Which of the following substances would be considered a nonelectrolyte

1
Which of the following substances would be
considered a nonelectrolyte?

• Methanol, CH3OH
• Hydrofluoric acid, HF
• Sulfuric acid, H2SO4
• Sodium hydroxide, NaOH

2
Correct Answer

• Methanol, CH3OH
• Hydrofluoric acid, HF
• Sulfuric acid, H2SO4
• Sodium hydroxide, NaOH

Methanol is an organic molecule that does not
form ions in solution.
3
Which ions are spectator ions in the reaction
represented by the following molecular equation?
AgNO3(aq) NaCl(aq) ? AgCl(s) NaNO3(aq)

• Na and NO3?
• Na and Cl?
• Ag and Cl?
• Ag and NO3?

4
Correct Answer

• Na and NO3?
• Na and Cl?
• Ag and Cl?
• Ag and NO3?

Spectator ions are present, but play no direct
role in the reaction.
5
Which of the following is not an
oxidation-reduction reaction?

• CH4(g) 2 O2(g) ? CO2(g) 2 H2O(g)
• HCl(aq) Zn(s) ? ZnCl2(aq) H2(g)
• Ca(OH)2(aq) 2 HCl(aq) ? CaCl2(aq) 2 H2O(l)
• Fe2O3(s) 3 H2(g) ? 2 Fe(s) 3 H2O(l)

6
Correct Answer

• CH4(g) 2 O2(g) ? CO2(g) 2 H2O(g)
• HCl(aq) Zn(s) ? ZnCl2(aq) H2(g)
• Ca(OH)2(aq) 2 HCl(aq) ? CaCl2(aq) 2 H2O(l)
• Fe2O3(s) 3 H2(g) ? 2 Fe(s) 3 H2O(l)

This is an acid-base reaction, and no species
change oxidation state.
7
What is the oxidation state of sulfur in the
compound SF2?

• 0
• 2
• 4
• ?2
• ?4

8
Correct Answer

• 0
• 2
• 4
• ?2
• ?4

Because F is ?1, and there are two F atoms, S
must be 2.
9
What is the oxidation state of nitrogen in the
compound N2O5?

• 0
• 1
• 2
• 5
• ?3

10
Correct Answer

• 0
• 1
• 2
• 5
• ?3

Because O is ?2, and there are five O atoms, each
of the two N atoms must be 5.
11
Which of the following compounds contains a
chlorine atom with an oxidation number of 5?

• ClF5
• KClO4
• HCl
• Cl2

12
Correct Answer

• ClF5
• KClO4
• HCl
• Cl2

Because F is ?1, and there are five F atoms, the
Cl atom must be 5. Structure of ClF5 is to the
left.
13
A 80.0 mL solution of sodium chloride at 1.00 M
is to be diluted to 0.100 M. What is the total
volume of the diluted solution?

• 0.0720 L
• 0.720 L
• 0.0800 L
• 0.800 L

MdiluteVdilute moles MconcVconc
14
Correct Answer

• 0.0720 L
• 0.720 L
• 0.0800 L
• 0.800 L

0.100 M(Vdilute) (1.00 M)(80.0 mL) Vdilute
(1.00 M)(80.0 mL)/0.100 M Vdilute 800. mL, or
0.800 L
15
How many moles of phosphoric acid, H3PO4, are
needed to prepare 2.00 L of a 0.75 M phosphoric
acid solution?

• 4.0 moles
• 1.5 moles
• 1.8 moles
• 0.75 moles

16
Correct Answer

• 4.0 moles
• 1.5 moles
• 1.8 moles
• 0.75 moles

(0.75 M) moles H3PO4/2.00 L moles H3PO4 (0.75
M)(2.00 L) 1.5 moles
17
A 50.0 mL solution of HCl at 1.00 M is to be
titrated with a solution of 2.50 M NaOH. How
many mL of NaOH are required to reach the
equivalence point?

• 20.0 mL
• 125 mL
• 50.0 mL
• 70.0 mL

18
Correct Answer

• 20.0 mL
• 125 mL

• 50.0 mL
• 70.0 mL

(50.0 mL HCl)(1.00 M) 0.0500 mol acid 0.0500
mol acid(1 mol base/1 mol acid) 0.0500 mol
base Vbase mol/M 0.0500 mol/2.50M 0.0200
L or 20.0 mL
19
A 50.0 mL solution of H2SO4 at 1.00 M is to be
titrated with a solution of 0.500 M NaOH. How
many mL of NaOH are required to reach the
equivalence point?

• 100. mL
• 200. mL
• 300. mL
• 50.0 mL

20
Correct Answer

• 100. mL
• 200. mL
• 300. mL
• 50.0 mL

(50.0 mL H2SO4)(1.00 M) 0.0500 mol acid 0.0500
mol acid(2 mol base/1 mol acid) 0.100 mol
base Vbase mol/M 0.100 mol/0.500M 0.200 L
or 200. mL