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WARM UP: Any questions on test review?

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Presentation on theme: "WARM UP: Any questions on test review?"— Presentation transcript:

1 WARM UP: Any questions on test review?
TODAY: Entropy Discussion Topics on Test Additional Time to work on Review Homework: None Test 4/12

2 Video Notes 2nd Law of Thermodynamics: Any spontaneous process increases the disorder of the universe Spontaneous: Not requiring an outside source of energy to proceed Gibbs Free Energy: The amount of energy in a system that is available to do useful work Formula: ΔG = ΔH – TΔS ΔH>TΔS = enthalpy-driven ΔH<TΔS = entropy-driven Enthalpy driven = flow of thermal energy provides most of the free energy for the reaction Entropy driven = increasing disorder provides most the free energy

3 Video Notes ΔG State of Reaction - Spontaneous + NonSpontaneous
Equilibrium

4 Entropy (∆S) Entropy is a measure of randomness or disorder.

5 System is getting more ORDERED, so entropy decreases
Entropy in Chemistry In the following equation, is entropy increasing or decreasing? 2 H2 (g) + O2 (g) 2 H2O (l) 3 moles of GAS 2 moles of LIQUID System is getting more ORDERED, so entropy decreases

6 Entropy In any spontaneous change, the entropy of the world increases
ΔStotal = ΔSsystem + ΔSsurroundings  Gibbs Free Energy combines entropy, enthalpy and temperature to determine the spontaneity of a reaction.

7 Gibbs Free Energy Formula: ΔG = ΔH – T ΔS Used to determine in conditions are “favorable” for a reaction to occur spontaneously. *You will NOT be expected to do calculations with this

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