Reaction Feasibility, standard enthalpy of formation and entropy Flashcards
Physical Chem
what is thermochemistry?
the study of changes in energy which occur during such reactions
what is meant by an element in its standard state?
the most stable state of the substance under standard conditions
what is meant by a feasible reaction?
a reaction that occurs at a particular temperature
what is the entropy?
the degree of disorder or randomness in a system
what is meant by a high absolute entropy value?
there is a greater degree of disorder
what does a high molecular weight indicate?
a higher entropy value
what does the feasibility of a reaction depend on?
the enthalpy, entropy and the temperature
what is Gibbs standard free energy?
a measure of pressure
what is the equation for standard free energy?
∆G°= ∆H° - T∆S°
what can the equation determine?
whether the reaction is feasible
what indicates if the reaction is feasible?
if ∆G° is equal to or less than zero
what conditions are essential for the reaction to be spontaneous?
∆G° must be less than zero and the activation energy must be low enough for the reaction to occur under standard conditions
