5 Steps to a 5 AP Chemistry 2019

AP Chemistry Practice Exam 1 ❮ 319

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49. 
    

    A chemist has a 500 mL beaker with a small
    amount of mercury(II) oxide, HgO, on the
    bottom. Mercury(II) is insoluble in water but will
    dissolve in strong acid. She adds 250 mL of water
    and begins adding 1.0 M hydrochloric acid. She
    continues adding acid until the solid just dissolves.
    She then tests the solution and finds that it is non-
    conducting. Which of the following best represents
    the result for the solution just as the last of the solid
    dissolves?
    (A)

    
    

• 
  


• 
  


• 
  


• –

+

+

+

+

+

HgCl 2 (aq)

H 2 O(1)

H+(aq)

Hg2+(aq)

Cl–(aq)

(B)

+

+

HgCl 2 (aq)

H 2 O(1)

H+(aq)

Hg2+(aq)

Cl–(aq)

(C)

• –


• 
  


• 
  


• 
  


• –

+

+

+

+

+

+

+

HgCl 2 (aq)

H 2 O(1)

H+(aq)

Hg2+(aq)

Cl–(aq)

(D)

+ + +

+

+

+

HgCl 2 (aq)

H 2 O(1)

H+(aq)

Hg2+(aq)

Cl–(aq)

50. A dilute aqueous solution of potassium
    bromide, KBr, is heated to the boiling
    point. Which of the following best repre-
    sents this system?
    (A)

+–

+– –

+

O

H

K

Br

(B)

+

+

+–

+

O

H

K

Br

(C) +

+

+

+

O

H

K

Br

(D)

+

+ –

• –

+

O

H

K

Br

20-Moore_PE01_p307-340.indd 319 31/05/18 1:58 pm