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Question One
Use your periodic table with electronegativity values to answer the following questions relating to molecular
polarity.
A) Assign partial negative and partial positive charges to the covalent bonds below.
i)
H-O
ii)
O-Si
iii)
F-C
B) Draw the Lewis structure and 3-D structure for each molecule below. Provide the name for each 3-D
structure.
Cpd.
Lewis Structure
3-D Structure
Name
SeCl2
CS2
NF3
C) Two molecules are drawn below. Determine if each molecule is polar or non-polar. Provide your reasoning
in the box next to the molecule.
P or NP
P or NP
D) Consider the molecule NH3. What is the strongest intermolecular force NH3 is capable of experiencing?
Explain your answer.
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Question Two
Answer the following questions about states of matter.
1. Carbon tetrachloride is a commonly used organic solvent. It melts at -22.6 oC and condenses at 76 oC.
Use the coordinate below to graph the heating of carbon tetrachloride from -30 oC to 85 oC. Hint:
Think about what happens DURING a phase change.
2. The phase diagram for carbon dioxide is shown below. Answer the following questions about the
phase diagram.
i) Find point X on the diagram. What is it called? What is special about this point?
ii) What occurs along a path from AB? Discuss any phase changes as well as increases and
decreases in temperature or pressure.
iii) What occurs along a path from CD? Discuss any phase changes as well as increases and
decreases in temperature or pressure.
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Question Three
1. An autoclave is a device used to clean biologically contaminated glassware. The machine is sealed
and a quantity of gas is added to the machine’s main chamber. The absolute temperature in the machine
is then doubled. What affect will this have on the pressure in the chamber? Why?
2. Nitric oxide (NO) can be used to remove dangerous ozone (O3) in the atmosphere. When these two
gases react, nitrogen dioxide and oxygen are formed.
a. Balance the equation below
NO + O3 
NO2 +
O2
b. 515 mL of NO and 700 mL of O3 are reacted in a closed setting at 0.5 atm and -10 oC.
i. How many moles each of nitric oxide and ozone are reacting?
ii. What mass of O2 is produced in this reaction?
c. A separate reaction is run and produces 440 mL of oxygen at a pressure of 0.5 atm and a
temperature of -10 oC. What volume will the gas occupy when it is heated to 0 oC and
compressed to 770 mmHg?
3. A chemist needs to prepare a salt water solution capable of attaining a temperature of -7oC. If the
chemist decides to use 350 g of water to make the solution, what minimum mass of salt must be
dissolved in the water?
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This test presents three questions in multiple parts. Complete each part to the best of your ability. Your answer
to one part of a question may or may not affect your ability to answer the next. Each question or part of a
question will be scored on a five-point scale. These scores will be weighted to produce a final grade with a
maximum of 65 points.
Please take your time. This test is designed to take one hour to complete. You have 90 minutes to work. You
may use a periodic table and a calculator to supplement your brain. Please try to answer all the questions on this
test. You may attach extra work if necessary. Good luck.
PV  nRT
P1V1T2  P2V2T1
1atm  760torr

Tk  Tc  273.15
R  0.08206
L  atm
mol K
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Tf ,b  K f ,b m