1
CHEM 111Your full name (PLEASE PRINT) ______
First hour test page 1 of 5
October13, 2010Your scheduled class hour (please circle) B hr E hr
Make sure your test has FIVE pages---notify us immediately if it does not. Do NOT detach pages from the staple. You may use a writing implement, hand-calculator, and your Periodic Table (unmarked, honor code) as obtained in this course. NO scratch paper is permitted! As requested of the faculty by the Student Executive Committee, students must sit in every other seat during the test. Your work must be shown clearly on all problems, and final answers must be expressed in scientific notation. Pay attention to dimensions!! When blanks for answers are provided, write your answer to be graded in the blank---I may not grade answers written in other locations!
It is your responsibility to make sure the test you turn in has 5 securely fastened pages.
These constants may apply to problems you face. Note that you must decide how many significant figures you should use for these constants based on the context of the problem!
dimensions of the Joule (J) = kg.m2.s-2 / c = 2.99792458 x 108 m/s,1 eV = 1.602177 x 10-19 J / mass of electron, me = 9.1093819 x 10-31 kg
h = 6.626076 x 10-34 J.s, / mass of proton, mp = 1.672616 x 10-27 kg
kB (Boltzmann’s constant) = 1.38066 x 10-23 J.K-1 / charge of electron, e = 1.6021773 x 10-19 C
Rydberg constant, RH = 1.09740 x 107 m-1 / Avagadro’s number,
Gas Constant, R = 0.08206 L.atm.mol-1.K-1 or R = 8.314 J.mol-1.K-1
PRE-PLEDGE: I will neither give nor receive any unacknowledged aid on this test.
Signed, ______
1.(8 pts) How many radial and angular nodes are associated with the following orbitals?
a) angular:______radial______
b) angular:______radial______
2.(6 pts) In the space provided, identify the atomic orbital whose probability density is shown below (note that lighter areas indicate higher probability):
ZZ
XX
Orbital Name ______Orbital Name ______
3.(6 pts) How many angular nodes and radial nodes are associated with the following eigenfunction:
angular:_____ radial:______. What atomic orbital is this wavefunction describing?______
4.(10 pts) Please fill out the table below for each molecule or ionic compound:
Formula / e--pool / dot picture(draw clearly) / e-- pair shape
(sketch and name) / molecular shape
(sketch and name) / #- bonds:
(if resonance, draw here)
Nitrite Ion
5.(6 pts) Give the electron configurations for the following species:
A. Give SHORT-FORM ELECTRON CONFIG. B. Give ELECTRON DOT PICTURE
______
______
______
6.(8 pts) The following pairs of substances were first, as separate substances, mixed with water. Then the two aqueous mixtures were combined with thorough stirring. For each pair:
(a) & (b) show by appropriate formula(s) what would be present in the separate mixtures;
and then
(c) deduce and write the balanced chemical equation for the reaction which occurs when the two mixtures are combined. If no reaction occurs upon mixing, write "No reaction!"
HI and silver nitrate
(a)(b)
(c)
phosphoric acid and excess potassium hydroxide
(a)(b)
(c)
7.(8 pts) You are an engineer designing a switch that works by the photoelectric effect. The metal that you wish to use in your device requires to remove an electron. Will the switch work if the light falling on the metal has a wavelength of 539 nm? Show your reasoning. (Note that 1nm=10-9 m = 10-3 pm.)
Answer:______
8.(8 pts) Define the following terms briefly and accurately:
(a) The Heisenberg Uncertainty Principle: ______
(b) Ionization Energy: ______
(c) The Schrodinger Equation: ______
(d) The DeBroglie relationship______
9.(2 pts) Circle one: true or false: The Hartree-Fock- Self Consistent Field model approximation treats each electronas if it were interacting with a central charge that is a combination of the nucleus and other electrons.
10.(2 pts) Circle one: true or false: The Pauli Exclusion Principle states that no two electrons can have the same set of four quantum numbers: n, l, ml, and ms
11.(2 pts) Circle one: true or false: The source of differences among the various elements of the periodic table is quantum mechanically due to the potential part of the Hamiltonian operator.
12.(2 pts) Circle one: true or false: Zeffis a function of both n and l.
13.(2 pts) Circle one: true or false: All people are both particle-like and wave-like, but you never see their wavelike behavior.
14.(2 pts) Circle one: true or false: The ability to measure the position of an object along a specific axis and with a certain accuracy affects the ability to measure the velocity of that particle along the same axis.
15.(2 pts) Circle one: true or false: In general, Zefffor a given element decreases with increasing n (for a constant l).
16.(2 pts) Circle one: true or false: The magnitude of Zeff is determined by the size of the nucleus and the interaction of the nucleus with the electrons other than the electron of interests.
17.(6 pts) An electron moves with a velocity of . What is the wavelength in meters of this electron?
Answer:______
18.(4 pts) Which of the following combinations of quantum numbers are allowed for an electron in a one electron atom? Circle the letter(s) for which the set of quantum numbers are allowed.
(a) n= 2 l= 2, ml= -1, ms= -1/2(b) n= 3, l= 2, ml= 0, ms= -1/2
(c) n= 46, l= 33, ml= 12, ms= 1/2(d) n= 2, l= 1, ml= 0, ms= 3/2
19.(6 pts) Calculate the frequency of light emitted when an electron changes from n=3 to n=1 in an Li2+ atom
Answer:______
20.(2 pts) Circle one: true or false: There are different molecular vibrationsfor H2O and each vibration involves all of the atoms.
21.(2 pts) Circle one: true or false: The computational chemistry that you did in lab provided information about molecular bond length that was more accurate than experimentally determined values.
22.(2 pts) Circle one: true or false: General trends of bond angles (“H-X-H”) can be determined using computation, even if the actual angles are different from those measured experimentally.
23.(2 pts) Circle one: true or false: Computational chemistry is cool(!!) and I look forward to doing it next lab.
PLEDGE: I have neither given nor received any unacknowledged aid on this test.
Signed, ______