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CHEM 1212: Spring Term 2005
Practice Final (CHM 1046 Fall 1997's Test)
Module Eleven and Twelve (Chapters 17 & 18 )

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Module Eleven and Twelve

Module Eleven & Twelve Test Masters:

Mary Alcott (maliceall@juno.com)

Juliana Allebach (Ruuufie@aol.com)

John Taylor (jtaylor@hcc.cc.fl.us) [Consultant]


Multiple Choice [One Answer Only]

Question 1

Given the ionization, which of the following is a weak Arrhenius base?

a) NH4OH(aq) (~1% ionized)
b) LiOH(aq) (~100% ionized)
c) CsOH(aq) (~100% ionized)
d) Sr(OH)2(aq) (~100% ionized)
e) Ba(OH)2(aq) (~100% ionized)

Question 2

In the following reversible reaction, which of the reactants is acting as a Bransted - Lowry base?
HCl(aq) + KHS(aq) <---> KCl(aq) + H2S(aq)
a) HCl
b) KHS
c) KCl
d) H2S
e) H2O

Question 3

In the following reversible reaction, which of the two substances are acting as a Bransted - Lowry acids?
KC2H3O2(aq) + HCN(aq) <---> HC2H3O2(aq) + KCN(aq)

a) KC2H3O2 and HC2H3O2
b) KC2H3O2 and KCN
c) HCN and HC2H3O2
d) HCN and KCN
e) HC2H3O2 and KCN

Question 4

Which of the following reversible reactions represents the ionization of water?

a) H2O + H2O <--> 2H2 + O2
b) H2O + H2O <--> H3O+ + OH-
c) H2O + H+ <--> H3O+
d) H2O + OH <--> H3O+ + OH-
e) H2O + H3O+ <--> H3O+ + H2O

Question 5

Given an aqueous solution in which the [H+ ] = 5.0 x 10-3,what is the molar hydroxide ion concentration?
a) [OH-] = 2.0 x 10-10
b) [OH-] = 2.0 x 10-11
c) [OH-] = 2.0 x 10-12
d) [OH-] = 5.0 x 10-11
e) [OH-] = 5.0 x 10-12

Question 6

Which of the following is true if the hydroxide ion concentration of an aqueous solution increases?
a) the Kw increases
b) the pH decreases
c) the hydrogen ion concentration increases
d) the hydrogen ion concentration decreases
e) none of the above

Question 7

What is the molar hydrogen ion concentration of stomach acid that registers a pH of 2 on a strip of pH paper?

a) 0.2 M
b) 0.01 M
c) 0.2 M
d) 0.1 M
e) 2 M

Question 8

Which of the following aqueous solutions are slightly ionized?

a) weak acids
b) weak bases
c) very slightly soluble salts
d) all of the above
e) none of the above

Question 9

A hydronium ion is a hydrogen ion bonded to which of the following?

a) hydrogen atom
b) hydroxide ion
c) hydrogen molecule
d) water molecule
e) none of the above

Question 10

Which of the following terms expresses the [OH-] on an exponential scale?
a) pH or pOH
b) pH or -log [H+]
c) pH or -log [OH-]
d) pOH or -log [H+]
e) pOH or -log [OH-]

Question 11

What is the molar hydrogen ion concentration of an aqueous acid solution having a pH of zero?

a) 0 M
b) 0.1 M
c) 1 M
d) 10 M

Question 12

What is the equilibrium constant expression, Ki, for the following weak acid?
H2CO3(aq) <--> H+(aq) + HCO3(aq)
a) Ki = [H+] [HCO-3] / [H2CO3]
b) Ki = [H+]² [HCO-3] / [H2CO3]
c) Ki = [H+]² [CO2-3] / [H2CO3]
d) Ki = [H2CO3] / [H+] [HCO3]
e) Ki = [H2CO3] / [H+] [CO32-]

Question 13

If the hydroxide ion concentration of a 0.109 M NH4OH solution is 0.0014 M, what is the ionization constant for ammonium hydroxide?
a) Ki = 1.3 x 10-2
b) Ki = 1.4 x 10-3
c) Ki = 1.8 x 10-4
d) Ki = 1.8 x 10-5
e) Ki = 1.8 x 10-6

Question 14

Which of the changes listed below will shift the equilibrium to the left for the following reversible reaction in aqueous solution?
HNO2(aq) <--> H+(aq) + NO-2(aq)
a) increase [ HNO2 ]
b) increase pH
c) add solid KNO2
d) add solid KCl
e) add solid KOH

Question 15

What is the equilibrium constant expression, Ksp, for slightly soluble copper (II) phosphate in aqueous solution?
Cu3(PO4)2(s) <--> 3 Cu2+(aq) + 2PO43-(aq)
a) Ksp = [Cu2+] [PO43-]
b) Ksp = [Cu2+]³ [PO43-]
c) Ksp = [Cu2+] [PO43-]²
d) Ksp = [Cu2+]³ [PO43-]²
e) Ksp = [Cu2+]² [PO43-]³

Question 16

Which of the changes listed below will shift the equilibrium to the right for the following reversible reaction?
SrCO3(s) <--> Sr²+(aq) + CO3²-(aq)
a) increases [ Sr2+]
b) increases [ CO32-]
c) add solid SrCO3
d) add solid Sr (NO3)2
e) none of the above

Question 17

What is the symbol for the molar concentration of a chemical species A?

a) [ A ]
b) Eact
c) H
d) Ka
e) none of the above

Question 18

What is the term for the statement that a change in concentration, temperature, or pressure will cause an equilibrium shift to relieve the stress?

a) concentration equilibrium constant expression
b) law of chemical equilibrium
c) law of mass action
d) LeChatelier's principle
e) mass law expression

Question 19

If the pH of a 0.333 M HClO solution is 4.0, what is the ionization constant for hypochlorous acid?

a) Ki = 3.0 x 10-4
b) Ki = 3.0 x 10-5
c) Ki = 3.0 x 10-8
d) Ki = 3.0 x 10-9
e) Ki = 3.0 x 10-10

Question 20

What is the Ksp for magnesium hydroxide, Mg(OH)2, if the hydroxide ion concentration in a saturated solution is 0.00016 M?

a) Ksp = 1.3 x 10-8
b) Ksp = 2.6 x 10-8
c) Ksp = 2.0 x 10-12
d) Ksp = 4.1 x 10-12
e) Ksp = 8.2 x 10-12



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