Thermochemistry Flashcards
State Functions
Independent of how current state was reached.
Examples: Gibbs free energy, entropy.
Contrast with path functions, which depend on how a state was reached. Examples: heat, work
State Functions
Enthalpy (H)
State Functions
Hess’s law
Total enthalpy change of a reaction is the sum of the enthalpy changes of individual parts.
State Functions
Entropy (S)
Measure of how energy is spread out in a system. Entropy is maximized at equilibrium.
Systems and Processes
Open systems
Exchange both matter and energy with environment.
Systems and Processes
Closed systems
Exchange energy but not matter with environment.
Systems and Processes
Isolated systems
Exchange neither matter nor energy with environment.
Systems and Processes
Adiabatic process
Exchange no heat with the environment.
Equation for Heat (q)
Definition of temperature (T)
Measure of the average kinetic energy of a substance.
Gibbs Free Energy
Gibbs free energy formula
Gibbs Free Energy
In redox reaction under standard conditions
Gibbs Free Energy
Spontaneity by Gibbs free energy
Gibbs free energy gives the spontaneity reaction of a reaction
Spontaneous if
∆G < 0
Equilibrium if ∆G = 0
Non-spontaneous if ∆G > 0
Gibbs Free Energy
Exergonic Reaction
