CHEM 219 MODULE 7 EXAM REVIEW SOLVED QUESTIONS COMPLETE ANSWERS
GRADED A PLUS
CHEM219 Module 7 2026/2027 Examprep Practice
SET Solution Questions and Answers Verified
Solutions Latest Update
Question:
nm to m or m to nm.
Answer:
1 m / 10^9 nm or 10^9 nm / 1 m
Question:
What is the maximum number of electrons that can have the quantum numbers n = 3, ■ = 2, m■ =
-2.
Answer:
The Pauli exclusion principle states that no two electrons in a given atom can share the same set of
four quantum numbers (n, ■, m■, 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.
Question:
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.
Question:
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.
Question:
What is the definition of a natural law?
Answer:
A scientific law summarizes an observable behavior.
Question:
The skeletal structure of a complex organic molecule is shown below. Determine the number of
sigma (σ) and pi (π) bonds in the molecule.
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.
Question:
strontium phosphate.
Answer:
Sr■(PO■)■
Question:
Which of the following statements 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. 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.
, Question:
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 C■H■■O■ D) 1.0 m CaCl2.
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 CaCl■ 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.
Question:
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 C■H■■O■ 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 C■H■■O■ 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.
Question:
isoelectronic ions.
Answer:
ions containing the same number of electrons
Question:
Which of the following bonds is the most polar?
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.
GRADED A PLUS
CHEM219 Module 7 2026/2027 Examprep Practice
SET Solution Questions and Answers Verified
Solutions Latest Update
Question:
nm to m or m to nm.
Answer:
1 m / 10^9 nm or 10^9 nm / 1 m
Question:
What is the maximum number of electrons that can have the quantum numbers n = 3, ■ = 2, m■ =
-2.
Answer:
The Pauli exclusion principle states that no two electrons in a given atom can share the same set of
four quantum numbers (n, ■, m■, 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.
Question:
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.
Question:
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.
Question:
What is the definition of a natural law?
Answer:
A scientific law summarizes an observable behavior.
Question:
The skeletal structure of a complex organic molecule is shown below. Determine the number of
sigma (σ) and pi (π) bonds in the molecule.
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.
Question:
strontium phosphate.
Answer:
Sr■(PO■)■
Question:
Which of the following statements 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. 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.
, Question:
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 C■H■■O■ D) 1.0 m CaCl2.
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 CaCl■ 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.
Question:
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 C■H■■O■ 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 C■H■■O■ 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.
Question:
isoelectronic ions.
Answer:
ions containing the same number of electrons
Question:
Which of the following bonds is the most polar?
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.
