Terms in this set (20)
is any property of a system that depends only on the current state of the system, not on the way in which the system got to that state.
Give examples of state functions
Temperature, Gibbs Free energy, Enthalpy, Entropy, Pressure.
Delta H is...
Delta H is enthalpy, which is measured in joules. It is the sum of internal energy (the total of kinetic energy due to the motion of molecules and the total potential energy associated with the vibrational and electric energy of atoms within molecules. Internal energy qualifies as a state function.
Identify favorable Spontaneous reactions. Go!
Delta H (standard) < 0 AND delta S (standard) > 0.
Delta H (standard) > 0 AND delta S (standard) < 0.
Favorable or spontaneous reactions for delta G (standard) is....
delta G (standard) < 0
Unfavorable delta G (standard) conditions is...
delta G (standard) > 0
When delta H is less than zero, that signifies a ________________ reaction
When delta H is greater than zero, that signifies a _____________ reaction
Thermodynamics can tell you the _______________in which a process will occur, but it can say nothing about the ___________of the process.
Spontaneous processes can be fast or slow. (True or False)
Standard conditions are...
1M, 1 atm, solid or liquid is pure, and at 298K
How do you know which reaction has more positional entropy when both reactions are gaseous reactions?
In general, when a reaction involves gaseous molecules, the change in positional entropy is dominated by the relative numbers of molecules of gaseous reactants and products.
The change in enthalpy determines if a reaction is....
endothermic or exotermic
The change in free energy determines if a process is...
spontaneous or non
A perfect crystal represents the _________ _____________ _____________.
lowest possible entropy (the entropy of a perfect crystal at 0 K is zero).
How do you calculate delta G (standard)?
delta G (standard) =delta H (standard)-T *delta S (Standard)
Reactions proceed until they reach an _________________.
The free energy of a reaction system changes as the reaction proceeds, because the free energy is dependent on___________ of a gas or on the concentration of species in solution.
Entropy does not depend on pressure. (True or False).
The change in free energy is also important because it can tell us how much work can be done in the process. The maximum possible useful work obtainable from a process at constant temperature and pressure is equal to the change in ____________ _______________.
Wmax = delta G
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