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CEM 141 Final Exam Mock Quizzes- ANS-Which diagram shows molecules of a compound?
[Ar] 4s2 3d10 4p4 - ANS-what is the electron configuration of Se?
+ (see quiz answer key 4 for picture) - ANS-For the process shown deltaH (for the system) is:
+1 - ANS-what is the formal charge on the nitrogen?
0 - ANS-How many molecules of CH4 will remain at the end?
1.45 x 10^-9 m - ANS-What is the wavelength of an electron travelling at 5.01 x 10^5 m/s? The
mass of an electron is 9.1 x 10^-31 kg.
10 cm - ANS-what is the wavelength of light that has a frequency of 3.0 GHz (3.0 x 10^9 Hz)?
2 (see quiz key 3 for picture) - ANS-consider an uncharged molecule with the following
connections:
use these connections to draw the complete lewis structure. when the most stable lewis
structure is written, how many double bonds will the molecule contain?
2 core, 4 valance - ANS-how many core and valance electrons does carbon have?
200K (see quiz answer key 4 for picture) - ANS-the graph below shows the distribution of
velocities for He at the five temperatures given below.
Which temperature corresponds to the distribution indicated by the arrow?
240 nm - ANS-it takes 8.3 x 10^-19 J break the O=O bond in one molecule of O2. What
wavelength of light would break an O=O bond?
3 - ANS-How many molecules of CO2 will be produced?
3 - ANS-How many molecules of O2 will remain at the end?
6 (see quiz key 2 for picture) - ANS-How many molecules of H2O will be produced?
all are true - ANS-Which of these statements are true:
I. All neutral atoms and molecules attract each other.
II. London dispersion forces increase as the size of the electron cloud increases.
III. It takes energy to overcome the attractions between particles.
, IV. Energy is released to the surroundings when atoms form a stable interaction.
as more bromine molecules get more energy, they can overcome the electrostatic forces of
attraction and the bromine molecules can escape into the gas phase - ANS-if you put bromine
liquid in a pan on the stove and heat it up the bromine will boil. What is the mechanism by which
bromine boils?
as more bromine molecules get more energy, they can overcome the electrostatic forces of
attraction and the bromine molecules can escape into the gas phase. - ANS-if you put bromine
liquid in a pan on the stove and heat it up, the bromine will boil. what is the mechanism by which
this boiling process happens?
B - ANS-Which diagram best shows hydrogen in the liquid phase?
because they absorb photons and re-emit them. - ANS-why are metals shiny?
BF3 - ANS-which of these substances has/have a trigonal planar molecular shape?
C (see quiz key for picture) - ANS-Which diagram best shows hydrogen at 50K (in the gas
phase)?
CaF2 - ANS-what is the most likely formula for the compound formed between calcium and
flourine?
CH4 - ANS-which of the following would you predict to have the smallest ΔHvap? (The heat
required to change one mole of substance from a liquid phase to a gas phase [vaporize]?)
Copper (c=0.385 J/gc) - ANS-if the same amount of thermal energy were transferred to equal
masses of water, copper, granite, and ethanol, which substance would reach the highest
temperature?
D (see quiz answer key 2) - ANS-which of the following transitions would be most likely to result
from the absorption of a photon of the highest frequency?
diameter of a carbon nanotube - ANS-the wavelength of the electron that you calculated in
question 11 is closest in size to:
each photon of blue light has enough energy to eject one electron - ANS-For a given photocell
(a device that uses the photoelectric effect to generate electricity), blue light will eject electrons,
but red light will not. Why?
electrons moving to higher energy levels and absorbing photons of energy equal to the energy
difference between the levels - ANS-atomic absorption spectra are caused by
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