Thermochemistry Lectures & Notes
Chapter 6
Use the Content Goals as your guide to incorporate new and old material
Review
|
New
|
Review & New from L.C. Lee under Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.
Content Goals
Chapter Outline
Technology Goals
|
Internal Energy, Heat and Work
This section focuses upon a review of previous definitions (kinetic and potential energy for example) and introduction of new concepts.
Chapter Review Problems
Eqw_AP_Probs.docx Enthalpy & Calorimetry
Chapter Review Problems
WorksheetOnCalorimetry.pdf (answers included) |
Hess's Law
from chem.ufl.edu
To this point, you know energy flowing into the system means endothermic (q, w and H are positive); and energy released by the system means exothermic (q, w and H are negative). Further, you know that H = q under constant pressure (see the algebraic manipulation of equations on p. 234-236); meaning a change in enthalpy (H) is equal to the energy flow as heat (q).
Therefore, the change in enthalpy in going from an initial state to a final state (a particular set of reactants to a particular set of products) is the same no matter the pathway, one step or a series of steps, i.e., the change in enthalpy for a reaction is a sum of the enthalpy changes involved.
Therefore, the change in enthalpy in going from an initial state to a final state (a particular set of reactants to a particular set of products) is the same no matter the pathway, one step or a series of steps, i.e., the change in enthalpy for a reaction is a sum of the enthalpy changes involved.
|
|
Chapter Review Problems
HessLawMusallman.docx
- 60 - 64
- 6.3: 18, 19, 20
HessLawMusallman.docx
Enthalpy of Formation & Heats of...
A few more ideas to keep track of: (1) standard state refers to specific conditions (in the first show me and listed on p. 246); (2) formation is from elements (listed appendix 4); (3) enthalpy of formation is per mole. Lastly, 'heats of' refers to the enthalpy change associated with a particular change in matter: heat of combustion, heat of solvation, heat of vaporization, etc.
|
Summary Reminders:
|
Chapter Review Problems
APChemEnthalpyFormation.docx
- 67, 69, 74, 79, 98
- 6.4: 22, 23
APChemEnthalpyFormation.docx