-UNE CHEM 1011 MIDTERM EXAM-
UNE CHEM 1011 Midterm Exam 2026 Latest Update | Comprehensive Practice
Questions, Verified Answers, Detailed Solutions & General Chemistry I Review
Guide | PDF Download
1. A liquid flows through a narrow tube with significant resistance and demonstrates high viscosity. Which
molecular characteristic would most likely explain this property?
A) Low molecular weight and simple structure
B) Complex molecular structure with strong intermolecular forces
C) Nonpolar molecules with weak London dispersion forces
D) Molecules with very low molecular mass and minimal branching
✓ Correct Answer: B) Complex molecular structure with strong intermolecular forces
More structurally complex molecules with stronger intermolecular forces experience greater resistance to flow
because molecules cannot easily move past each other, resulting in higher viscosity measurements.
2. A student observes that water forms spherical droplets on a waxed car surface but spreads evenly on a clean glass
windshield. What explains this difference in behavior?
A) Water has higher density than both wax and glass
B) Adhesive forces between water and glass exceed cohesive forces within water
C) Cohesive forces within water are stronger than adhesive forces with glass
D) The surface tension of water decreases on glass surfaces
✓ Correct Answer: B) Adhesive forces between water and glass exceed cohesive forces within water
,-UNE CHEM 1011 MIDTERM EXAM-
Water spreads on glass because adhesive forces between water molecules and the glass surface are stronger than the
cohesive forces between water molecules, while on wax the cohesive forces dominate, causing droplet formation.
3. What happens to the viscosity of a liquid when its temperature is increased significantly?
A) Viscosity increases due to stronger intermolecular forces
B) Viscosity decreases as molecules gain kinetic energy to overcome attractions
C) Viscosity remains constant regardless of temperature change
D) Viscosity increases because molecules move more rapidly
✓ Correct Answer: B) Viscosity decreases as molecules gain kinetic energy to overcome attractions
Increasing temperature provides molecules with greater kinetic energy, enabling them to more easily overcome
intermolecular attractive forces that impede flow, thereby decreasing the liquid's viscosity.
4. A gas dissolves in a liquid solvent. According to Henry's Law, how would increasing the partial pressure of this
gas affect its solubility?
A) Solubility would decrease proportionally
B) Solubility would increase proportionally
C) Solubility would remain unchanged
D) Solubility would increase exponentially
✓ Correct Answer: B) Solubility would increase proportionally
,-UNE CHEM 1011 MIDTERM EXAM-
Henry's Law states that gas solubility is directly proportional to its partial pressure above the solution, meaning
increasing pressure forces more gas molecules into the liquid phase until equilibrium is established.
5. A solution containing 2.5 moles of solute in 0.500 kg of solvent has which molality?
A) 1.25 mol/kg
B) 2.50 mol/kg
C) 5.00 mol/kg
D) 0.500 mol/kg
✓ Correct Answer: C) 5.00 mol/kg
Molality is calculated as moles of solute divided by mass of solvent in kilograms, giving 2.5 moles ÷ 0.500 kg = 5.00
mol/kg, which is a concentration unit independent of temperature variations.
6. A drop of liquid forms a nearly perfect sphere when placed on a nonstick surface. This shape results primarily
from which phenomenon?
A) Adhesive forces between liquid and surface
B) Cohesive forces causing minimum surface area
C) Gravitational forces pulling the liquid downward
D) Capillary action drawing liquid inward
✓ Correct Answer: B) Cohesive forces causing minimum surface area
, -UNE CHEM 1011 MIDTERM EXAM-
Liquids form spherical shapes because molecules on the surface experience unbalanced attractions inward, creating
surface tension that contracts the liquid to the minimum surface area for a given volume, which is a sphere.
7. Which of the following correctly describes the particles in a solid state?
A) Widely spaced with random movement and frequent collisions
B) Closely packed with regular arrangement and minimal movement
C) Close together with no regular pattern but able to flow past each other
D) Far apart with no regular arrangement and independent movement
✓ Correct Answer: B) Closely packed with regular arrangement and minimal movement
Solid particles are tightly packed in a regular, repeating pattern and maintain fixed positions relative to each other,
only vibrating slightly rather than moving past one another like in liquids or gases.
8. A student calculates that the osmotic pressure of a solution is 0.82 atm at 25°C. If the solution has a molarity of
0.0335 M, which gas constant value was used in this calculation?
A) 0.08206 L•atm/mol•K
B) 8.314 J/mol•K
C) 62.36 L•torr/mol•K
D) 1.987 cal/mol•K
✓ Correct Answer: A) 0.08206 L•atm/mol•K
UNE CHEM 1011 Midterm Exam 2026 Latest Update | Comprehensive Practice
Questions, Verified Answers, Detailed Solutions & General Chemistry I Review
Guide | PDF Download
1. A liquid flows through a narrow tube with significant resistance and demonstrates high viscosity. Which
molecular characteristic would most likely explain this property?
