AP chemistry scoring guidelines from the 2019 exam administration

AP Chemistry Scoring Guidelines from the 2019 Exam Administration AP ® Chemistry Scoring Guidelines 2019 © 2019 The College Board College Board, Advanced Placement, AP, AP Central, and the acorn logo[.]

Chemistry

Scoring Guidelines

Question 1





Question 1 (continued)



 1 mol

60.06 g



 0.0897 mol = 17.9

Question 1 (continued)

soln S



2 2 2 2

2 2

2 2

(H NCONH ( )) (H NCONH ( ))

70.1 J/(mol K) (H NCONH ( )) 104.6 J/(mol K)

(H NCONH ( )) 174.7 J/(mol K)

soln

soln S

D

soln

S



 



Question 2









Question 2 (continued)

 H 

1 1

(0.100 mol)(0.08206 L atm mol K )(298 K)

2.00 L

nRT

V

-

-=

2 2

2

[Br ][Cl ]

[BrCl]

eq

K = Br 2 Cl 2

2 BrCl

eq

P P K

P







2

(0.26)(0.26)

0.13 (0.71)

eq

K = =

Question 2 (continued)

 







Question 3



Question 3 (continued)

3

2 3

3

1 mol CaCO

100.1 g

1 mol Na CO

1 mol CaCO



2 3

[HCO ][OH ]

-

 

Question 3 (continued)















( )( )

b

i

x x

K

c x

b

x x

K











Question 4

1 2

1 = 2

P P

P

Question 5

18

0.980 ´ 10- J

hc

E hn

l

E

l =

18

(6.626 10 Js)(2.998 10 ms )

l

=

´

7

2.03 10 m

-Question 6



2

1 [NO ]

Question 6 (continued)







2 4 2 2

[N O ] [NO ]

eq

K 

Question 7



Question 7 (continued)

