Chemistry 221
Final Exam
Fall 2011
December 6, 2011
Oregon State University
Drs. Ferguson, Watson, Nafshun, and Knutson
Instructions: You should have with you several number two pencils, an eraser, your 3" x 5" note
card, a calculator, and your University ID Card. If you have notes with you, place them in a
sealed backpack and place the backpack OUT OF SIGHT or place the notes directly on the table
at the front of the room.
Fill in the front page of the Scantron answer sheet with your class section number (see below),
last name, first name, middle initial, and student identification number. Leave the test form
number blank.
Section 001 (MWF 8am with Dr. Ferguson)
Section 003 (MWF 1pm with Dr. Nafshun)
Section 005 (MWF 3pm with Dr. Knutson)
Section 002 (MWF 10am with Dr. Watson)
Section 004 (MWF 2pm with Dr. Nafshun)
Section 006 (MWF 6pm with Dr. Knutson)
This exam consists of 33 multiple-choice questions; each has 5 points attached. The last
question (Question 34) has 3 points attached. When you finish this exam, proceed to the proctor.
Submit your completed Scantron form. You may take your notecard and exam packet with you.
h = 6.626 x 10-34 J·s
nano (n) = 10
-9
 
c

c = 3.00 x 108 m/s
E = hν
𝜆=
ℎ
𝑚𝑣

H°f
(kJ/mol)
H°f
(kJ/mol)
H°f
(kJ/mol)
CO2 (g)
- 393.5
C6H6 (g)
+49.0
BeO (s)
- 609.4
CO2 (aq)
- 413.8
CH3OH (g) -201.2
H2O (l)
- 285.8
C3H8 (g)
- 104.0
NH3 (g)
-46.2
H2O (g)
- 241.8
______________________________________________________________________________
Material
H2O (l)
CH3CH2OH (l)
Pb (s)
Au (s)
Ag (s)
Cu (s)
Fe (s)
Al (s)
Sand
Pyrex Glass
Specific Heat (J/g°C)
4.184
2.42
0.128
0.128
0.235
0.385
0.449
0.903
0.84
0.75
1
2
1 inch = 2.54 cm (exact)
1000 mm = 1 m
1 mole (NA) = 6.022 x 1023
10 dm = 1 m
1000 m = 1 km
1000 mL = 1 L
100 cm = 1 m
10 mm = 1 cm
1 mL = 1 cm3
9 Polyatomic Ions
Name
Formula
Hydroxide
OH-
Cyanide
CN-
Nitrate
NO3-
Acetate
CH3COO-
Carbonate CO32Phosphate PO43Hydronium H3O+
Ammonium NH4+
Sulfate
SO42-
3
1.
The repeat distance between twists in the DNA helix is 0.00034 μm. What is this in pm?
(A)
(B)
(C)
(D)
(E)
2.
3.4 x 10-11 pm
0.34 pm
3400 pm
340 pm
3.4 x 106 pm
The diagram shows a block made by welding iron (density 7.90 g/cm3) with titanium
(density 4.50 g/cm3). What is the mass of the whole block?
4.00 cm
Fe
Ti
2.00
cm
(A)
(B)
(C)
(D)
(E)
3.
3.00 cm
5.00 cm
0.370 kg
180. g
0.288 kg
190. g
0.506 kg
How many significant figures (sf) will there be in the results of the expressions:
(i) (1.40 × 10-1 + 50.0) and (ii) 1.4 × 10-1 x 50.00)?
(A)
(B)
(C)
(D)
(E)
(i) sf = 2;
(i) sf = 2;
(i) sf = 3;
(i) sf = 3;
(i) sf = 3;
(ii) sf = 2
(ii) sf = 3
(ii) sf = 2
(ii) sf = 3
(ii) sf = 4
4
4.
Gasoline currently sells at a station in Corvallis for $ 3.65 / gallon. My new GasGuzzler
Personal Suburban Assault Vehicle has such poor gas mileage that it needs a tank that is
1.00 m3 in volume. How much will a fill-up of gasoline cost? (1 gallon = 3.785 L )
(A)
(B)
(C)
(D)
(E)
5.
What are the full chemical names for PCl3 and FeCl3?
(A)
(B)
(C)
(D)
(E)
6.
$ 3518
$ 964.
$ 999
$ 365.
$ 0.365
potassium chloride, iron(III) chloride
phosphorus(III) chloride, iron trichloride
potassium(III) chloride, iron(I) chloride
phosphorus chloride, iron chloride
phosphorus trichloride, iron(III) chloride
Which is the correct definition of an isotope?
(A)
(B)
(C)
(D)
(E)
Atoms of the same element with different numbers of electrons.
