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Is the system’s entropy change positive or negative?
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• Water vapor deposits as ice crystals on a cold windowpane
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• A can of carbonated beverage loses its fizz (Consider the beverage but not the can as the system.)
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• A glassblower heats glass to its softening temperature
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• Water boils
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• A teaspoon of sugar dissolves in a cup of coffee. (The system consists of both sugar and coffee.)
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• Calcium carbonate precipitates out of water in a cave to form stalactites and stalagmites. (Consider only the calcium carbonate to be the system.)
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Which one has a higher entropy?1 or 2
Be able to explain why
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• Solid carbon dioxide at -78C
• Carbon dioxide vapor at 0C
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• Solid sugar • Sugar dissolved in tea
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• 100mL of water and 100mL of alcohol
• 100mL of water and 100mL of alcohol mixed together
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• Cl2 (g) • P4 (g)
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• NH4NO3(s) • NH4NO3(aq)
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• AsH3(g) • Kr(g)
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• CH3OH(l) • C2H5OH(l)
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Predict whether the entropy change would be positive or negative
Be able to explain why
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• C2H4(g) + H2(g) C2H6(g)
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• CH3OH(l) CO(g) + 2H2(g)
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• Ag+(aq) + I-(aq) AgI(s)
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• Br2(l) + H2(g) 2HBr(g)
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• CaCO3(s) CaO(s) + CO2(g)