AP Chemistry Samples and Commentary from the 2019 Exam ... · Free Response Question 3 R Scoring Guideline R Student Samples R Scoring Commentary . Title: AP Chemistry Samples and

2019

AP®

ChemistrySample Student Responses and Scoring Commentary

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Inside:

Free Response Question 3

R Scoring Guideline

R Student Samples

R Scoring Commentary

AP® CHEMISTRY

2019 SCORING GUIDELINES

© 2019 The College Board.

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Question 3

AP® CHEMISTRY




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





( )( )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.









AP® CHEMISTRY

2019 SCORING COMMENTARY



Question 3

Note:

Overview

Sample: 3A

Score: 10

AP® CHEMISTRY

2019 SCORING COMMENTARY




Sample: 3B

Score: 8

−

− −

Sample: 3C

Score: 6

− −

Documents

AP Chemistry Samples and Commentary from the 2019 Exam ... · Free Response Question 3 R Scoring Guideline R Student Samples R Scoring Commentary . Title: AP Chemistry Samples and