# General chemistry 3 Thermodynamics.txt

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• Def thermodynamics
• The study of how energy effects a macroscopic system
1. Define a state function and give rule for determining extensive vs intensive properties. How many state properties are needed to define a system state. How are extensive and intensive properties related
• State function: any 3 states that define a system. One must be extensive
• Rule: imagine an exact duplicate of a system. Then add them together. If the property changes, it is extensive
• 3 state fxns will define any system
• Extensive/extensive=intensive. ie density=mass/vol
2. How to intuitively understand heat flow
Imagine it is fluid
3. What is chemical work, and what is the equation
• Pressure volume work
• W=PΔV pressure must be constant
4. How to think of a heat engine
Think of fluid because it is heat. Then compare to a concentration gradient. Heat flows from hot to cold and can do work. Cold heat must have work done on it to move from cold to hot
5. What are the 7 thermodynamic state functions
• Remember Gibb Has to Pee S T U V
• 1: Gibbs free energy
• 2: Enthalpy
• 3: Pressure
• 4: Enthalpy
• 5: Temperature
• 6: Internal Energy (U)
• 7: Volume
6. What are the 6 types of internal energy, which ones are in the sub category Thermal Energy
• 1: rotational
• 2: Translational
• 3: Vibrational
• 4: Intermolecular Potential
• 5: Electronic
• 6: Great Mass
• Thermal Energy: 1-3
7. What is the average kinetic energy of any fluid
3/2KT
8. Define Enthalpy. Define Change in Enthalpy
• H=U+PV
• ΔH=ΔU+ΔPV p must be constant
9. Define a standard state and standard Enthalpy of Formation
• Standard state: the reference enthalpy value of 0 for any substance. A substance exists in this state at 1 Barr and some specific temp.
• Standard Enthalpy of Formation: the change in H for a rxn that creates 1 mole of a compound from raw elements in their standard state
10. Define Hess's Law and what negative and positive values mean
• ΔH(rxn)=ΔH(products)-ΔH(reactants)
• -ΔH= exothermic/spontaneous
• +ΔH= endothermic/nonspontaneous
11. Give entropy and Gibbs free energy equation
• ΔS(universe)=ΔS(system)+ΔS(surroundings)
• ΔG=ΔH-TΔS (-ΔG is a spontaneous reaction)
 Author: p.reilly1227 ID: 233865 Card Set: General chemistry 3 Thermodynamics.txt Updated: 2013-09-09 22:27:05 Tags: General chemistry Thermodynamics Folders: Description: General chemistry 3 Thermodynamics.txt Show Answers: