Name _________________
CHEM 1004
Final Exam
Spring 2011 (Buckley)
Multiple choice (2 points each). Circle the letter corresponding to the best answer to each question. You
may omit two of the multiple choice questions. To omit a question, write “OMIT” in big letters across
the problem to be omitted.
1. Which of the following is an example of a physical change?
a.
b.
c.
d.
Water is decomposed by electricity into hydrogen and oxygen.
A red substance is decomposed by heat to form mercury and oxygen.
Ice melts at 0 ºC.
Gasoline is burned to form hydrogen and oxygen.
2. Which of the following is a chemical property?
a.
b.
c.
d.
Sodium reacts with water to form sodium hydroxide.
Sugar is a solid at room temperature.
Salt dissolves in water.
Oil and water do not mix.
3. Vinegar is composed of approximately 5% acetic acid and 95% water. Which one of the
following is the best classification of vinegar?
a.
b.
c.
d.
pure substance
homogeneous mixture
heterogeneous mixture
compound
4. Refined white table sugar is usually derived from either sugar cane or sugar beets. Regardless of
the source of the table sugar, after refining it always has the same composition of carbon,
hydrogen and oxygen. Sugar is best classified as which one of the following?
a.
b.
c.
d.
mixture
element
compound
pure substance
5. The fact that sugar (problem 5) always has the same composition of carbon, hydrogen, and
oxygen is an example of which law?
a.
b.
c.
d.
Law of conservation of mass
Law of definite proportions
Law of multiple proportions
Law of conservation of energy
Page 1 of 10
6. In the SI system of measurement, the unit of length is the
a.
b.
c.
d.
kilogram
meter
yard
liter
7. How many cm are in 12.5 m?
a.
b.
c.
d.
0.125 cm
0.0125 cm
1250 cm
12500 cm
8. The prefix milli- means
a.
b.
c.
d.
1000 ×
100 ×
0.001 ×
0.01 ×
9. How many cg are in 0.895 mg?
a.
b.
c.
d.
895 cg
0.0895 cg
8.95 cg
89.5 cg
10. How many mL are in 750 cm3?
a.
b.
c.
d.
750 mL
75 mL
7500 mL
0.750 mL
11. The density of lead is 11.3 g/cm3. What mass of lead is required to make a 1 cm3 fishing sinker?
a.
b.
c.
d.
1.00 g
1.13 g
11.3 g
113 g
Page 2 of 10
12. The symbol
a.
b.
c.
d.
37
17
X represents an atom that contains:
37 protons, 17 neutrons, and 37 electrons
17 protons, 37 neutrons, and 17 electrons
17 protons, 20 neutrons, and 17 electrons
20 protons, 17 neutrons, and 20 electrons
13. The element represented by X in problem 13 is:
a.
b.
c.
d.
rubidium
chlorine
calcium
xenon
14. The phosphorous atom represented by
a.
b.
c.
d.
31
15
P3 contains:
15 protons, 16 neutrons, and 18 electrons
15 protons, 16 neutrons, and 12 electrons
16 protons, 15 neutrons, and 19 electrons
16 protons, 15 neutrons, and 13 electrons
15. An example of an alkaline-earth metal is:
a.
b.
c.
d.
Cs
Cu
Pb
Mg
16. An example of a halogen is:
a.
b.
c.
d.
O
C
Br
Kr
17. The formula for the phosphate ion is:
a. PO32-
b. PO43-
c. PO42-
d. PO33-
18. The formula for the compound formed between Ba and S is:
a. BaS
b. Ba2S
c. BaS2
d. Ba2S2
19. The formula for the compound formed between the ammonium ion and P is:
a. NH4P
b. NH4P3
c. (NH4)3P
d. (NH3)3P
Page 3 of 10
20. The name of the compound Na2O is:
a.
b.
c.
d.
sodium oxide
disodium oxide
sodium (I) oxide
sodium hydroxide
21. The name for the compound N2O5 is:
a.
b.
c.
d.
e.
nitrogen oxide
dinitrogen pentoxide
nitrogen pentoxide
nitrogen (II) oxide
dinitrogen trioxide
22. The name for the compound CuCl2 is:
a.
b.
c.
d.
copper chloride
copper dichloride
copper (I) chloride
copper (II) chloride
23. How many moles are contained in 51 g of NH3?
a.
b.
c.
d.
3 moles
3 × 6.02 × 1023 moles
0.33 moles
0.33 × 6.02 × 1023 moles
24. How many atoms are contained in 20 molecules of PF5?
a.
b.
c.
d.
