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CHEM 237 Final Exam Review TAMU Questions and Answers with Expert Verified Solutions
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CHEM 237 Final Exam Review TAMU Questions and Answers with Expert Verified Solutions
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CHEM 237 Final Exam Review TAMUQuestions and Answers with Expert Verified
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A nonvolatile impurity dissolved in a liquid:
a. raises the boiling point and the vapor pressure
b. lowers the boiling point and the vapor pressure
c. raises the boiling point and lowers the vapor pressure d.
lowers the boiling point and raises the vapor pressure
e. has no effect on the boiling point or the vapor pressure - ✔✔raises the boiling point and lowers
the vapor pressure
Arrange the following substituted cyclohexanes in order of increasing total steric strain (lowest
strain energy first).
Interaction Cost (kJ/mol)
CH3<—>CH3 Gauche 3.8
CH3<—>H Diaxial 3.8*
*Energy cost for a single 1,3‐diaxial interaction
1. 1,3-dimethylhexane both in axial config.
2. 1,2-dimethylhexane in gauche config.
3. 1,4-dimethylhexane both in equatorial config.
4. 1,4-dimethylhexane both in axial config.
a. 3 - 1 - 2 - 4
,b. 3 - 2 - 4 - 1
c. 1 - 2 - 3 - 4
d. 2 - 3 - 1 - 4
e. 4 - 3 - 1 - 2 - ✔✔3 - 2 - 4 - 1
Solutions of potassium permanganate may cause chemical burns and unsightly discolorations on
your skin. Wash the affected area with
a. dilute acetic acid
b. soap and warm water
c. dilute sodium hydroxide
d. silver nitrate solution
e. sodium bicarbonate - ✔✔soap and warm water
When you tested mixture melting point temperatures in the lab, your records showed that:
a. the melting point of your unknown compound will not change no matter what you are mixing it with,
so the melting point range will stay always narrowed and not depressed.
b. the melting point of your unknown compound will be lower and the range broader if you mixed it
with an organic compound different from your unknown.
c. organic compounds and insoluble inorganic compounds that do not mix when melted give a melting
range that is sharp even though there are inorganic impurities in the sample.
d. b and c only
e. a and c only - ✔✔b and c only
higher vapor pressure= ____ volatile and ____ boiling point - ✔✔more; lower
In the preparation of 3‐chloro‐3,7‐dimethyloctane, you performed a silver nitrate test on the product.
Hopefully, you witnessed the immediate formation of a white precipitate. What was the precipitate?
a. Ag(NO)3
b. AgCl
c. AgNO3
, d. AgBr
e. AgI - ✔✔AgCl
In recrystallization, a hot filtration is sometimes carried out in order to:
a. remove the insoluble, solid impurities
b. decrease the amount of solvent
c. allow the volatile impurities to escape
d. remove soluble impurities
e. induce crystallization - ✔✔remove the insoluble, solid impurities
At what temperature is a high‐boiling, high molecular weight, water‐immiscible compound distilled
out during a steam distillation?
a. It changes as concentration changes
b. Just a little below its normal boiling point
c. A little above the boiling point of water
d. At the exact boiling point of water
e. Just below the boiling point of water - ✔✔Just below the boiling point water
The movement of the liquid mobile phase in TLC is caused by:
a. a pressure differential
b. gravity
c. adsorption
d. capillary action
e. vapor pressure - ✔✔capillary action
In the boiling point‐composition diagram below, boiling
a mixture of 60% methanol and 40% water will yield a
vapor which is:
a. 20% methanol
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