Gibbs Free Energy and Spontaneity
Practice Questions
AP Chemistry › Gibbs Free Energy and Spontaneity
If a reaction has a positive value for its enthalpy and a negative value for its entropy, which of the following is true?
The entropy and enthalpy of a reaction are both negative. Is the reaction spontaneous?
Calcium carbonate is formed from calcium oxide and carbon dioxide.
Given that this reaction is spontaneous at low temperatures and non-spontaneous at high temperatures, what must be true about the change of enthalphy (
A chemical reaction has the following changes in enthalpy and entropy.
What is the temperature range for this reaction that allow it to be spontaneous?
Suppose that a reaction with an equilibrium constant equal to 
If the reaction quotient (Q) is greater than the equilibrium constant (K), what is true about the Gibbs free energy?
Of the following reactions, which of the following is only spontaneous at high enough temperatures?
Suppose that a rxn has ∆H = -28 kJ and ∆S= -60 J/K. At what temperature will it
change from spontaneous to non-spontaneous?
What must be true of a spontaneous process?
Na(s) + 1/2 Cl2(g) → NaCl (s)
The Standard Heat of formation for NaCl is -411.1 kJ
Which of the following descriptions accurately describes the reaction above?