UNE CHEM Midterm WITH QUESTIONS
AND WELL ELABORATED ANSWERS
2026!!
A dispersion force is characterized by - ANSWER☑️⭐-The attraction of temporary dipoles produced by
random asymmetries in electron motion
Which of the following will have the strongest dipole-dipole attractions? - ANSWER☑️⭐-NCl3
An adhesive force - ANSWER☑️⭐-Is the result of the intermolecular forces that attract different
molecules together
Liquids will high surface tension must have - ANSWER☑️⭐-Strong cohesive forces
ΔHsub is - ANSWER☑️⭐-The energy change when a substance changes from the solid phase directly to
the gas phase
The correct expression to calculate the heat required to convert 100g of ice starting at -12 °C to liquid
water at a final temperature of 85 °C is - ANSWER☑️⭐-(m x c x ΔT)ice + (n x ΔHfus) + (m x c x ΔT)water
In a phase diagram, the critical temperature represents - ANSWER☑️⭐-The maximum temperature that
a liquid can exist, regardless of pressure
In the phase diagram determine the state of CO2 at 25 °C and 250 kPa - ANSWER☑️⭐-Gas
, Covalent network solids - ANSWER☑️⭐-Are composed of atom held together by a repeating network of
covalent bonds
Methanol, CH3OH, is a common solvent used in organic chemistry labs. Methanol evaporates very
quickly at room temperature and feels noticeably cold when evaporating. If the ΔHvap for methanol is
37.5 kJ/mol, how much heat is removed when 1.1 g of methanol evaporates? - ANSWER☑️⭐-1.29 kJ
A hydrogen bond is characterized by - ANSWER☑️⭐-The highly concentrated partial charge between an
H atom and F, O, or N atoms
Which of the following hydrocarbons will have the strongest dispersion forces? - ANSWER☑️⭐-n-octane,
CH3CH2CH2CH2CH2CH2CH2CH3
A cohesive force - ANSWER☑️⭐-Is the result of the intermolecular forces that attract identical molecules
A liquid in a tube will form a convex meniscus when - ANSWER☑️⭐-The cohesive forces are stronger
than the adhesive forces
ΔHfus is - ANSWER☑️⭐-The energy change when a substances changes from the solid phase to the
liquid phase
The correct expression to calculate the heat required to convert 100 g of liquid water starting at 12 °C to
steam at a final temperature of 135 °C is - ANSWER☑️⭐-(m x c x ΔT)water + (n x ΔHvap) + (m x c x
ΔT)steam
In a phase diagram, the triple point represents - ANSWER☑️⭐-The temperature and pressure when gas,
liquid, and solid phases coexist
In the phase diagram, determine the state of CO2 at -75 °C and 900 kPa - ANSWER☑️⭐-Solid
Metallic solids - ANSWER☑️⭐-Are composed of atoms, with nuclei in a "sea" of delocalized electrons
AND WELL ELABORATED ANSWERS
2026!!
A dispersion force is characterized by - ANSWER☑️⭐-The attraction of temporary dipoles produced by
random asymmetries in electron motion
Which of the following will have the strongest dipole-dipole attractions? - ANSWER☑️⭐-NCl3
An adhesive force - ANSWER☑️⭐-Is the result of the intermolecular forces that attract different
molecules together
Liquids will high surface tension must have - ANSWER☑️⭐-Strong cohesive forces
ΔHsub is - ANSWER☑️⭐-The energy change when a substance changes from the solid phase directly to
the gas phase
The correct expression to calculate the heat required to convert 100g of ice starting at -12 °C to liquid
water at a final temperature of 85 °C is - ANSWER☑️⭐-(m x c x ΔT)ice + (n x ΔHfus) + (m x c x ΔT)water
In a phase diagram, the critical temperature represents - ANSWER☑️⭐-The maximum temperature that
a liquid can exist, regardless of pressure
In the phase diagram determine the state of CO2 at 25 °C and 250 kPa - ANSWER☑️⭐-Gas
, Covalent network solids - ANSWER☑️⭐-Are composed of atom held together by a repeating network of
covalent bonds
Methanol, CH3OH, is a common solvent used in organic chemistry labs. Methanol evaporates very
quickly at room temperature and feels noticeably cold when evaporating. If the ΔHvap for methanol is
37.5 kJ/mol, how much heat is removed when 1.1 g of methanol evaporates? - ANSWER☑️⭐-1.29 kJ
A hydrogen bond is characterized by - ANSWER☑️⭐-The highly concentrated partial charge between an
H atom and F, O, or N atoms
Which of the following hydrocarbons will have the strongest dispersion forces? - ANSWER☑️⭐-n-octane,
CH3CH2CH2CH2CH2CH2CH2CH3
A cohesive force - ANSWER☑️⭐-Is the result of the intermolecular forces that attract identical molecules
A liquid in a tube will form a convex meniscus when - ANSWER☑️⭐-The cohesive forces are stronger
than the adhesive forces
ΔHfus is - ANSWER☑️⭐-The energy change when a substances changes from the solid phase to the
liquid phase
The correct expression to calculate the heat required to convert 100 g of liquid water starting at 12 °C to
steam at a final temperature of 135 °C is - ANSWER☑️⭐-(m x c x ΔT)water + (n x ΔHvap) + (m x c x
ΔT)steam
In a phase diagram, the triple point represents - ANSWER☑️⭐-The temperature and pressure when gas,
liquid, and solid phases coexist
In the phase diagram, determine the state of CO2 at -75 °C and 900 kPa - ANSWER☑️⭐-Solid
Metallic solids - ANSWER☑️⭐-Are composed of atoms, with nuclei in a "sea" of delocalized electrons
