UNE - Chem 1011 - Midterm Study Guide
1. A hydrogen bond is characterized by C. the highly concentrated partial
charge between an H atom and F,
A. the attraction of temporary dipoles produced O, or N atoms
by the random asymmetries in electron motion
(Ref: Week 1 Quiz)
B. the electrostatic attraction between the per-
manent dipoles in any polar molecule A. LDF's
C. the highly concentrated partial charge be- B. Dipole-Dipole
tween an H atom and F, O, or N atoms
D. Covalent Bond
D. the covalent sharing of electrons between two
atoms in a molecule
2. Which of the following will have the strongest A. NCl3
dipole-dipole attractions?
(Ref: Week 1 Quiz)
A. NCl3
Asymmetrical - Usually have a high-
B. CCl4 er dipole moment
Why not BCl3? Because Nitrogen is
C. BCl3 more electronegative than Boron.
D. Cl2
3. A cohesive force A. is the result of the intermolecu-
lar forces that attract identical mol-
A. is the result of the intermolecular forces that ecules
attract identical molecules
(Ref: Week 1 Quiz)
B. is the result of the intermolecular forces that
attract different molecules together Easy way to remember. Co = mutual
so cohesive is identical molecules.
C. is the result of covalent interactions between
, UNE - Chem 1011 - Midterm Study Guide
atoms in a molecule
D. is always stronger than an adhesive force
4. ΔHvap is A. the energy change when a sub-
stance changes from the liquid
A. the energy change when a substance changes phase to the gas phase
from the liquid phase to the gas phase
(Ref: Week 1 Quiz)
B. the energy change when a substance changes
from the solid phase to the liquid phase Liquid ’Gas (Vaporization)
Ex: Boiling
C. the energy change when a substance changes
from the liquid phase to the solid phase
D. the energy change when a substance changes
from the solid phase directly to the gas phase
5. A liquid in a tube will form a convex meniscus B. the cohesive forces are stronger
when than the adhesive forces.
A. the adhesive forces are stronger than the co- (Ref: Week 1 Quiz)
hesive forces
B. the cohesive forces are stronger than the ad-
hesive forces
C. the adhesive forces are equal to the cohesive
forces
D. it's impossible to predict
6. In a phase diagram, the critical pressure repre- C. the maximum pressure that a gas
sents can exist
, UNE - Chem 1011 - Midterm Study Guide
A. the temperature and pressure when gas, liq- (Ref: Quiz Week 1)
uid, and solid phases coexist
Key word: pressure, so the answer
B. the maximum temperature that a liquid can is either C or D. We know it isn't D
exist because the critical point of a phase
diagram exists near the supercriti-
C. the maximum pressure that a gas can exist cal fluid area.
D. the minimum pressure that a solid can exist,
regardless of temperature
7. Molecular solids D. are composed of neutral mole-
cules held together by intermolec-
A. are composed of positive and negative ions ular forces
held together by electrostatic attractions
(Ref: Week 1 Quiz)
B. are composed of atoms, with nuclei in a "sea"
of delocalized electrons
C. are composed of atoms held together by a
repeating network of covalent bonds
D. are composed of neutral molecules held to-
gether by intermolecular forces
8. The correct expression to calculate the heat re- A. (m x c x ΔT)ice + (n x ΔHfus) + (m
quired to convert 100 g of ice starting at -12 °C x c x ΔT)water
to liquid water at a final temperature of 85 °C is:
(Ref: Week 1 Quiz)
A. (m x c x ΔT)ice + (n x ΔHfus) + (m x c x ΔT)water
the amount of heat absorbed or re-
1. A hydrogen bond is characterized by C. the highly concentrated partial
charge between an H atom and F,
A. the attraction of temporary dipoles produced O, or N atoms
by the random asymmetries in electron motion
(Ref: Week 1 Quiz)
B. the electrostatic attraction between the per-
manent dipoles in any polar molecule A. LDF's
C. the highly concentrated partial charge be- B. Dipole-Dipole
tween an H atom and F, O, or N atoms
D. Covalent Bond
D. the covalent sharing of electrons between two
atoms in a molecule
2. Which of the following will have the strongest A. NCl3
dipole-dipole attractions?
(Ref: Week 1 Quiz)
A. NCl3
Asymmetrical - Usually have a high-
B. CCl4 er dipole moment
Why not BCl3? Because Nitrogen is
C. BCl3 more electronegative than Boron.
D. Cl2
3. A cohesive force A. is the result of the intermolecu-
lar forces that attract identical mol-
A. is the result of the intermolecular forces that ecules
attract identical molecules
(Ref: Week 1 Quiz)
B. is the result of the intermolecular forces that
attract different molecules together Easy way to remember. Co = mutual
so cohesive is identical molecules.
C. is the result of covalent interactions between
, UNE - Chem 1011 - Midterm Study Guide
atoms in a molecule
D. is always stronger than an adhesive force
4. ΔHvap is A. the energy change when a sub-
stance changes from the liquid
A. the energy change when a substance changes phase to the gas phase
from the liquid phase to the gas phase
(Ref: Week 1 Quiz)
B. the energy change when a substance changes
from the solid phase to the liquid phase Liquid ’Gas (Vaporization)
Ex: Boiling
C. the energy change when a substance changes
from the liquid phase to the solid phase
D. the energy change when a substance changes
from the solid phase directly to the gas phase
5. A liquid in a tube will form a convex meniscus B. the cohesive forces are stronger
when than the adhesive forces.
A. the adhesive forces are stronger than the co- (Ref: Week 1 Quiz)
hesive forces
B. the cohesive forces are stronger than the ad-
hesive forces
C. the adhesive forces are equal to the cohesive
forces
D. it's impossible to predict
6. In a phase diagram, the critical pressure repre- C. the maximum pressure that a gas
sents can exist
, UNE - Chem 1011 - Midterm Study Guide
A. the temperature and pressure when gas, liq- (Ref: Quiz Week 1)
uid, and solid phases coexist
Key word: pressure, so the answer
B. the maximum temperature that a liquid can is either C or D. We know it isn't D
exist because the critical point of a phase
diagram exists near the supercriti-
C. the maximum pressure that a gas can exist cal fluid area.
D. the minimum pressure that a solid can exist,
regardless of temperature
7. Molecular solids D. are composed of neutral mole-
cules held together by intermolec-
A. are composed of positive and negative ions ular forces
held together by electrostatic attractions
(Ref: Week 1 Quiz)
B. are composed of atoms, with nuclei in a "sea"
of delocalized electrons
C. are composed of atoms held together by a
repeating network of covalent bonds
D. are composed of neutral molecules held to-
gether by intermolecular forces
8. The correct expression to calculate the heat re- A. (m x c x ΔT)ice + (n x ΔHfus) + (m
quired to convert 100 g of ice starting at -12 °C x c x ΔT)water
to liquid water at a final temperature of 85 °C is:
(Ref: Week 1 Quiz)
A. (m x c x ΔT)ice + (n x ΔHfus) + (m x c x ΔT)water
the amount of heat absorbed or re-
