Thermodynamics II

17 important questions on Thermodynamics II

What is Gibbs free energy?

The thermodynamic potential of maximum non-expansion work

What does Gibbs free energy describe?

The tendency of reactions to be spontaneous or non-spontaneous

What is an exergonic reaction?

A chemical reaction where the change in the free energy is negative, also called a spontaneous reaction
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What is an endergonic reaction?

A chemical reaction in which the standard change in free energy is positive, and an additional driving force is needed, also called a non-sponaneous reaction

What does it mean when ∆G is negative?

Then it is a spontaneous/exergonic reaction

What does it mean when ∆G is positive?

Then it is a non-spontaneous/endergonic reaction

What does it mean when ∆G is zero?

The reaction is at equilibrium

What is the reaction of glucose being aerobically oxidized?

Glucose + 6 oxygen --> 6 carbon dioxide + 6 water

How can ∆G be calculated from∆G0?

By adjusting it for the concentrations of products and reactants

What does it mean if Q is smaller than Keq?

The reaction proceeds forwards (toward product)

What does it mean if Q is bigger than Keq?

The reaction proceeds backwards/reverse (toward reactant)

What are redox reactions?

The primary way for most chemotrophs to conserve energy

What happens in redox reaction?

Electrons move from an electron donor to an electron acceptor

Of what two half reactions does each redox reaction consist?

One reaction that donates e- and the other accepts e-

What is the Nernst equation?

A calculation for the electrochemical cell potential at any known pressure, temperature, and concentration

What is the redox tower?

It gives information regarding standard reduction potentials for various redox couples

What does the biological reduction potential (E0`) show?

What redox couples microorganisms can use to conserve energy

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