CHM 142 EXAM LATEST 2026 WITH ACTUAL
QUESTIONS AND VERIFIED CORRECT
ANSWERS GRADED A+
◉20 g
5g
10 g
30 g . Answer: The solubility of solids is affected by temperature while
the solubility of gases is affected by both temperature and pressure.
The Solubility of Solids
The solubility of a solid solute increases with increasing temperature
because the thermal energy helps to overcome the attractions between
solute molecules in the solid.
The Solubility of Gases
The solubility of a gaseous solute decreases with increasing temperature
because the thermal energy helps to overcome the attractions between
solute and solvent molecules. The solubility of a gaseous solute
increases as pressure of the solute gas above the solution is increased
,because a higher pressure means that more gas molecules are present
near the surface of the solution and able to dissolve.
How much KNO3 can dissolve in 50 g of water at 10 °C?
◉CH3OH (methanol, polar)
BF3 (Boron trifluoride, nonpolar)
CCl4 (carbon tetrachloride, nonpolar)
C4H10 (butane, nonpolar) . Answer: There must be a strong attraction
between the solute and the solvent molecules in order for the solute to
dissolve in the solvent allowing a solution to form.
Which substance will dissolve in water, a polar substance?
◉8.84 g glucose/108.84 g solution
8.84 g glucose/91.16 g solution
8.84 g glucose/100 g solution
, 8.84 g glucose/100 g water . Answer: Which expression is equivalent to
8.84% (m/m) glucose?
◉3.6 °C
-3.6 °C
10.1 °C
-10.1 °C . Answer: Colligative properties of solutions depend only on
the number of particles dissolved in a solvent. The higher the number of
dissolved solute particles, the larger the effect on the boiling point,
melting point, vapor pressure, and osmotic pressure.
What is the freezing point of 0.500 m I2 in cyclohexane (normal
freezing point = 6.55 °C)? Kf,cyclohexane = 20.2 °C/m
◉0.690
0.310
0.136
QUESTIONS AND VERIFIED CORRECT
ANSWERS GRADED A+
◉20 g
5g
10 g
30 g . Answer: The solubility of solids is affected by temperature while
the solubility of gases is affected by both temperature and pressure.
The Solubility of Solids
The solubility of a solid solute increases with increasing temperature
because the thermal energy helps to overcome the attractions between
solute molecules in the solid.
The Solubility of Gases
The solubility of a gaseous solute decreases with increasing temperature
because the thermal energy helps to overcome the attractions between
solute and solvent molecules. The solubility of a gaseous solute
increases as pressure of the solute gas above the solution is increased
,because a higher pressure means that more gas molecules are present
near the surface of the solution and able to dissolve.
How much KNO3 can dissolve in 50 g of water at 10 °C?
◉CH3OH (methanol, polar)
BF3 (Boron trifluoride, nonpolar)
CCl4 (carbon tetrachloride, nonpolar)
C4H10 (butane, nonpolar) . Answer: There must be a strong attraction
between the solute and the solvent molecules in order for the solute to
dissolve in the solvent allowing a solution to form.
Which substance will dissolve in water, a polar substance?
◉8.84 g glucose/108.84 g solution
8.84 g glucose/91.16 g solution
8.84 g glucose/100 g solution
, 8.84 g glucose/100 g water . Answer: Which expression is equivalent to
8.84% (m/m) glucose?
◉3.6 °C
-3.6 °C
10.1 °C
-10.1 °C . Answer: Colligative properties of solutions depend only on
the number of particles dissolved in a solvent. The higher the number of
dissolved solute particles, the larger the effect on the boiling point,
melting point, vapor pressure, and osmotic pressure.
What is the freezing point of 0.500 m I2 in cyclohexane (normal
freezing point = 6.55 °C)? Kf,cyclohexane = 20.2 °C/m
◉0.690
0.310
0.136
