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2019
AP®
ChemistrySample Student Responses and Scoring Commentary
© 2019 The College Board. College Board, Advanced Placement, AP, AP Central, and the acorn logo are registered trademarks of the College Board. Visit the College Board on the web: collegeboard.org.
AP Central is the official online home for the AP Program: apcentral.collegeboard.org.
Inside:
Free Response Question 3
R Scoring Guideline
R Student Samples
R Scoring Commentary
AP® CHEMISTRY
2019 SCORING GUIDELINES
© 2019 The College Board.
Visit the College Board on the web: collegeboard.org.
Question 3
AP® CHEMISTRY
2019 SCORING GUIDELINES
© 2019 The College Board.
Visit the College Board on the web: collegeboard.org.
Question 3 (continued)
33 3
2 33 2 3
3
1 mol CaCO0.93 g CaCO 0.0093 mol CaCO
100.1 g
1 mol Na CO0.0093 mol CaCO 0.0093 mol Na CO
1 mol CaCO
´ =
´ =
32
3
[HCO ][OH ]
[CO ]
- -
-
AP® CHEMISTRY
2019 SCORING GUIDELINES
© 2019 The College Board.
Visit the College Board on the web: collegeboard.org.
Question 3 (continued)
( )( )b
i
x xK
c x=
-
( )( )i
b
x xc x
K= +
© 2019 The College Board. Visit the College Board on the web: collegeboard.org.
© 2019 The College Board. Visit the College Board on the web: collegeboard.org.
© 2019 The College Board. Visit the College Board on the web: collegeboard.org.
© 2019 The College Board. Visit the College Board on the web: collegeboard.org.
© 2019 The College Board. Visit the College Board on the web: collegeboard.org.
© 2019 The College Board. Visit the College Board on the web: collegeboard.org.
© 2019 The College Board. Visit the College Board on the web: collegeboard.org.
© 2019 The College Board. Visit the College Board on the web: collegeboard.org.
© 2019 The College Board. Visit the College Board on the web: collegeboard.org.
AP® CHEMISTRY
2019 SCORING COMMENTARY
© 2019 The College Board.
Visit the College Board on the web: collegeboard.org.
Question 3
Note:
Overview
Sample: 3A
Score: 10
AP® CHEMISTRY
2019 SCORING COMMENTARY
© 2019 The College Board.
Visit the College Board on the web: collegeboard.org.
Question 3 (continued)
Sample: 3B
Score: 8
−
− −
Sample: 3C
Score: 6
− −