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Chapter 19
Gibbs Free Energy & Entropy
13
Chemistry
10th Grade
03/18/2014

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Term
chemical thermodynamics
Definition
the study of energy and its transformations
Term
entropy
Definition
thermodynamic function; deals with the number of different equivalent energy states in which a system may be found
Term
spontaneous process
Definition
capable of proceeding in a given direction without needing to be driven by an outside force
Term
state functions
Definition
properties lf systems; determined by the conditions of systems, not by how they got to that state [temp, pressure, enthalphy]
Term
reversible process
Definition
can go back & forth between states along the same path
Term
irreversible process
Definition
cannot be reversed to restore the system & its surroundings to their original states
Term
isothermal
Definition
occurs at a constant temperature
Term
2nd law of thermodynamics
Definition
for a process that is spontaneous in one direction, it is non-spon. in the other direction
Term
microstate
Definition
the state of a system at a particular instant
Term
3rd law of thermodynamics
Definition
the entropy of a pure, crystalline solid at an absolute zero temperature is 0
Term
standard molar entropy
Definition
the entropy value for a mole of a substance in its standard state
Term
Gibbs free energy
Definition
state function; G=H-TS
Term
standard free energy of formation
Definition
the change in free energy associated with the formation of a substance from its elements under standsrd conditions
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