Unit 6: Thermochemistry

Unit 6 Learning Targets/Objectives per topic

Topic 6.1: Endothermic and Exothermic Processes

• I can explain the relationship between experimental observations and energy changes associated with a chemical or physical transformation.

• I can determine the direction of flow of heat by knowing the temperature difference between two substances.

• I can explain how the formation of a solution maybe an exothermic or endothermic depending on the relative strengths of intermolecular interactions before and after the dissolution.

Topic 6.2: Energy Diagrams

• I can represent a chemical reaction or a physical transformation with an energy diagram.

• I can label the energy of reactants, energy of products, enthalpy as well as the activation energy of a forward and a eversible reactions on an energy diagram.

Topic 6.3: Heat Transfer and Thermal Equilibrium

• I can explain the relationship between transfer of thermal energy and molecular collisions.

• I can define thermal equilibrium.

Topic 6.4: Heat Capacity and Calorimetry

• I can calculate the heat absorbed or released by a system undergoing heating/cooling based on the amount of the substance, the heat capacity and the change in Temperature.

• I can use the equation Q=m. c. (Tf-Ti) to calculate the heat exchanged in a chemical reaction or a physical transformation.

• I can define specific heat capacity and the molar heat capacity of a substance and use them in calculating the amount of heat released/absorbed in a transformation.

Topic 6.5: Energy of Phase Changes

• I can explain the 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 in the molar enthalpy of the phase transition.

Topic 6.6: Introduction to Enthalpy of Reaction

• I can calculate the heat 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 the reaction.

Topic 6.7: Bond Enthalpies

• I can calculate the enthalpy change of a reaction based on the average bond energies of bonds broken and bonds formed.

Topic 6.8: Enthalpy of Formation

• I can calculate the enthalpy change for a chemical or physical process based on the standard enthalpies of formation.

• I can use tables of standard enthalpies of formation to calculate the standard enthalpies of reactions.

Topic 6.9: Hess's Law

• I can represent a chemical or a physical process as a sequence of steps.

• I can apply Hess's law to calculate the energy of an overall reaction taking place in multi-steps.

Unit 6 Notes Summary