100 atoms
6 atoms
120 atoms
120 × 6.02 × 1023 atoms
25. How many grams are contained in 6.5 moles of CaBr2?
a.
b.
c.
d.
6.5 g CaBr2
6.5 × 200 × 6.02 × 1023 g CaBr2
6.5 × 200 g CaBr2
6.5 × 120 g CaBr2
Page 4 of 10
26. What is the missing particle in the following equation?
39
19
a.
1
0
b.
1
0
p
c.
1
1
p
d.
K  ?  1736Cl  24 He
e
1
0
n
27. A radioactive isotope decays to give an alpha particle and bismuth-211. What was the original
nucleus?
a.
215
85
At
b.
212
856
Rn
c.
212
83
d.
213
87
Bi
Fr
28. A particular isotope decays with a half-life of 25 years. What fraction of the isotope will remain
after 100 years of decay?
a.
b.
c.
d.
one-half of the original amount of isotope
one-fourth of the original amount of isotope
one-eighth of the original amount of isotope
one-sixteenth of the original amount of isotope
29. A gas is originally confined to a 15.0-L container at a pressure of 4.0-atm and a temperature of
250 ºC. If the volume of the container is changed to 30.0-L and the pressure changes to 8.0-atm,
what is the new temperature of the container?
a.
b.
c.
d.
4.8 × 10-4 K
2092 K
1000 ºC
1 × 10-3 ºC
30. A party balloon filled with helium has a volume of 8.0-L and a pressure of 1.5-atm at a
temperature of 25 ºC. How many moles of helium are contained in this balloon?
a.
b.
c.
d.
2.0 moles of helium
0.5 moles of helium
4358 moles of helium
5.8 moles of helium
Page 5 of 10
31. Which of the following species is an acid?
a.
b.
c.
d.
NaOH
BaO
NH3
HNO3
32. The pH of which of the following solutions would be greater than 7?
a.
b.
c.
d.
HC2H3O2
KOH
HBr
H2SO4
33. The formula for the salt made between the reaction of HBr with Sr(OH)2 would be
a.
b.
c.
d.
H2O
SrBr
SrBr2
SrBr3
34. If the pH of a solution is 6.0, the concentration of H+ is equal to
a.
b.
c.
d.
1 × 10-4 M
1 × 10-5 M
1 × 10-6 M
1 × 10-7 M
35. If the pH of a solution is 8.5, the H+ concentration is between
a.
b.
c.
d.
1 × 10-8 M and 1 × 10-9 M
1 × 10-5 M and 1 × 10-8 M
5 × 10-8 M and 8 × 10-8 M
5 × 10-4 M and 8 × 10-5 M
36. In which of the reactions below (not written as complete reactions) is the reactant oxidized?
a.
b.
c.
d.
Fe3+ → Fe2+
Cr3+ → Cr
O2 → O2Al → Al3+
37. What is the oxidizing agent in the following reaction?
2 Na (s)
a.
b.
c.
d.
+
Cl2 (g) → 2NaCl (s)
Na
Cl2
NaCl
can’t tell from the information given
Page 6 of 10
Short answer problems. You do not get to omit any of these.
38. (6 points) For each of the following species:
a. Draw the Lewis structure
b. Place an “X” in the box below each that corresponds to an intermolecular force that
species would exhibit.
Species:
Lewis structure:
CBr3H
CO2
NH2Cl
Place an “X” in each box below that corresponds to an intermolecular force each compound would
experience.
dispersion
dipole-dipole
H-bonding
39. (6 points) Consider the following reaction (show your work):
N2 (g) + 3 H2 (g) → 2 NH3 (g)
a. If one starts with 56.0-g of N2, how many grams of NH3 could be produced?
b. How many grams of H2 would be required to react with the 56.0-g of N2 from part a?
Page 7 of 10
40. (4 points) A company markets a device it calls a “water eneroxizer”. The device is claimed to
supply so much energy to drinking water that the mass of oxygen is increased, thereby providing
more oxygen to the body. Apply information you have gained this semester along with the
FLaReS principles (falsifiability, logic, reproducibility, and sufficiency) to evaluate this claim.
Page 8 of 10
Potentially Useful Information
Avogadro’s number:
6.02 × 1023
Gas Laws:
PV
PV
1 1
 2 2
T1
T2
PV  nRT
R  0.08206
L atm
mol K
Page 9 of 10
Page 10 of 10