Reaction Feasibility? Flashcards
The standard enthalpy of formation represents?
the enthalpy change when one mole of a substance is formed from its elements in their standard states
What is standard state?
most stable state at a pressure of 1 atmosphere and at a specified temperature, usually taken as 298 K
the entropy (S) of a system is a measure of?
the degree of disorder of the system
The greater the degree of disorder?
the greater the entropy
Disorder in solids and gas
Solids have low disorder and gases have high disorder
As temperature increases?
entropy increases
There is a rapid increase in entropy at the ___ point of a substance and an even more rapid and larger change in entropy at the ____ point.
melting
boiling
The second law of thermodynamics states?
that the total entropy of a reaction system and its surroundings always increases for a spontaneous process
Heat energy released by the reaction system into the surroundings
increases the entropy of the surroundings
Heat energy absorbed by the reaction system from the surroundings
decreases the entropy of the surroundings
The third law of thermodynamics states?
that the entropy of a perfect crystal at 0 K is zero
negative delta G
reaction is feasible
What is a feasible reaction?
one that tends towards the products rather than the reactants
At equilibrium delta G
0