Atoms of the same element with different numbers of protons.
Atoms of the same element with the same number of neutrons but with different
numbers of protons.
Atoms of the same element with the same number of protons but with different
numbers of neutrons.
Atoms of the same element with the same number of protons and neutrons.
5
7.
Which compound would you expect to be ionic?
(A)
(B)
(C)
(D)
(E)
8.
How many atoms of oxygen are present in 8.4 g of sodium hydrogen carbonate,
NaHCO3? [NA is 6.022 x 1023; Avogadro's number]
(A)
(B)
(C)
(D)
(E)
9.
COS
COCl2
CoS
CS2
TiCo
(3/10)NA
NA
(2/5)NA
(1/2)NA
(1/4)NA
What is the % N by mass in the compound Mg(NO3)2?
(A)
(B)
(C)
(D)
(E)
9.44 %
32.4 %
16.2 %
18.9 %
14.0 %
6
10.
A compound was found to be 50.0 percent oxygen by mass, 12.5 percent hydrogen by
mass, and the remainder carbon. What is its empirical formula?
(A)
(B)
(C)
(D)
(E)
11.
CHO
CH2O
CH3O
C2H2O
CH4O
When the reaction
a HCl (aq) + b CaCO3 (s) → c CaCl2 (aq) +
d H2O (l) + e CO2 (g)
is balanced, the sum (a + b + c + d + e) is
(A)
(B)
(C)
(D)
(E)
12.
5
6
8
10
20
Which of the following quantum numbers describes the shape of an orbital?
(A)
(B)
(C)
(D)
(E)
Principal quantum number, n
Angular momentum quantum number, l
Magnetic quantum number, ml
Spin quantum number, ms
The wavelength, 𝜆
7
13.
Select the correct set of quantum numbers for one of the highest energy electrons in the
ground state of calcium, Ca. (n, l, ml, ms)
(A)
(B)
(C)
(D)
(E)
14.
Which atom has the following electron configuration in the ground state, [Ar]4s13d5?
(A)
(B)
(C)
(D)
(E)
15.
Mn
Co
Fe
Ca
Cr
The standard enthalpy of formation (∆Hfº) refers to:
(A)
(B)
(C)
(D)
(E)
16.
1,1,1, ½
4,1, 0, ½
4, 1, -1, ½
4, 0, 0, ½
1, 0, 0, ½
The enthalpy change to make one mole of an element in its standard state at 1 atm.
The heat change at constant volume to make one mole of a compound from its
elements in their standard states.
The enthalpy change to make one mole of an compound in its standard state from its
elements in vacuum.
The heat change at 1 atm to make one mole of a compound from its elements in their
standard states.
The heat released/absorbed at 1 atm when 1 mole of a compound in its standard state
is combusted in oxygen
A 35.2 g sample of metal that had an initial temperature of 100.0 ˚C was added to 50.0
grams of water initially at 25.32 ˚C. The temperature of the water increased to 29.64 ˚C.
What is the specific heat of the piece of metal?
(A)
(B)
(C)
(D)
(E)
0.365 J/g°C
0.255 J/g°C
96.8 J/g°C
4.184 J/g°C
9.68 J/g°C
8
17.
Which of the following processes is NOT exothermic?
(A)
(B)
(C)
(D)
(E)
18.
Rain condensing from water vapor in the atmosphere
The reaction of sodium with water
Dissolving CaCl2 in water causing an increase in temperature
Melting ice
Snow forming in clouds
Calculate the heat of reaction for the following reaction, 2 S (s) + 3 O2 (g) → 2 SO3 (g),
from the enthalpies of these related reactions:
ΔHrxn
-296.9 kJ
+196.6 kJ
Reaction
S (s) + O2 (g) → SO2 (g)
2 SO3 (g) → 2 SO2 (g) + O2 (g)
(A)
(B)
(C)
(D)
(E)
19.
-790.4 kJ
+790.4 kJ
-397.2 kJ
+397.2 kJ
-100.3 kJ
What is ΔH˚reaction for the following reaction?
CH3OH (g)
(A)
(B)
(C)
(D)
(E)
+
3/2 O2 (g)
→
CO2 (g)
+
2 H2O (g)
-877.1 kJ
-74.8 kJ
+877.1 kJ
-675.9 kJ
0 kJ
9
20.
A student
reacts 50.6 grams of magnesium hydroxide (58.32 g/mol) with 45.0 grams
of hydrogen chloride (36.46 g/mol). If the student collects 55.3 grams of magnesium
chloride (95.21 g/mol), what is her percent yield?
Mg(OH)2 (s)
(A)
(B)
(C)
(D)
(E)
21.
