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CHEM 219 PORTAGE
LEARNING-MODULE 3
QUESTIONS AND CORRECT
ANSWERS (Latest Update
2025) |A+ GRADED.
The speed of a wave (c) is the product of its frequency (ν) and wavelength (λ). - CORRECT
✓✓ E = hv = h x c / λ
nm to m
or
m to nm - CORRECT ✓✓ 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 ✓✓ 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 ✓✓ 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 ✓✓ A theory or model is a well
established explanation of a phenomenon based on a series of facts and a body of evidence.
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What is the definition of a natural law? - CORRECT ✓✓ 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 ✓✓ 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.
strontium phosphate - CORRECT ✓✓ Sr₃(PO₄)₂
Which of the following statements is true? - CORRECT ✓✓ 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 ✓✓ 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
CHEM 219 PORTAGE
LEARNING-MODULE 3
QUESTIONS AND CORRECT
ANSWERS (Latest Update
2025) |A+ GRADED.
The speed of a wave (c) is the product of its frequency (ν) and wavelength (λ). - CORRECT
✓✓ E = hv = h x c / λ
nm to m
or
m to nm - CORRECT ✓✓ 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 ✓✓ 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 ✓✓ 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 ✓✓ A theory or model is a well
established explanation of a phenomenon based on a series of facts and a body of evidence.
, Page |2
What is the definition of a natural law? - CORRECT ✓✓ 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 ✓✓ 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.
strontium phosphate - CORRECT ✓✓ Sr₃(PO₄)₂
Which of the following statements is true? - CORRECT ✓✓ 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 ✓✓ 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
