Version D: Instructions
Midterm is worth 85 points, not including extra credit, which gives you up to 16 extra
points.
For multiple choice- please circle the letter and fill in completely. If you don’t do this
there will be grade consequences!!!!
1. A B
C D
E F
RIGHT NOW- fill in your ID number, the bubbles and your version letter on the answer
sheet, do this now so you don’t forget.
There are four versions of the exam. The difference in the multiple choice is the
rearrangement of letters, and the short answers are designed to look similar. If you copy,
you are most likely copying the wrong answer, this makes cheating even more
pointless than normal, please don’t do it.
If you think someone nearby may be copying, or something is simply disturbing you,
please let me know and we can adjust people’s seats appropriately. Tell me as early as
possible.
Be sure to sign the sign in sheet. This is my record that you attended the class. If you
are not sitting in your assigned seat for a reason approved by me, you’ll need to make
sure to write the seat where you are actually sitting next to your name.
You will also need to show your ID to the TA when you turn in your exam.
Only the answer sheet will be graded. You may (and should) keep the exam
sheet. Go home, retake it, see how you did . If you write any work on scrap paper, the
question sheet or anywhere other than the space given, it will not be graded and you will
not get any credit for it. Do not write on the back of the sheets, do not write anything you
want graded anywhere other than the space given. I’d suggest writing in pencil or doing
scratch work elsewhere and then copying over.
I think it’s a fairly long exam. Pace yourself, pay attention to point distribution and do
your best to complete it all.
Exams will be sent through eee dropbox. They will be graded the same day as you take it,
and the grades will be posted at least by the next morning, if not sooner. It will take a
week or more to get the exams back to you depending on how backed up the system is. I
can’t make this go faster, it is completely out of my hands.
Finally, relax. At that point there is nothing that being stressed will do for you. So take
a deep breath, pick up your writing utensil and show me how amazing you are at
chemistry!
1. Name the following compound: (NH4)2SO4
Ammonium Sulfate
2. Provide the appropriate counter ion for Fe to
provide the empirical formula FeSO4
+2
11. What is the result of hybridizing a single s orbital
and two p orbitals? Including what (if any) leftover
orbitals the molecule will have to bond with.
D. 3 sp2 orbitals and 1 p left over
For Questions 12-14 Refer to the following figure
3. Name CrCl6
Chromium (VI) hexachloride
4. The anaesthetic gas chloroform is made up from
10% Carbon, 0.80% Hydrogen, and 89.2% Chlorine.
Its molecular mass is 119.3 g/mole What is it’s
formula?
HCCl3
Cl
O
Cl
S
O
O
Cl
5. The work function for silver is 7.53x10-19 J. What
is the threshold frequency?
B. 1.13 × 1015 Hz
6. An iron heats up to 3593C, what is the maximal
wavelength of its black body radiation?
D. 7.500 *10 -7 m
7. Which of the following statements are true about
wavefunctions?
A. The wavefunction does not describe the
movement of particles
B. Different particles have different wavefunctions
C. The probability density function says how likely it
is to find a particle within a region
D. The sign for the probability density function
should always be positive
E. The sign for the wave function should always be
positive
F. B, C, D
G. D, C, D, E
8. What is the initial energy level of an electron when
a photon of energy 1.635*10-18 J promotes it to the
n=2 level. (Hint: save yourself time on this, think
before you calculate)
A. 1
9. A lithium atom has an average speed of 1121 m/s
has its uncertainty of velocity within 783 nm/s. What
is the uncertainty in the position?
G. 5.840 *10 -3 m
10. Give the electron configuration for Nb3+
E. [Kr] 4d2
12. What is the electronic geometry around the
sulfur?
octahedral
13. What is the molecular geometry around the
sulfur?
Square pyramidal
14. Using hybrization theory, which orbitals do the
carbons (either one) use to bond with the oxygen?
A. sp2 orbitals
15. Which orbitals are the least shielded?
A. 3d
E. 3p
B. 4f
F. 4p
C. 1s
G. 4s
D. 2s
16. Which of the following elements is the least
electronegative?
A. chromium
E. neon
B. phosphorous
F. lithium
C. potassium
G. francium
D. chlorine
17. Please give the proper electron configuration for
W+
[Xe] 5d54f14
18. Which of the following have the smallest atomic
radius?
Be 2+
19. With which orbitals does XeF44+ use to bond?
sp3 orbitals
D. O2
26. What is the correct Lewis dot structure for I3-?
20. Which of the following molecules has no net
dipole moment
CCl4
21. Which of the following statements are true about
H2 bonding?
