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CHEM103 - Module 6 Questions and
Correct Answers/ Latest Update / Already
Graded
Why are liquids the least common state of matter?
Ans: they can exist only within a relatively narrow range of
temperatures and pressures
Differentiate between evaporation and vaporization.
Ans: Vaporization is the conversion of liquid particle s to vapor
at the boiling point temperature of the material. The process of
liquid converting to vapor molecules can also take place in a
very limited manner at temperatures lower than the boiling
point and is called evaporation.
Explain why the vapor pressure of a liquid increases with increasing
temperature.
Ans: Water molecules in the liquid state freely vibrate and
rotate. As the temperature rises, the vibrations and rotations
become intense enough to overcome the forces that keep the
molecules together. The molecules begin to undergo
translational motion allowing the molecules to convert to the
vapor state and these exert a pressure above the still -existing
liquid molecules called the vapor pressure of the substance.
All rights reserved © 2025/ 2026 |
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Higher temperature = greater conversion to vapor = higher
vapor pressure.
Explain water's concave meniscus in terms of cohesive and adhesive
forces.
Ans: Cohesive forces are the attractions between particles of
the same type, such as the bonds between water molecules
whereas adhesive forces are attractions between a particle of
one type and particles of a different type, such as the bonds
between water molecule and those of its glass container. These
cohesive and adhesive forces combine to cause liquids to form a
meniscus (curved surface) in a glass tube. A liquid with strong
cohesive forces, such as water, tries to roll itself into a ball to
minimize surface tension, but water is also attracted to the
walls of any tube by adhesive forces, causing the water to form
a concave meniscus.
Why does diffusion take place quickly in a gas, more slowly in a liquid
and not at all in a solid?
Ans: Diffusion is the non-energy-requiring movement of
particles from regions of higher concentration to regions of
lower concentration. Diffusion in a liquid occurs more slowly
than in a gas since the gas particles are moving more rapidly.
Solids do not show the property of diffusion since the particles
All rights reserved © 2025/ 2026 |
CHEM103 - Module 6 Questions and
Correct Answers/ Latest Update / Already
Graded
Why are liquids the least common state of matter?
Ans: they can exist only within a relatively narrow range of
temperatures and pressures
Differentiate between evaporation and vaporization.
Ans: Vaporization is the conversion of liquid particle s to vapor
at the boiling point temperature of the material. The process of
liquid converting to vapor molecules can also take place in a
very limited manner at temperatures lower than the boiling
point and is called evaporation.
Explain why the vapor pressure of a liquid increases with increasing
temperature.
Ans: Water molecules in the liquid state freely vibrate and
rotate. As the temperature rises, the vibrations and rotations
become intense enough to overcome the forces that keep the
molecules together. The molecules begin to undergo
translational motion allowing the molecules to convert to the
vapor state and these exert a pressure above the still -existing
liquid molecules called the vapor pressure of the substance.
All rights reserved © 2025/ 2026 |
, Page |2
Higher temperature = greater conversion to vapor = higher
vapor pressure.
Explain water's concave meniscus in terms of cohesive and adhesive
forces.
Ans: Cohesive forces are the attractions between particles of
the same type, such as the bonds between water molecules
whereas adhesive forces are attractions between a particle of
one type and particles of a different type, such as the bonds
between water molecule and those of its glass container. These
cohesive and adhesive forces combine to cause liquids to form a
meniscus (curved surface) in a glass tube. A liquid with strong
cohesive forces, such as water, tries to roll itself into a ball to
minimize surface tension, but water is also attracted to the
walls of any tube by adhesive forces, causing the water to form
a concave meniscus.
Why does diffusion take place quickly in a gas, more slowly in a liquid
and not at all in a solid?
Ans: Diffusion is the non-energy-requiring movement of
particles from regions of higher concentration to regions of
lower concentration. Diffusion in a liquid occurs more slowly
than in a gas since the gas particles are moving more rapidly.
Solids do not show the property of diffusion since the particles
All rights reserved © 2025/ 2026 |
