MSU CEM 142 FINAL PREP EXAM
QUESTIONS AND ANSWERS 2026
VERIFIED.
A beaker of water is heated from 80C to 110C. What is true about this process?
I. Covalent bonds are broken
II. Covalent bonds are formed
III. Intermolecular forces are overcome
IV. Intermolecular forces are formed. - ANS III. Intermolecular forces are overcome.
Which one of the following substances would you expect to have the highest boiling point?
A. CH3OH
B. OF2
C.CH4
D. CH3OCH3 - ANS A.CH3OH
Which of the following systems will have higher entropy after mixing:
I. 2 dye molecules and 2 water molecules
II. 1 dye molecule and 3 water molecules
A. I. bc there are fewer possible arrangements of I than II after mixing.
B. II. bc there are fewer possible arrangements of II than I after mixing
C. I bc there are more possible arrangements of I than II after mixing
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,D. II bc there are more possible arangements of II than I after mixing - ANS C. I bc there are
more possible arrangements of I than II after mixing
An Aqueous solution A is prepared by dissolving .1 mol potassium chloride (KCl) and .1 mol
Sodium nitrate (NaNO3) in water to make 1.0 L of solution. An aqueous solution B is prepared
by dissolving .1 mol potassium nitrate (KNO3) and .1 mol sodium chloride (NaCl) in water to
make 1.0 L of solution. Which statement is true?
A. Solution A and B are identical
B. Solution A will conduct electricity and Solution B will not
C. The total ion concentration in solution B is greater than the total ion [ ] in solution A.
D. Since the molar masses of the salts are different, the solutions are different. - ANS A.
Solution A and B are identical
A solution is prepared by dissolving 3.4 grams of NH3 in enough water to make 2.0 L of solution.
What is the molarity of the solution?
A. .10 M
B. .20 M
C. .59 M
D.1.7 M - ANS A. .10 M
Which of these statements are true about the process of freezing water?
I. Delta S is positive
II. Delta S is negative
III. It is exothermic
IV. It is endothermic - ANS C. II and III
In a sample of HCl, what bonds and interactions would you expect to be present BETWEEN
molecules?
I. London dispersion Forces
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, II. Dipole-Dipole interactions
III. Hydrogen Bonds
IV. Covalent bonds - ANS B. I and II
Which of these statements are true about the energy changes during bond formation and bond
breaking?
I.Bond breaking releases energy to the surroundings
II. Bond breaking absorbs energy from the surroundings
III. Bond formation releases energy to the surroundings
IV. Bond formation absorbs energy from the surroundings - ANS C. II and III
Federal regulations limit the [ ] of Lead (Pb) in drinking water to 15 ppb. Recently, scientists
from Virginia tech reported some water samples of drinking water in Flint, MI had lead levels of
6.4 x 10^-5 M. What is the concentration of lead in this water sample using units of parts per
billion? ( ppb?)
A. .0132 ppb
B. 64 ppb
C. 6400 ppb
D. 13200 ppb - ANS D. 13200 ppb
What is the evidence that dissolving NaCl in water is an endothermic process?
A. The solute- solvent interactions are stronger than the solvent- solvent and solute- solute
interactions
B. The solvent-solvent and solute-solute interactions are stronger than the solute-solvent
interactions
C. The temperature of the solution increases
D. The temperature of the solution decreases - ANS D. The temperature of the solution
decreases
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QUESTIONS AND ANSWERS 2026
VERIFIED.
A beaker of water is heated from 80C to 110C. What is true about this process?
I. Covalent bonds are broken
II. Covalent bonds are formed
III. Intermolecular forces are overcome
IV. Intermolecular forces are formed. - ANS III. Intermolecular forces are overcome.
Which one of the following substances would you expect to have the highest boiling point?
A. CH3OH
B. OF2
C.CH4
D. CH3OCH3 - ANS A.CH3OH
Which of the following systems will have higher entropy after mixing:
I. 2 dye molecules and 2 water molecules
II. 1 dye molecule and 3 water molecules
A. I. bc there are fewer possible arrangements of I than II after mixing.
B. II. bc there are fewer possible arrangements of II than I after mixing
C. I bc there are more possible arrangements of I than II after mixing
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,D. II bc there are more possible arangements of II than I after mixing - ANS C. I bc there are
more possible arrangements of I than II after mixing
An Aqueous solution A is prepared by dissolving .1 mol potassium chloride (KCl) and .1 mol
Sodium nitrate (NaNO3) in water to make 1.0 L of solution. An aqueous solution B is prepared
by dissolving .1 mol potassium nitrate (KNO3) and .1 mol sodium chloride (NaCl) in water to
make 1.0 L of solution. Which statement is true?
A. Solution A and B are identical
B. Solution A will conduct electricity and Solution B will not
C. The total ion concentration in solution B is greater than the total ion [ ] in solution A.
D. Since the molar masses of the salts are different, the solutions are different. - ANS A.
Solution A and B are identical
A solution is prepared by dissolving 3.4 grams of NH3 in enough water to make 2.0 L of solution.
What is the molarity of the solution?
A. .10 M
B. .20 M
C. .59 M
D.1.7 M - ANS A. .10 M
Which of these statements are true about the process of freezing water?
I. Delta S is positive
II. Delta S is negative
III. It is exothermic
IV. It is endothermic - ANS C. II and III
In a sample of HCl, what bonds and interactions would you expect to be present BETWEEN
molecules?
I. London dispersion Forces
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, II. Dipole-Dipole interactions
III. Hydrogen Bonds
IV. Covalent bonds - ANS B. I and II
Which of these statements are true about the energy changes during bond formation and bond
breaking?
I.Bond breaking releases energy to the surroundings
II. Bond breaking absorbs energy from the surroundings
III. Bond formation releases energy to the surroundings
IV. Bond formation absorbs energy from the surroundings - ANS C. II and III
Federal regulations limit the [ ] of Lead (Pb) in drinking water to 15 ppb. Recently, scientists
from Virginia tech reported some water samples of drinking water in Flint, MI had lead levels of
6.4 x 10^-5 M. What is the concentration of lead in this water sample using units of parts per
billion? ( ppb?)
A. .0132 ppb
B. 64 ppb
C. 6400 ppb
D. 13200 ppb - ANS D. 13200 ppb
What is the evidence that dissolving NaCl in water is an endothermic process?
A. The solute- solvent interactions are stronger than the solvent- solvent and solute- solute
interactions
B. The solvent-solvent and solute-solute interactions are stronger than the solute-solvent
interactions
C. The temperature of the solution increases
D. The temperature of the solution decreases - ANS D. The temperature of the solution
decreases
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