AP Chemistry Scoring Guidelines from the 2018 Administration
2018
AP Chemistry
Scoring Guidelines
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AP? CHEMISTRY 2018 SCORING GUIDELINES
Question 1
DH rxn
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AP? CHEMISTRY 2018 SCORING GUIDELINES
Question 1 (continued)
DH rxn
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AP? CHEMISTRY 2018 SCORING GUIDELINES
Question 1 (continued)
DH rxn
DH rxn mol
DH rxn
By doubling the volumes, the number of moles of the reactants are doubled, which doubles the amount of energy produced.
OR
In the second experiment, D
2 mcT mcT D .
2n
n
Thus the magnitude is the same as calculated in the first experiment
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AP? CHEMISTRY 2018 SCORING GUIDELINES
Question 2
()
DH298
DS298
DG298
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AP? CHEMISTRY 2018 SCORING GUIDELINES
Question 2 (continued)
K = e-DG / RT
K =
-
e
870 J/mol (8.314 J mol-1 K-1)(298 K)
K = 0.70
PNO
PNO 2
PN2O3
PN2O3
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AP? CHEMISTRY 2018 SCORING GUIDELINES
Question 2 (continued)
1 point is earned for a valid diagram. 1 point is earned for the correct answer.
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AP? CHEMISTRY 2018 SCORING GUIDELINES
Question 2 (continued)
0.100 1000
mol KOH mL KOH
0.0020 mol HNO2 0.100 L
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