CHY122S08Lecture10 - Schedule • Today Thermo(Ch 19 •...

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Unformatted text preview: Schedule • Today- Thermo (Ch 19) • Next week (8 th and 10 th )- Thermo • April 15 th and 17 th – Echem (Ch 20) • April 22 nd- Exam IV (Thermo and Echem) • April 24 th (Thurs- Echem/start nuclear) • April 29 th and May 1 st – Nuclear (Ch 21) • Tuesday, May 6 th 8-10 AM- Final exam (comprehensive) Thermodynamics CHAPTER 19 Predicting whether reactions occur spontaneously Classic thermo reactions • Thermite • Nitrogen triiodide • Gummy Bear • Mentos/Diet Coke • Methanol cannon Laws of Thermodynamics • First law- • Energy is conserved. • Second law – The total entropy (disorder) of the universe is increasing. • Third law – At absolute 0, the entropy (disorder) is 0. Classify reactions • Spontaneous reactions occur without continuous outside intervention • Nonspontaneous reactions occur only with continuous outside intervention, such as a heat source Classify as spontaneous or non 1. A puddle of water evaporates on a summer day 2. Silicon dioxide (sand) decomposes to the elements silicon and oxygen 3. Paper, which is mainly cellulose (C 6 H 10 O 5 ) burns at a temperature of 451 F....
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CHY122S08Lecture10 - Schedule • Today Thermo(Ch 19 •...

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