Gibbs Free Energy Notes

Gibbs Free Energy – Notes

Watch Paul Anderson’s YouTube video on the topics of Gibbs Free Energy. As you watch, try to answer the questions below. http://www.youtube.com/watch? v=DPjMPeU5OeM&feature=BFa&list=PLFCE4D99C4124A27A

Write the equation for Gibbs Free Energy:______

What does Mr. Anderson prefer to call “free energy.”______

What is a spontaneous reaction?______

Define Enthalpy (H) ______

In a spontaneous reaction what happens to enthalpy (H) ______

Where is potential energy found in biology?______

Define Entropy (S) ______

In a spontaneous reaction what happens to entropy (S)______

In a spontaneous reaction what happens to temperature (T)______

To summarize spontaneous reactions for each variable:

 Enthalpy (H) will ↑ or ↓ resulting in a ↑ or ↓ in free energy (G)

 Entropy (S) will ↑ or ↓ resulting in a ↑ or ↓ in free energy (G)

 Temp. (T) will ↑ or ↓ resulting in a ↑ or ↓ in free energy (G)

∆G < 0 ______

∆G > 0 ______

∆G = 0 ______

Overview of Cellular respiration: Glucose → CO2 + H2O

 more or less random ↑ or ↓ entropy (S)

 release or store energy ↑ or ↓ enthalpy (H)  ∆G = ______kcal/mole

 What is needed to get this reaction started:______

Overview of Photosynthesis: CO2 + H2O + Sun + Plant → Glucose

 more or less random ↑ or ↓ entropy (S)

 release or store energy ↑ or ↓ enthalpy (H)

 ∆G =______kcal/mole

 Where does activation energy come from?______

What is the energy coinage of a cell:______

ATP to ADP: ∆G = ______kcal/mole

ADP to ATP: ∆G = ______kcal/mole

Sun to Plant ∆G < 0 or ∆G>0 Exergonic or Endergonic

Photosynthesis ∆G < 0 or ∆G>0 Exergonic or Endergonic

Cellular Respiration (Glucose to ATP) ∆G < 0 or ∆G>0 Exergonic or Endergonic

ATP to ADP ∆G < 0 or ∆G>0 Exergonic or Endergonic

ADP to ATP ∆G < 0 or ∆G>0 Exergonic or Endergonic

Draw a free energy diagram for cellular respiration and a free energy diagram for photosynthesis in the space below: Cellular Respiration Photosynthesis