Chemistry Review

Front 1

What is the formula for Gibbs Free Energy, and what does it tell you?

Back 1

∆G = ∆H - T∆S
Determines spontenaity of a reaction, but does not say anything about the SPEED of the reaction

Front 2

What do negative and positive ∆Gs mean?
Zero?

Back 2

Positive ∆G = Moves Towards reactants

Negative ∆G = spontaneous (forward, towards products)
IF ∆G = 0, equilibrium and DEATH :o

Front 3

What is the definition of Enthalpy (∆H)? What do + and - values mean?

Back 3

[The energy required to break bonds in REACTANTS] - [energy released from bonds formed in PRODUCTS]

(+) = energy is added to the system (ENDOthermic)

(-) energy is released (EXOthermic)

Front 4

Define Entropy (∆S)?

Back 4

Entropy is the change in disorder of a system (Disorder of products - disorder of reactants)

Tends towards increase

Front 5

What is the generic formula for ∆G NOT at equilibrium?
At equilibrium?

Back 5

∆G = ∆G˚ + RTlnK_eq
0 = ∆G˚ + RTlnK

or ∆G˚=RTlnK

Front 6

What are the relationships between K_eq and [P]/[R]

Back 6

If P/R is > K_eq....Reaction goes reverse (towards reactants

If P/R < K_eq...Reaction goes forwards (towards products)

If P/R = Keq --> equilibrium, and DEATH :O