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Final Exam CHEM 219 Questions and
Correct Answers/ Latest Update / Already
Graded
The speed of a wave (c) is the product of its frequency (ν) and
wavelength (λ).
Ans: E = hv = h x c / λ
nm to m
or
m to nm
Ans: 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?
Ans: 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
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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
Ans: 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) _________.
Ans: 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?
Ans: 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.
Ans: 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.
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strontium phosphate
Ans: Sr₃(PO₄)₂
Which of the following statements is true?
Ans: 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
Ans: The dissolved solute will raise the boiling point. The more
"things" that are dissolved (ions or molecules), the higher the
All rights reserved © 2025/ 2026 |
Final Exam CHEM 219 Questions and
Correct Answers/ Latest Update / Already
Graded
The speed of a wave (c) is the product of its frequency (ν) and
wavelength (λ).
Ans: E = hv = h x c / λ
nm to m
or
m to nm
Ans: 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?
Ans: 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
All rights reserved © 2025/ 2026 |
, Page |2
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
Ans: 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) _________.
Ans: 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?
Ans: 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.
Ans: 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.
All rights reserved © 2025/ 2026 |
, Page |3
strontium phosphate
Ans: Sr₃(PO₄)₂
Which of the following statements is true?
Ans: 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
Ans: The dissolved solute will raise the boiling point. The more
"things" that are dissolved (ions or molecules), the higher the
All rights reserved © 2025/ 2026 |