+
2 HCl (g)
→
MgCl2 (s)
+
2 H2O (l)
94.4%
91.2%
80.2%
74.0%
40.1%
The frequency of blue photons having a wavelength of 480 nm is:
(A)
(B)
1
s
1
480 x 109
s
480 x 10-9
(C)
3.18 x 10-31
(D)
1.44 x 102
(E)
1
s
1
s
1
6.25 x 1014
s
10
22.
The ground-state electron configuration of a Ti3+ ion is:
(A)
(B)
(C)
(D)
(E)
23.
Which of the following has the greatest effective nuclear charge (Zeff)?
(A)
(B)
(C)
(D)
(E)
24.
[Ar]4s23d1
[Ar]4s1
[Ar]4s23d2
[Ar]4s2
[Ne]3d1
Li
Be
B
O
F
Consider Mg and Mg2+. Consider O, and O2-. Which of the following statements is
correct?
(A)
(B)
(C)
Mg is larger than Mg2+
O is larger than O2This question is ambiguous and cannot be answered without a data table
11
25.
The covalent bond in HF is described as a polar covalent bond. This can be attributed to:
(A)
(B)
(C)
(D)
(E)
26.
Which of the following is expected to be the greatest ionization energy?
(A)
(B)
(C)
(D)
(E)
27.
The difference in IE1 and IE2 for either H or F
The difference in the electronegativities of H and F
The difference in the atomic radii of H and F
The difference in the radii of H and H+ (the cation)
The difference in the radii of F and F- (the anion)
IE1 for Mg
IE2 for Mg
IE1 for Li
IE1 for He
IE1 for K
The Lewis Dot Structure of phosphine, PH3, depicts:
(A)
(B)
(C)
(D)
(E)
There are no lone pairs of electrons.
There is one lone pair of electrons.
There are two lone pairs of electrons.
There are three lone pairs of electrons.
There are four lone pairs of electrons.
12
28.
Select the best representation of HF.
13
29.
Consider the Lewis Dot Structures for PCl5 and BH3. Which of the following is FALSE?
(A)
(B)
(C)
(D)
(E)
30.
The Lewis Dot Structure for PCl5 depicts no lone pairs of electrons about the
central atom.
The Lewis Dot Structure for BH3 depicts no lone pairs of electrons about the
central atom.
The Lewis Dot Structure for BH3 depicts just six total electrons about the central
atom (less than an octet).
When constructing a Lewis Dot Structure for PCl5, a total of 40 valence electrons
are placed about the six atoms.
When constructing a Lewis Dot Structure for BH3, boron has an expanded octet.
Below are two Lewis Dot Structures for sulfuric acid. Which statement about these
structures is correct?
(A)
(B)
(C)
(D)
(E)
In Structure 2, by expanding the octet about sulfur the formal charges on all atoms
are zero.
In Structure 1, the formal charge on sulfur is zero.
In Structure 1, the total number of electrons shown in the structure is incorrect.
In Structure 2, sulfur has too many bonds.
Structure 2 must be incorrect because expanded octets are never observed before
the fourth period.
14
31.
There are ________ resonance forms for the carbonate ion, CO32-.
(A)
(B)
(C)
(D)
(E)
32.
Which of the following contains the strongest carbon-carbon bond?
(A)
(B)
(C)
33.
0
1
2
3
4
The carbon-carbon bond in C2H2
The carbon-carbon bond in C2H4
The carbon-carbon bond in C2H6
A student proposes the Lewis Dot Structure below for HCOOH. Determine the formal
charges on the top oxygen (Oxygen #1), the carbon, and the right oxygen (Oxygen #2).
(A)
(B)
(C)
(D)
(E)
Oxygen #1
-1
-1
+1
+1
-1
Carbon
+1
0
-1
0
0
Oxygen #2
0
+1
0
-1
-1
15
34.
Because of CH 221...
(A)
My manners have improved.
(B)
I’ve been getting a whole lot of dates by using pick-up lines that include the
words orbitals, lobes, electromagnetic, polar, and covalent bond.
(C)
I have laughed more times in the past ten weeks than I have in the previous ten
years.
(D)
I have attained a magnetic personality.
(E)
I want to build something really cool; like a device that will assimilate class
lectures and cram that knowledge into my brain. This would allow me to nap or
play video games or twinkie tweet during Chem Class.
Questions 1 through 33 each have 5 points attached. Any response to Question 34 will
receive full credit (3 Points); even no response.
Final exam keys, scores, and course grades will be posted on the CH 221 website and in
Blackboard as they become available.
Have an excellent and safe Winter Break :)
16