CHEM 1011 MIDTERM ASSESSMENT SCRIPT
2026 VERIFIED ANSWERS COMPREHENSIVE
REVIEW
◉ how does temperature affect viscosity.
Answer: as we increase temperature, molecules move mroe rapidly
and their kinetic energies are better to overcome the forces that hold
them together (can move past each other more easily) = DECREASES
viscosity
◉ cohesive forces.
Answer: intermolecular forces that bind similar molecules to one
another ;
the molecules WITHIN a liquid are surrounded by other molecules
and are attracted EQUALLY in all directions by the cohesive forces
within a liquid
◉ What causes the spherical shape in liquids.
Answer: molecules on the surface of a liquid are attracted to half as
many molecules so these unbalanced molecular attractions on the
surface cause liquids to contract to form a shape with minimum
surface area = SPHERICAL shape
, ◉ surface tension.
Answer: the energy required to increase the surface area of a liquid
or the force required to increase the length of a liquid surface by a
given amount
=the result of cohesive forces between molecules at the surface of a
liquid
=water a HIGH surface tension due to strong H bonds between its
molecules
◉ Adhesive forces.
Answer: intermolecular forces between unlike (or different)
molecules
ex. water & plastics = weak adhesive force compares to cohesive
forces between water molecules (a drop forms)
ex. water & glass = water spreads out on glass since adhesive forces
between water and glass are greater than the cohesive forces within
water
◉ capillary action.
Answer: when a liquid flows through a porous material due to
attraction of the liquid molecules to the suraface of the material and
to other liquid molecules
=> the adhesive forces between the liquid and the material PLUS the
cohesive forces within the liquid are strong enough to move the
liquid upward against gravity
2026 VERIFIED ANSWERS COMPREHENSIVE
REVIEW
◉ how does temperature affect viscosity.
Answer: as we increase temperature, molecules move mroe rapidly
and their kinetic energies are better to overcome the forces that hold
them together (can move past each other more easily) = DECREASES
viscosity
◉ cohesive forces.
Answer: intermolecular forces that bind similar molecules to one
another ;
the molecules WITHIN a liquid are surrounded by other molecules
and are attracted EQUALLY in all directions by the cohesive forces
within a liquid
◉ What causes the spherical shape in liquids.
Answer: molecules on the surface of a liquid are attracted to half as
many molecules so these unbalanced molecular attractions on the
surface cause liquids to contract to form a shape with minimum
surface area = SPHERICAL shape
, ◉ surface tension.
Answer: the energy required to increase the surface area of a liquid
or the force required to increase the length of a liquid surface by a
given amount
=the result of cohesive forces between molecules at the surface of a
liquid
=water a HIGH surface tension due to strong H bonds between its
molecules
◉ Adhesive forces.
Answer: intermolecular forces between unlike (or different)
molecules
ex. water & plastics = weak adhesive force compares to cohesive
forces between water molecules (a drop forms)
ex. water & glass = water spreads out on glass since adhesive forces
between water and glass are greater than the cohesive forces within
water
◉ capillary action.
Answer: when a liquid flows through a porous material due to
attraction of the liquid molecules to the suraface of the material and
to other liquid molecules
=> the adhesive forces between the liquid and the material PLUS the
cohesive forces within the liquid are strong enough to move the
liquid upward against gravity