A) Low molecular weight and simple structure
B) Complex molecular structure with strong intermolecular forces
C) Nonpolar molecules with weak London dispersion forces
D) Molecules with very low molecular mass and minimal branching
✓ Correct Answer: B) Complex molecular structure with strong intermolecular forces
More structurally complex molecules with stronger intermolecular forces experience greater resistance to flow
because molecules cannot easily move past each other, resulting in higher viscosity measurements.
2. A student observes that water forms spherical droplets on a waxed car surface but spreads evenly on a clean glass
windshield. What explains this difference in behavior?
A) Water has higher density than both wax and glass
B) Adhesive forces between water and glass exceed cohesive forces within water
C) Cohesive forces within water are stronger than adhesive forces with glass
D) The surface tension of water decreases on glass surfaces
✓ Correct Answer: B) Adhesive forces between water and glass exceed cohesive forces within water
,-UNE CHEM 1011 MIDTERM EXAM-
Water spreads on glass because adhesive forces between water molecules and the glass surface are stronger than the
cohesive forces between water molecules, while on wax the cohesive forces dominate, causing droplet formation.
3. What happens to the viscosity of a liquid when its temperature is increased significantly?
A) Viscosity increases due to stronger intermolecular forces
B) Viscosity decreases as molecules gain kinetic energy to overcome attractions
C) Viscosity remains constant regardless of temperature change
D) Viscosity increases because molecules move more rapidly
✓ Correct Answer: B) Viscosity decreases as molecules gain kinetic energy to overcome attractions
Increasing temperature provides molecules with greater kinetic energy, enabling them to more easily overcome
intermolecular attractive forces that impede flow, thereby decreasing the liquid's viscosity.
4. A gas dissolves in a liquid solvent. According to Henry's Law, how would increasing the partial pressure of this
gas affect its solubility?
A) Solubility would decrease proportionally
B) Solubility would increase proportionally
C) Solubility would remain unchanged
D) Solubility would increase exponentially
✓ Correct Answer: B) Solubility would increase proportionally
,-UNE CHEM 1011 MIDTERM EXAM-
Henry's Law states that gas solubility is directly proportional to its partial pressure above the solution, meaning
increasing pressure forces more gas molecules into the liquid phase until equilibrium is established.
5. A solution containing 2.5 moles of solute in 0.500 kg of solvent has which molality?
A) 1.25 mol/kg
B) 2.50 mol/kg
C) 5.00 mol/kg
D) 0.500 mol/kg
✓ Correct Answer: C) 5.00 mol/kg
Molality is calculated as moles of solute divided by mass of solvent in kilograms, giving 2.5 moles ÷ 0.500 kg = 5.00
mol/kg, which is a concentration unit independent of temperature variations.
6. A drop of liquid forms a nearly perfect sphere when placed on a nonstick surface. This shape results primarily
from which phenomenon?
A) Adhesive forces between liquid and surface
B) Cohesive forces causing minimum surface area
C) Gravitational forces pulling the liquid downward
D) Capillary action drawing liquid inward
✓ Correct Answer: B) Cohesive forces causing minimum surface area
, -UNE CHEM 1011 MIDTERM EXAM-
Liquids form spherical shapes because molecules on the surface experience unbalanced attractions inward, creating
surface tension that contracts the liquid to the minimum surface area for a given volume, which is a sphere.
7. Which of the following correctly describes the particles in a solid state?
A) Widely spaced with random movement and frequent collisions
B) Closely packed with regular arrangement and minimal movement
C) Close together with no regular pattern but able to flow past each other
D) Far apart with no regular arrangement and independent movement
✓ Correct Answer: B) Closely packed with regular arrangement and minimal movement
Solid particles are tightly packed in a regular, repeating pattern and maintain fixed positions relative to each other,
only vibrating slightly rather than moving past one another like in liquids or gases.
8. A student calculates that the osmotic pressure of a solution is 0.82 atm at 25°C. If the solution has a molarity of
0.0335 M, which gas constant value was used in this calculation?
A) 0.08206 L•atm/mol•K
B) 8.314 J/mol•K
C) 62.36 L•torr/mol•K
D) 1.987 cal/mol•K
✓ Correct Answer: A) 0.08206 L•atm/mol•K
