Enthalpy, Entropy, and Gibb’s Free Energy

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Presentation transcript:

Enthalpy, Entropy, and Gibb’s Free Energy Accompanies the Lab on p574 Enthalpy, Entropy, and Gibb’s Free Energy

Calculating the “change” in…. = CHANGE = Final – Initial ie….. The change in temperature when water is heated from 28 degrees Celsius to 104 degrees Celsius is…. T = 104 – 28 = 76 degrees Celsius

Change in Enthalpy ( H) Measure of energy in a system Melting = (-) Freezing = Bomb = Endothermic = positive H Exothermic = negative H 100 ice 50 (+) liquid (-) 20 Time

Change in Entropy ( S) Measure of randomness in a system S = lots – little = (+) Melting = (+) Freezing = Bomb = (-) (+) Organized- little randomness Unorganized- lots randomness

Gibbs Free Energy ( G) Temperature Dependent (T) G = H – T S Measures if a reaction will happen on its own (spontaneous) or if it will need help (fire, catalyst, etc…) G = (-) = spontaneous , ex: melting G = (+) = nonspontaneous, ex: freezing

Homework: READ p541-559 Questions p555 #6 P559 #11-13, 15