Chem 1021
Self-Evaluation Test ( Zumdahl, Chapters 1 – 4 )
Fall Semester
It is very important to have a good background in chemistry. The first four chapters of the text
cover much of this background or review material. In lecture it will be covered more quickly than
the material in later chapters. This self-evaluation test is designed to test your knowledge of the
material in chapters 1 – 4. You should take it today without studying the chapters. Answers are
given at the end of the test, but don’t look at them until you have answered all the questions. If you
score below 50%, it indicates that you must work extra hard during the first several weeks to refresh
your background. Please take this practice test seriously. It is very difficult to keep up in this course
if you are not adequately prepared for it.
For the following multiple choice questions, circle the letter (a-e) of the one choice that best answers
the question. For numerical problems your answer may differ slightly due to round-off errors.
Therefore a value that is ± 2 % of your answer should be selected as correct. There is no partial
credit, you do not have to show any work and you may use a periodic table.
1.
Given the following densities at 25°C.
magnesium: 1.7 g/cm3
graphite: 1.8 g/cm3
iron: 7.9 g/cm3
A block of iron has a mass of 826 g. What is the mass of a block of magnesium that has the same volume as the
block of iron?
a.
1.4 x 102 g.
b.
3.8 x 102 g.
c.
8.3 x 102 g.
d.
1.8 x 102 g.
e.
none of the above are within 10 g. of the right answer
2.
One mole of iron (Fe):
a.
is heavier than one mole of lead (Pb)
b.
is 77.0 g. of iron
c.
is 26.0 g. of iron
d.
weighs the same as one mole of lead
e.
none of the above
3.
Identify the reducing agent in the following equation.
Cd + NiO2 +2H 2 O
a. Cd b. NiO2
c. H2O
Cd(OH)2 + Ni(OH) 2
d. Cd(OH) 2
e. Ni(OH)2
4.
How many atoms are in 5.54 g. of F2 molecules?
a.
6.02 x 1023 atoms
b.
1.76 x 1023 atoms
c.
8.78 x 1022 atoms
d.
0.146 atoms
e.
0.292 atoms
5.
When aqueous solutions of Pb(NO 3)2 and NH4Cl are mixed, a solid precipitate of PbCl2 forms. Which
of the following is the correct net ionic equation for this precipitation reaction?
a.
b.
c.
d.
e.
Pb(NO 3)2(aq) + 2NH4Cl(aq) ∅ 2NH 4NO 3(aq) + PbCl 2(s)
Pb 2+ (aq) + 2Cl- (aq) + 2NO3 - (aq) + 2NH4 +(aq) ∅ 2NH 4 +(aq) + 2NO3 - (aq) + PbCl2 (s)
Pb2+ (aq) + 2Cl -(aq) ∅ PbCl2(s)
NH 4+ (aq) + NO3-(aq) ∅ NH 4NO 3(aq)
Pb2+ (aq) + 2NO3-(aq) + 2Cl -(aq) ∅ PbCl2(s) + 2NO3-(aq)
6.
Which is the chemical formula of the salt produced by neutralization of calcium hydroxide, Ca(OH)2, with
perchloric acid, HClO4?
a.
CaCl2
b.
CaClO3
c.
CaClO4
d.
Ca(ClO4)2
e.
Ca(ClO)2
7.
How many grams of carbon dioxide (CO2) are produced by the fermentation of 315 g. of glucose
(C6H12O6) according to the following reaction. Assume the reaction is 100% complete.
C6 H12 O6 ∅ 2C2 H5 OH + 2CO 2
a.
154 g.
b.
630 g.
c.
77.0 g.
d.
50.3 g.
e.
3.50 g.
8.
What is the maximum number of grams of ammonia, NH3(g), that can be obtained from 10.0 g. of H2(g)
and 80.0 g. of N2(g)? The balanced reaction is:
N2 (g) + 3H2 (g) ∅ 2NH3 (g)
a. 28.2 g.
9.
b. 48.7 g.
c. 56.3 g.
d. 97.3 g.
e. 127 g.
Exactly 29.6 mL of a hydrochloric acid (HCl) solution was required to neutralize 2.86 g. of Ca(OH)2(s).
What is the molarity of the HCl solution?
2HCl(aq) + Ca(OH)2 (s) ∅ CaCl2 (aq) + 2H2 O(l)
(given: Mol wt. of HCl is 36.46 g/mol,
a.
b.
c.
d.
e.
10.
