Free Energy

(Lecture id-1127)

TOPICS & OBJECTIVES

1010 - Gibbs Free Energy
    1010 - Provide the definition for Gibbs Free Energy (ΔG = ΔH - TΔS)
    1015 - Understand Gibbs energy (ΔG) is the available (free) energy that can be applied to work.
    1020 - Use qualitative changes in enthalpy and entropy to predict the spontaneity of a process.
    1030 - Identify and give examples of systems that are spontaneous always, never, and only at either high or low temperatures.
    1040 - Know that if ΔG < 0 the process is spontaneous, and if ΔG > 0 it is not spontaneous (in the forward direction).
 
1020 - delta S & delta G of Rxn
    1010 - Define and explain standard conditions.
    1020 - Use standard entropies to calculate the standard entropy change (ΔSËš) for a chemical reaction.
    1030 - State entropy is zero for a perfect crystal at absolute zero temperature. THIRD LAW
    1040 - Relate standard molar entropy to physical state, molar mass, atomic arrangement and molecular complexity.
    1050 - Use ΔSËš and ΔHËš of reaction to determine ΔGËš (and thereby determine spontaneity).
 
1030 - Non-Standard & Equilibrium
    1010 - Understand most chemical reactions do not occur under standard conditions.
    1020 - Solve for ΔG under non-standard conditions (ΔG = ΔGËš + RT ln Q)
    1030 - Recognize that if a system is at equilibrium, ΔG = 0.
    1040 - Relate K to standard ΔGËš and interconvert between them (ΔGËš = - RT ln K )
    1050 - For a standard system that is spontaneous, realize ΔGËš < 0 and is therefore K > 1.
    1060 - For a standard system that is not spontaneous, realize ΔGËš > 0 and is therefore K < 1.
    1070 - For a standard system that has a ΔGËš = 0, realize this system is at equilibrium and K = 1.
 


   ChemLectures™ v. 1.5 © 1992-2024 Nick DeMello Ph.D.