Home > Flashcards > Print Preview
The flashcards below were created by user
p.reilly1227
on FreezingBlue Flashcards. What would you like to do?

 author "me"
 tags ""
 description ""
 fileName "General chemistry 3 Thermodynamics"
 freezingBlueDBID 1.0
 Def thermodynamics
 The study of how energy effects a macroscopic system

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

How to intuitively understand heat flow
Imagine it is fluid

What is chemical work, and what is the equation
 Pressure volume work
 W=PΔV pressure must be constant

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

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

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: 13

What is the average kinetic energy of any fluid
3/2KT

Define Enthalpy. Define Change in Enthalpy
 H=U+PV
 ΔH=ΔU+ΔPV p must be constant

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

Define Hess's Law and what negative and positive values mean
 ΔH(rxn)=ΔH(products)ΔH(reactants)
 ΔH= exothermic/spontaneous
 +ΔH= endothermic/nonspontaneous

Give entropy and Gibbs free energy equation
 ΔS(universe)=ΔS(system)+ΔS(surroundings)
 ΔG=ΔHTΔS (ΔG is a spontaneous reaction)

