-2.E - Explain changes in the heat q absorbed or released by a system undergoing a phase transition based on the amount of the substance in moles and the molar enthalpy of the phase transition.

6.6 Introduction to Enthalpy of Reaction - ENE-2.F - Calculate the heat q absorbed or released by a system undergoing a chemical reaction in relationship to the amount of the reacting substance in moles and the molar enthalpy of reaction.

6.7 Bond Enthalpies - ENE-3.A - Calculate the enthalpy change of a reaction based on the average bond energies of bonds broken and formed in the reaction.

6.8 Enthalpy of Formation - ENE-3.B - Calculate the enthalpy change for a chemical or physical process based on the standard enthalpies of formation.

6.9a Hess's Law - ENE-3.C - Represent a chemical or physical process as a sequence of steps.

6.9b Hess's Law - ENE-3.D - Explain the relationship between the enthalpy of a chemical or physical process and the sum of the enthalpies of the individual steps.

Thermochemistry Big Ideas

Big Idea 4: Energy (ENE)

• Enduring Understanding ENE-2: Changes in a substance’s properties or change into a different substance requires an exchange of energy

• Enduring Understanding ENE-3: The energy exchanged in a chemical transformation is required to break and form bonds.