Final Exam CHEM 219 Questions With Complete Solutions(Guaranteed Success)RatedA+
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Course
Chem 219
Institution
Chem 219
Final Exam CHEM 219 Questions With Complete Solutions(Guaranteed Success)RatedA+
The speed of a wave (c) is the product of its frequency (ν) and wavelength (λ). - correct answer...E = hv = h x c / λ
nm to m
or
m to nm - correct answer...1 m / 10^9 nm
or
10^9 nm / 1 m
What is the max...
Final Exam CHEM 219 Questions With
Complete Solutions(Guaranteed
Success)RatedA+
The speed of a wave (c) is the product of its frequency (ν) and wavelength (λ). - correct
answer...✔✔E = hv = h x c / λ
nm to m
or
m to nm - correct answer...✔✔1 m / 10^9 nm
or
10^9 nm / 1 m
What is the maximum number of electrons that can have the quantum numbers n = 3, ℓ
= 2, mℓ = -2? - correct answer...✔✔The Pauli exclusion principle states that no two
electrons in a given atom can share the same set of four quantum numbers (n, ℓ, mℓ,
ms). This set of quantum numbers contains three quantum numbers, with the only
missing quantum number being ms, which can take on the values +½ and -½.
Therefore, this set of three quantum numbers represents a single atomic orbital, which
can contain two unique electrons: one with ms = +½ and one with ms = -½.
An exothermic reaction causes the surroundings to - correct 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) _________. - correct 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? - correct answer...✔✔A scientific law
summarizes an observable behavior.
The skeletal structure of a complex organic molecule is shown below. Determine the
number of sigma (σ) and pi (π) bonds in the molecule. - correct answer...✔✔
Remember a single bond = 1 σ; a double bond = 1 σ + 1 π; a triple bond = 1 σ + 2 π.
This molecule contains 6 double bonds, so there are 6σ and 6π. There are 28 single
bonds, so there are 28 σ. This is a total 34σ and 6π.
, Which of the following statements is true? - correct 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. Therefore the tendency to
vaporize is not as great for the solution as it is for the pure liquid, resulting in a lower
vapor pressure for the solution.
Which 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 - correct answer...✔✔The dissolved solute will raise the boiling point.
The more "things" that are dissolved (ions or molecules), the higher the boiling point will
be. The CaCl₂ will break up 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 one 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 - correct 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.
isoelectronic ions - correct answer...✔✔ions containing the same number of electrons
Which of the following bonds is the most polar? - correct answer...✔✔Elements that
are located far away from each other on the periodic table have larger electronegativity
differences and therefore make more polar bonds. Of all the element pairs listed, Rb
and Br are the farthest apart.
Three blocks of the same shape and size are placed in front of you. Block A has a mass
of 3.0 g, block B is 5.0 g, and block C is 10.0 g. Which has the higher density? - correct
answer...✔✔Density is the ratio of mass to volume. Since the volume is constant
between all the blocks, then the block with the highest mass will have the highest
density.
Density equation - correct answer...✔✔mass/volume
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