A. They use s orbitals
B. They use s orbitals, when bonding to each other in
H2 but hybrid orbitals when bonding to atoms that
use hybrid orbitals
C. The optimal bond distance will have the highest
potential energy
D. They have a  bond
E. The optimal bond distance will have the lowest
potential energy
F. A. and D.
G. A, D, and E.
22. What are the bond angles of the following; please
refer CAREFULLY to figure for reference.
I
I
27. Choose the correct structure for BF3. (Assume the
lone pairs on the F complete the octet as needed)
F
B
F
F
28. Which of the following statements are true about
valance bond theory:
A.  bonds are freely rotatable
B. a π bond is freely rotatable
C. The two π bonds stemming from one atom occupy
parallel planes
D. π bonds are made from s orbitals
E. a π bonds has two lobes
F. A,C, D, E,
G. A, E
4
O
3
O
N
1
2
1: <109.5,
I
2: 120,
3: 109.5,
4: 180
23. If you have 6 electrons in bonding orbitals, and 4
electrons in antibonding orbitals, what is the bond
order?
1
24. Using MO theory predict which of the following
diatoms should be the most stable?
A. N2
E. None of them are stable
B. He2
F. They are all equally stable
C. Li2
G. MO theory can’t be used for this
D. Be2
25. Using MO theory predict which of the following
diatomics should be the least stable?
A. N2
E. None of them are stable
B. He2
F. They are all equally stable
C. Li2
G. MO theory can’t be used for this
29. Which of the following would be expected to
have the lowest boiling point?
A. N2
E. Ne
B. Cl2
F. PCl3
C. pentane
G. Carbon monoxide
D. water
30. Which of the following has the highest boiling
point?
A. CH4
E. O3
B. CH3CH3OH
F. O2
C. CH3OCH3
G. HCOCH3
D. CH3CH3
31. A balloon contains argon at 7 atm and 4°C is
heated to 90°C. Calculate the final pressure.
9.17 atm
32. Calculate the moles of H2 at 300.C, 2.7 atm, in a
3.0 L balloon.
0.17 mol
33. What volume will one mol of and ideal gas
expand to occupy by an ideal gas at STP?
22.4 L
34. A mixture of gases of called nitrox is used by
marine biologists to safely investigate the deep
depths of the ocean is composed of 26% oxygen,
17% helium and 57% nitrogen. If the total pressure
is 600 atm, what is the partial pressure of O2?
156 am
35. Which of the following statements are true about
kinetic theory of gasses
A. Certain gas molecules may interact based on their
dipole moments
B. Average gas kinetic energy is proportional to
temperature
C. Slower colder gases have a tighter distribution of
speeds
D. Every gas molecule’s kinetic energy is
proportional to temperature
E. B and C
F. B and D
G.A and C
36. Calculate the rms of Ne at 298 K
606.9 m/s
37. Find the ratio of rates of effusion of CO2 vs CO
0.798
38. Rank the following in Increasing rates of
effusion: N2 and NO2 and N2O5 and O2
N2O5 NO2 O2
N2
Short Answer 1
Suppose you take a trip to a distance universe and find that the periodic table there is derived from an
arrangement of quantum numbers different from the one on earth. The rules for quantum numbers in this
universe are as follows. Assume Pauli exclusion principle, Aufbau and Hund’s rules are still in effect.
1) Principal quantum number (n) is the same as our universe.
2) angular momentum quantum number (l) is the same as on earth.
3) the magnetic quantum number ml=0,1,2,….l. (positive numbers up to l)
4) the spin quantum number ms= -1, 0, +1
A) What is the maximum number of electrons in an orbital in this universe? 3
B) What is the electron configuration for the atom with atomic number 3? 1s3
C) What is the atomic number of the first noble gas? 3
D) Tell me what the rules for number 3 and 4 are in our universe.
ml= -l to +l
ms= +/- ½
Short Answer 2
Explain under what circumstances a gas is most ideal. For each parameter explain how this makes it more ideal.
Low pressure, because the volume of the particles matters less (also less interactions)
High temperature, there are less interactions.
Short Answer 3
One chamber with a volume of 5.5 L, temperature of 337K and 2.3 *1023 atoms of He gas is connected to a
second chamber with O2 and a known pressure of 0.7 atm, and a volume of 11.0 L at 40 C. When the plug
between them is removed, what is the partial pressure of each gas. What is the final pressure in the new space?
0.567 atm He, 0.444atm O2, Total 1.01 atm
Short Answer 4
What is the energy and frequency of light associated with an emitted photon in a hydrogen transitioning from
the n=3 to n=1 level?
+1.937x10-18 J,
2.925x1015 Hz