Free Energy and Thermodynamics

What information do we need to perform a calculation of Gibbs Free Energy?

• Enthalpy of the reaction.

• Entropy of the reaction.

• The temperature of the reaction in Kelvin.

• All of the above are needed.

Which of the following would most likely lead to a spontaneous reaction.

• A high negative enthalpy.

• A low negative enthalpy.

• A high positive enthalpy.

• A low positive enthalpy.

A reaction has a positive ΔH and a positive ΔS. Which of the following is true?

• It will be spontaneous at all temperatures.
• It will be nonspontaneous at all temperatures.
• It will be spontaneous at low temperatures.
• It will be spontaneous at high temperatures.

Your enthalpy is high and negative but your entropy is also negative. What type of temperature would you want to get a spontaneous reaction?

• low

• high

Which combination of ΔH and ΔS NEVER has a spontaneous reaction?

• +ΔH and +ΔS

• +ΔH and -ΔS

• -ΔH and -ΔS

• -ΔH and +ΔS

For the process at 25⁰C : I₂(g) →I₂(s). What are the signs for ΔG, ΔH and ΔS?

• ΔG + ΔH - ΔS -

• ΔG - ΔH - ΔS -

• ΔG - ΔH + ΔS +

• ΔG - ΔH + ΔS +

Which state of H₂O  has the greatest entropy?

• Ice
• Water
• Vapor

Which statement is true about the ENTROPY?

• Entropy refers to DISORDER, the unusable energy that escapes a system.
• Entropy refers to the balance of temperature among two or more systems.
• Entropy refers to the average kinetic energy of the molecules.
• Entropy refers to the inability to destroy or create energy. 

As a system becomes more disordered, entropy

• remains the same
• increases
• decreases
• cannot be determined

The first law of thermodynamics is a restatement of the

• Zeroth law of thermodynamics
• law of heat addition
• principle of entropy
• conservation of energy