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This quiz contains 9 questions from a mix of 1 subtopics.
The greater the entropy, the the disorder.
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What are the standard units of entropy?
J K-1 mol-1
kJ mol-1
J mol-1
kJ K-1 mol-1
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Which state of matter generally has the greatest entropy?
solid
liquid
gas
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Which of the following is an example of a process that increases entropy?
freezing of water
evaporation of water
melting of ice
condensation of a gas
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What is the standard entropy?
the entropy of a substance in its most stable state
the entropy of a substance in a chemical reaction
the entropy of a substance at room temperature
the entropy of a substance under standard conditions
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Predict the value of ΔS⦵ for the following reaction:
N2(g) + 3H2(g) ➔ 2NH3(g)
ΔS⦵ = 0
ΔS⦵ < 0
ΔS⦵ > 0
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Which of the following reactions would result in an increase in entropy?
(Select all that apply).
2H2(g) + O2(g) ➔ 2H2O(g)
2H2O(g) ➔ 2H2(g) + O2(g)
2H2O(l) ➔ 2H2O(g)
2H2O(g) ➔ 2H2O(l)
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Calculate the entropy change of the following reaction using the standard entropies provided.
2NO(g) + O2(g) ➔ 2NO2(g)
The standard entropies are:
- ΔS⦵(NO(g)) = +211 J K-1 mol-1
- ΔS⦵(O2(g)) = +205 J K-1 mol-1
- ΔS⦵(NO2(g)) = +240 J K-1 mol-1
J K-1 mol-1
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What is the entropy change of the following reaction above using the standard entropies provided?
CaCO3(s) ➔ CaO(s) + CO2(g)
The standard entropies are:
- ΔS⦵(CaCO3(s)) = 93 J K-1 mol-1
- ΔS⦵(CaO(s)) = 40 J K-1 mol-1
- ΔS⦵(CO2(g)) = 214 J K-1 mol-1
-161 J K-1 mol-1
+161 J K-1 mol-1
-81 J K-1 mol-1
+81 J K-1 mol-1
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