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CHEM 219 Final Exam Questions And Correct Answers
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CHEM 219 Final Exam Questions And Correct Answersc=νλ - Answer E = hv = h x c / λ
nm to m
or
m to nm - Answer 1 m / 10^9 nm
or
10^9 nm / 1 m
How many electrons can have the quantum numbers n = 3, ℓ = 2, mℓ = -2? -Solution The
Pauli exclusion principle states that no two electrons in a given atom can have the same
set of four quantum numbers for n, ℓ, mℓ, ms. There is one missing quantum number in
this set, which is ms. There are only two values this quantum number can have. They are
+½ and -½. Therefore, this set of three quantum numbers describes one atomic orbital
that can contain two different electrons: one with ms = +½ and one with ms = -½.
An exothermic reaction causes the surroundings to - Answer An exothermic reaction
transfers energy from the system to the surroundings. That tells us the surroundings will
get warmer.
A theory is another word for a(n) ________. Answer A theory or model is a well
established explanation of a phenomenon based on a series of facts and a body of
evidence.
What is the definition of a natural law? Answer A scientific law summarizes an
observable behavior.
The skeletal structure of a complex organic molecule is below. Determine the total
number of σ and π bonds in this molecule. Solution remember - a single bond has 1σ, a
double bond has 1σ + 1 π, a triple bond has 1σ + 2 π. There is 6 double bonds so 6σ and
6π. There is 28 single bonds left, so there is 28 σ. This a total 34σ and 6π.
, strontium phosphate - Answer Sr₃(PO₄)₂
Which of the following is true? - Answer One driving force in the vaporization of a liquid
is an increase in disorder (entropy). Gas molecules are more disordered than liquid
molecules. Adding a non-volatile solute to a liquid also increases the disorder of the
liquid molecules, so the difference in disorder between the liquid and gas phases is not
as great as with a pure substance. Consequently, the tendency to vaporize is not as
great for the solution as for the pure liquid, and the vapor pressure for the solution is
lower.
Which one of the following aqueous solutions would have the highest boiling point?
A) 1.0 m NaNO3
B) 1.0 m HF
C) 1.0 m C₆H₁₂O₆
D) 1.0 m CaCl2 Explanation The dissolved solute will raise the boiling point. The greater
the number of "things" dissolved (ions or molecules), the higher the boiling point will be.
The CaCl₂ will dissociate into one Ca²⁺ ion and two Cl⁻ ions and there will be a
concentration of 3.0 m of "things" in solution. The other choices will have fewer "things"
in solution and will raise the boiling point less.
Which of the following aqueous solutions would have the highest freezing point?
A) 1.0 m NaNO3
B) 2.0 m CH3OH
C) 1.0 m C₆H₁₂O₆
D) 1.0 m CaCl2 - Answer The dissolved solute will lower the freezing point. The more
"things" that are dissolved (ions or molecules), the lower the freezing point will be.
Since C₆H₁₂O₆ is a molecule, it will not break apart and there will only be a concentration
of 1.0 m of molecules in solution. It will lower the freezing point less than all the other
choices. There will be fewer "things" in solution and this will lower the freezing point
less than the other choices.
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