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chem105-exam3-thermochemistry (1)

chem105-exam3-thermochemistry (1) - Exam3Review...

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Exam 3 Review Thermochemistry

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Know your vocab: Phase Changes ¡ Fusion, melting, vaporization, sublimation etc. ¡ Warming curve—know how to draw one and  understand what it represents liquid
"Fusion" and "sublimation"  describe the changes in state  from a) solid to liquid & liquid to gas b) liquid to solid & liquid to solid c) solid to liquid & gas to liquid d) solid to liquid & solid to gas e) gas to liquid & solid to gas f) none of these is correct Answer: D

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More vocabulary… ¡ Heat Capacity  —of an  object ¡   e.g. If the heat capacity of my dog is 100 kJ/ºC and  his temperature rises by 2ºC, how much heat must he  have absorbed?   ¡ Specific Heat Capacity —of a  substance  (e.g. water)  “/g” or “/mol” ¡   e.g., If the specific heat (capacity) of Fe is ~0.5  J/gºC, how much will the temperature of a 10 g  sample of Fe rise if I add 100 J of heat?
The heat of vaporization of water is 540 cal/g.   Approximately how much heat passes from the  surroundings to the system when 0.1 mol of  water evaporates?   a) 1000 cal b) 540 cal c) 1800 cal d) 10 kcal Answer: A)

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If I decrease the heat capacity of the  liquid on a warming curve, what  happens to the slope of the curve?
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chem105-exam3-thermochemistry (1) - Exam3Review...

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