Exam 4 Review

# Exam 4 Review - Exam#4 will cover Spontaneity and...

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Unformatted text preview: Exam #4 will cover: Spontaneity and entropy (Ch. 8, except 8.4, and 9.3 and 9.7):- Boltzmann formula- entropy, disorder, and probability (see example in notes) - entropy and heat and under different conditions (T,P,V)- Gibbs free energy at standard and non-standard conditions- T, p, conc. dependence of Δ G- the Gibbs free energy and equilibrium Not needed: Carnot cycles and engines Electrochemistry (Ch. 12)- cell potential and the Gibbs free energy- Nernst Equation - concentration effects- equilibrium constant and cell potential- electrolysis (Al production, electrolysis in water, electroplating)- batteries (rechargeable), fuel cells (water, methanol)- 12.7: only qualitative understanding Not needed: Microbial fuel cells and nanoelectrodes Transition metals and coordination compounds (Ch. 18) Formulas, ionic charges, and naming (18.1, 18.2) ∑ ∑ − = Δ react o prd o rxn S S S ∑ ∑ − = Δ ) ( ) ( react H prd H H f o f o rxn > Δ − Δ = Δ + Δ = Δ sur rxn rxn sur sys T H S S S S yes if | Δ S sys |<| Δ S sur | (low T) ? + (exo)- yes if | Δ S sys |>| Δ S sur | (high T) ?- (endo) + no-- (endo)- yes + + (exo) + Spontaneous? Δ S univ Δ S sur Δ S sys Spontaneity and chemical rxns (T=298 o C, P=1atm) Example: Phase transitions at T=const Calculate Δ S sys for 1 mole of ice melting at room temperature T H T Q S ft r Δ = Δ = Δ 1 1 1 . 22 273 012 , 6 − − − ⋅ ⋅ = ⋅ = Δ = Δ K mol J K mol J T H S ft m 2. Short answer (8 points).2....
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Exam 4 Review - Exam#4 will cover Spontaneity and...

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