Chem_208_Lecture_2_BW

Chem_208_Lecture_2_BW - Continue Reading 7.4-7.6 Next Week...

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1 Continue Reading 7.4-7.6 Next Week: Finish reading through 7.8 (7.9 Optional)
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2 Exothermic vs. Endothermic Reactions Exothermic (exo = out) In a non isolated system, releases heat to surroundings. Produces a temperature increase in an isolated system Heat transferred from system to surroundings: q sys < 0 Heat of reaction q < 0 Endothermic (endo = in) In a non isolated system, absorbs heat from surroundings Produces a temperature decrease in an isolated system Heat transferred from surroundings to system: q sys > 0 Heat of reaction q > 0 System heat Surroundings System heat Surroundings
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3 Exothermic (exo = out) In a non isolated system, releases heat to surroundings. Produces a temperature increase in an isolated system Heat transferred from system to surroundings: q sys < 0 System heat Surroundings Combustion of Methane: CH 4 (g) + 2O 2 (g) 2H 2 O (g)+ CO 2 (g) q - 800 kJ *Chemists focus on the system .
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4 Mix barium hydroxide octahydrate with ammonium thiocyanate: Ba(OH) 2 .8H 2
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