Remember: This sheet will not be graded. Put all work on your answer sheet!!!! Put your version, name and ID on
your answer sheet or you will lose points.
40015: Version E: Instructions
Midterm is worth 26 points, not including extra credit, which gives you up to 8 extra points.
RIGHT NOW- fill in your ID number, the bubbles and your version letter on the answer sheet, do this now so you don’t
You’ll lose 5 points if you don’t do this on the front page of
the answer sheet.
forget.
There are multiple versions of the exam. The short answers are mostly just rearranged or words such as “increased” are
replaced with “decrease”. The long answers have similar switches as well as changing the numbers around. This makes it
so that 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. I know this is mildly distracting during a stressful exam but it makes sure that if your exam is lost, which I have
heard horror stories of from other professors, that you have proof that you attended class. It is for your benefit!!!!
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 but the scanning department
(who have nothing to do with me or the TAs) take a week to get them back to you. It will be returned to you via the
dropbox (note: not the gradebook, the dropbox) the moment that I get the email allowing me to do so.
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!
Remember this sheet will not be graded, put all answers on your answer sheet. Put your version, name and ID on your
answer sheet or you will lose points
Remember: This sheet will not be graded. Put all work on your answer sheet!!!! Put your version, name and ID on
your answer sheet or you will lose points.
Remember this sheet will not be graded, put all answers on your answer sheet. Put your version, name and ID on your
answer sheet or you will lose points
Remember: This sheet will not be graded. Put all work on your answer sheet!!!! Put your version, name and ID on
your answer sheet or you will lose points.
STP=O oC and 1 atm
Remember this sheet will not be graded, put all answers on your answer sheet. Put your version, name and ID on your
answer sheet or you will lose points
Remember: This sheet will not be graded. Put all work on your answer sheet!!!! Put your version, name and ID on
your answer sheet or you will lose points.
Remember this sheet will not be graded, put all answers on your answer sheet. Put your version, name and ID on your
answer sheet or you will lose points
Remember: This sheet will not be graded. Put all work on your answer sheet!!!! Put your version, name and ID on
your answer sheet or you will lose points.
SCRAP PAPER: DO NOT TURN IN THIS WILL NOT BE GRADED UNDER ANY CIRCUMSTANCE. PUT
ANY WORK THAT YOU WANT GRADED ON THE PROVIDED ANSWER SHEET OR YOU WILL NOT
RECEIVE CREDIT FOR IT.
Remember this sheet will not be graded, put all answers on your answer sheet. Put your version, name and ID on your
answer sheet or you will lose points
Remember: This sheet will not be graded. Put all work on your answer sheet!!!! Put your version, name and ID on
your answer sheet or you will lose points.
Long Answer: Problem 1 (adapted from sapling)
Version E) Green laser light occurs at a wavelength of 0.523 micrometers. A green laser produces a pulse with an energy
of 0.250 J. What is the energy of the photons? How many photons are present in each pulse? If the pulse takes 0.500
seconds, how many photons per second are released?
3.80x10-19J
6.58x1017
1.32x1018
Long Answer: Problem 2 (adapted from slides)
Version E) The work function for gold is 8.17x10-19 J. What is the minimum frequency of light for the photoelectric effect
for gold. Then calculate the kinetic energy of the ejected electron if the light of frequency 1.80x1015 s-1 is used for
irradiating the metal.
1.23x1015 Hz
3.76x10-19 J
Long Answer: Problem 3 (adapted from sapling)
Version E) A line in the Balmer series of hydrogen has a wavelength of 656 nm. From what state did the electron
originate? (Hint: the Balmer series all have a final energy level of 2).
3
Long Answer: Problem 4
Who has the shorter wavelength when running at the same speed. A person weighing 130 pounds, or a person weighing
100 pounds? Explain your logic. Why can’t we see the wavelength of macroscopic objects. (adapted from bookwork and
slides)
130: m is inversely propotional to mass; the wavelength is too small in comparison to the object
Long Answer: Problem 5
Using the following graph from class, explain why the grass is green. What
would happen if you grew plants under green light? Why? (Violet=400 nm,
Indigo=445 nm, Blue= 475 nm, Green= 510 nm, Yellow=570 nm,
Orange=590nm, Red= 650 nm)
Most colors absorb; green is reflected (note: it is reflected NOT emitted)
They’d die
Since they don’t absorb the light it cannot be used for further reactions, i.e.
no photosynthesis ect……
Remember this sheet will not be graded, put all answers on your answer sheet. Put your version, name and ID on your
answer sheet or you will lose points
Remember: This sheet will not be graded. Put all work on your answer sheet!!!! Put your version, name and ID on
your answer sheet or you will lose points.
Short Answer
9) The number of nodes
equals: 1
Naming: (bookwork)
Write the formula for each:
----------------------------------------------------------------------
1) Calcium Nitrate : Ca(NO3)2
2) Potassium Chloride: KCl
Write the name for each:
3) PCl5 phosphorous penta chloride
4) H3PO3 phosphoric acid
---------------------------------------------5) A team of scientists recently developed a series of
nanowires that can act as miniature lasers. One
nanowire was found to emit light of frequency
7.73x1014Hz. What was the wavelength of the light (in
meters)? (worksheet)
3.88x10-7m
6) For the nanowire in the previous problem, what is
the energy of the emitted radiation? (adapted from
slides and bookwork)
5.12x10-19J
---------------------------------------------------------------------Use the picture below of a particle in a box model to
answer the following questions. (adapted from slides)
7) The graph labelled A represents: wavefunction or
position (although position isn’t strictly correct, we
allowed it) or psi
8) The graph labeled B represents: probability density or
psi squared
10) What is the uncertainty
in the position of an electron moving at 4.00x106 m/s
with an uncertainty in velocity of 1.00x103 m/s. (sapling)
5.79x10-8m
11) If you decreased the uncertainty in the velocity,
what would happen to the uncertainty in the position?
(adapted from slides)
increase
12) Which of the following orbitals are most shielded
(assume all orbitals are filled): 1s, 2s, 2p, 3s, 3p, 3d, 4s
(adapted from slides)
3d
13) A 0.105 M MgCl2 solution is prepared. How many
ions of chlorine are present in 300. mL of the solution.
(bookwork)
3.79x1022
14) Given the following reaction, calculate the
maximum mass of copper (II) hydroxide that can be
formed when 4.00 g of sodium hydroxide is added to
160.0 mL of 0.500 M Cu(NO3)2 (bookwork).
Cu(NO3)2 +2NaOH  2Na(NO3)+ Cu(OH)2
4.88g
Remember this sheet will not be graded, put all answers on your answer sheet. Put your version, name and ID on your
answer sheet or you will lose points
Remember: This sheet will not be graded. Put all work on your answer sheet!!!! Put your version, name and ID on
your answer sheet or you will lose points.
15) How many orbitals in a single atom may have the
quantum numbers: n=5 or 4, l=3, ms=+1/2 (slides,
bookwork, sapling and discussion)
14
17) (adapted from slides) In Young’s double slit
experiment the bright areas of light are due to
______________________ (two words)
16) How many electrons in a single atom may have the
quantum numbers: n=5 or 4, l=3, ms=+1/2 (slides,
bookwork, sapling and discussion)
Constructive interference
14
Remember this sheet will not be graded, put all answers on your answer sheet. Put your version, name and ID on your
answer sheet or you will lose points