2.28 x 10-10 M
7.7 x 10-2 M
1.30 M
1.50 M
2.60 M
Which of the following compounds give aqueous solutions that do not contain a large concentration of
ions (i.e., will not conduct electricity)?
a.
b.
c.
d.
e.
11.
Mol. wt. of Ca(OH)2 is 74.10 g/mol)
sodium chloride, NaCl
ethyl alcohol, C2H5OH
ammonia, NH3
sulfuric acid, H2SO 4
none of the above, they all contain contain ions and conduct
Which of the following reactions is a REDOX reaction?
a.
b.
c.
d.
e.
HCl(aq) + NaOH(aq) ∅ H2O(aq) + NaCl(aq)
60C(g) ∅ C60(s) (C60 is the Buckminsterfullerene molecule)
H2O(l) ∅ H2O(g)
3H2(g) + N2(g) ∅ 2NH 3(g)
Ba(NO3)2(aq) + K2CrO4(aq) ∅ BaCrO4(s) + 2KNO3(aq)
12.
The fictional element kryptonite (given the symbol Ky) associated with Superman's home planet of
Krypton could be said to consist of two isotopes with the following natural abundances and mass
numbers. Estimate the approximate atomic mass of Ky.
285Ky, 70.0%
289Ky, 30.0%
a. 285 amu
b. 286 amu
c. 287 amu
d. 288 amu
e. 574 amu
13.
A student heated a piece of titanium metal (Ti) in the presence of sulfur (S), and found that 3.70 g. of the
metal combined with enough sulfur to make 8.65 g. of a pure "titanium sulfide" compound. What is the
empirical or simplest formula of the compound?
a. TiS3
b. TiS
c. Ti2S
d. TiS2
e. none of these
14.
Which one of the following numbers contains six significant figures?
a.
0.003702
b.
1.003702
c.
4.2010
d.
1000.00
e.
66666.
15.
Calculate the molarity of NiSO4 in a solution prepared by dissolving 10.0 g. of nickel sulfate hexahydrate,
NiSO 4•6H2O (formula weight = 262.8), in enough water to make 450 mL of solution?
a.
1.44 x 10-1 M
b.
1.44 x 10-4 M
c.
3.81 x 10-2 M
d.
8.46 x 10-5 M
e.
8.46 x 10-2 M
16.
What volume of 0.152 M KMnO4 solution would completely react with 20.0 mL of 0.381 M FeSO4
solution according to the following net ionic equation?
5Fe2 + + 8H + + MnO 4 a.
b.
c.
d.
e.
17.
5Fe3 + + Mn2 + + 4H 2 O
4.00 mL
10.0 mL
50.0 mL
125 mL
250 mL
How many electrons, protons, and neutrons are in the following ion:
3-
77
X
35
a.
b.
c.
d.
e.
18.
38 electrons, 35 protons, 42 neutrons
77 electrons, 32 protons, 77 neutrons
32 electrons, 80 protons, 35 neutrons
32 electrons, 77 protons, 35 neutrons
35 electrons, 35 protons, 42 neutrons
Determine the true molecular formula of a compound that contains 40.0% carbon, 6.71% hydorgen, and
53.29% oxygen and has a molecular mass of 60.05.
a.
C2H4O3
b.
CH2O
c.
CH2O2
d.
C2H2O4
e.
none of the above
19.
What is the coefficient preceding O2 when the following combustion reaction of one mole of the fatty acid,
C18H36O2, is properly balanced?
_C18 H36 O2 (s) + _O 2 (g)
a.
b.
c.
d.
e.
_CO2 (g) + _H 2 O(l)
1
8
9
26
27
20.
How many mL of 6.0 M H2SO 4 would be required to make 250 mL of 0.10 M H2SO 4?
a.
0.24 mL
b.
4.2 mL
c.
16 mL
d.
2.4 x 102 mL
e.
24 mL
21.
What is the most likely formula for a compound made from the combination of the elements Ca and Cl?
a.
CaCl
b.
CaCl2
c.
Ca2Cl
d.
CaCl3
e.
Ca2Cl2
22.
Which one of the following elements should be most similar to strontium, Sr, in chemical and physical
properties?
a. Li
b. At
c. Rb
d. Ba
e. Cs
For this test to be beneficial to you, don't look at the answers until you honestly take the test.
Answers
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
D
E
A
B
C
D
A
C
E
B
D
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
B
D
D
E
B
A
E
D
B
B
D