CHEM 1011 Midterm
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1. A hydrogen bond is characterized by: the highly concentrated
-the attraction of temporary dipoles produced by the partial charge between an
random asymmetries in electron motion H atom and F, O, or N
-the electrostatic attraction between the permanent atoms
dipoles in any polar molecule
-the highly concentrated partial charge between an H
atom and F, O, or N atoms
-the covalent sharing of electrons between two atoms
in a molecule
2. Which of the following exhibits hydrogen bonding? CH3OH
-CH3OH
-HCl
-CH2O
-HCN
3. An adhesive force: is the result of the inter-
-is the result of the intermolecular forces that attract molecular forces that at-
identical molecules tract different molecules
-is the result of the intermolecular forces that attract together
different molecules together
-is the result of covalent interactions between atoms in
a molecule
-is always stronger than a cohesive force
4. A liquid in a tube will form a concave meniscus when: the adhesive forces are
stronger than the cohesive
-the adhesive forces are stronger than the cohesive forces
forces
-the cohesive forces are stronger than the adhesive
forces
, CHEM 1011 Midterm
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-the adhesive forces are equal to the cohesive forces
-it's impossible to predict
5. ΔHvap is: the energy change when
a substance changes from
-the energy change when a substance changes from the liquid phase to the gas
the liquid phase to the gas phase phase
-the energy change when a substance changes from
the solid phase to the liquid phase
-the energy change when a substance changes from
the liquid phase to the solid phase
-the energy change when a substance changes from
the solid phase directly to the gas phase
6. The correct expression to calculate the heat required (m x c x ΔT)ice + (n x ΔHfus)
to convert 100 g of ice starting at -12 °C to liquid water + (m x c x ΔT)water
at a final temperature of 85 °C is:
-(m x c x ΔT)ice + (n x ΔHfus) + (m x c x ΔT)water
-(n x ΔHfus) + (m x c x ΔT)water
-(m x c x ΔT)ice + (m x c x ΔT)water
-(n x ΔHfus)
7. In a phase diagram, the critical temperature repre- -the maximum pressure
sents: that a gas can exist, re-
-the temperature and pressure when gas, liquid, and gardless of temperature
solid phases coexist
-the maximum temperature that a liquid can exist,
regardless of pressure
-the maximum pressure that a gas can exist, regard-
less of temperature
-the minimum pressure that a solid can exist, regard-
less of temperature
, CHEM 1011 Midterm
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8. Determine state of CO2 at 400*C and 300 atm (pic on Supercritical fluid (SCF)
next page)
9. Metallic solids: are composed of atoms,
with nuclei in a "sea" of
-are composed of positive and negative ions held to- delocalized electrons
gether by electrostatic attractions
-are composed of atoms, with nuclei in a "sea" of delo-
calized electrons
-are composed of atoms held together by a repeating
network of covalent bonds
-are composed of neutral molecules held together by
intermolecular forces
10. Acetonitrile, CH3CN, is a common solvent used in 1.92 kJ
organic chemistry labs. Acetonitrile evaporates very
quickly at room temperature and feels noticeably cold
when evaporating. If the ΔHvap for acetonitrile is 34.2
kJ/mol, how much heat is removed when 2.3 g of ace-
tonitrile evaporates?
1.92 kJ
2.76 kJ
3.23 kJ
0.362 kJ
11. A solution is always homogenous
Study online at https://quizlet.com/_j5t48h
1. A hydrogen bond is characterized by: the highly concentrated
-the attraction of temporary dipoles produced by the partial charge between an
random asymmetries in electron motion H atom and F, O, or N
-the electrostatic attraction between the permanent atoms
dipoles in any polar molecule
-the highly concentrated partial charge between an H
atom and F, O, or N atoms
-the covalent sharing of electrons between two atoms
in a molecule
2. Which of the following exhibits hydrogen bonding? CH3OH
-CH3OH
-HCl
-CH2O
-HCN
3. An adhesive force: is the result of the inter-
-is the result of the intermolecular forces that attract molecular forces that at-
identical molecules tract different molecules
-is the result of the intermolecular forces that attract together
different molecules together
-is the result of covalent interactions between atoms in
a molecule
-is always stronger than a cohesive force
4. A liquid in a tube will form a concave meniscus when: the adhesive forces are
stronger than the cohesive
-the adhesive forces are stronger than the cohesive forces
forces
-the cohesive forces are stronger than the adhesive
forces
, CHEM 1011 Midterm
Study online at https://quizlet.com/_j5t48h
-the adhesive forces are equal to the cohesive forces
-it's impossible to predict
5. ΔHvap is: the energy change when
a substance changes from
-the energy change when a substance changes from the liquid phase to the gas
the liquid phase to the gas phase phase
-the energy change when a substance changes from
the solid phase to the liquid phase
-the energy change when a substance changes from
the liquid phase to the solid phase
-the energy change when a substance changes from
the solid phase directly to the gas phase
6. The correct expression to calculate the heat required (m x c x ΔT)ice + (n x ΔHfus)
to convert 100 g of ice starting at -12 °C to liquid water + (m x c x ΔT)water
at a final temperature of 85 °C is:
-(m x c x ΔT)ice + (n x ΔHfus) + (m x c x ΔT)water
-(n x ΔHfus) + (m x c x ΔT)water
-(m x c x ΔT)ice + (m x c x ΔT)water
-(n x ΔHfus)
7. In a phase diagram, the critical temperature repre- -the maximum pressure
sents: that a gas can exist, re-
-the temperature and pressure when gas, liquid, and gardless of temperature
solid phases coexist
-the maximum temperature that a liquid can exist,
regardless of pressure
-the maximum pressure that a gas can exist, regard-
less of temperature
-the minimum pressure that a solid can exist, regard-
less of temperature
, CHEM 1011 Midterm
Study online at https://quizlet.com/_j5t48h
8. Determine state of CO2 at 400*C and 300 atm (pic on Supercritical fluid (SCF)
next page)
9. Metallic solids: are composed of atoms,
with nuclei in a "sea" of
-are composed of positive and negative ions held to- delocalized electrons
gether by electrostatic attractions
-are composed of atoms, with nuclei in a "sea" of delo-
calized electrons
-are composed of atoms held together by a repeating
network of covalent bonds
-are composed of neutral molecules held together by
intermolecular forces
10. Acetonitrile, CH3CN, is a common solvent used in 1.92 kJ
organic chemistry labs. Acetonitrile evaporates very
quickly at room temperature and feels noticeably cold
when evaporating. If the ΔHvap for acetonitrile is 34.2
kJ/mol, how much heat is removed when 2.3 g of ace-
tonitrile evaporates?
1.92 kJ
2.76 kJ
3.23 kJ
0.362 kJ
11. A solution is always homogenous
