GENERAL CHEMISTRY II MIDTERM
EXAM QUESTIONS AND ANSWERS 100%
PASS
Give the change in condition to go from a liquid to a gas. - ANS increase heat or reduce
pressure
In liquid methanol, CH3OH, which intermolecular forces are present? - ANS dispersion,
hydrogen bonding, and dipole-dipole
The two strands in DNA are held together by - ANS hydrogen bonding
Identify the substance with the highest viscosity. - ANS maple syrup
Choose the substance with the lowest boiling point. - ANS N2
How much energy is required to vaporize 48.7 g of dichloromethane (CH2Cl2) at its boiling
point, if its ΔHvap is 31.6 kJ/mol? - ANS 18.1 kJ
Define sublimation. - ANS the phase transition from solid to gas
The enthalpy change for converting 10.0 g of ice at -50.0°C to water at 70.0°C is ______ kJ. The
specific heats of ice, water, and steam are 2.09 J/gK, 4.18 J/gK, and 1.84 J/gK, respectively. For
H2O, ΔHfus = 6.01 kJ/mol, and ΔHvap = 40.67 kJ/mol. - ANS 7.31
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,On a phase diagram, the sublimation curve is between - ANS a solid and a gas
When two waves interact with their crest and troughs in alignment is called -
ANS constructive interference
Identify for the hexagonal unit cell. - ANS a=b≠c
Rubidium crystallizes in a body-centered cubic structure. What is the coordination number of
each atom? - ANS 8
Which of the following forms a molecular solid? - ANS C10H22
Identify the type of interaction between atoms in a networking solid. - ANS covalent bonding
Identify the compound that has a fluorite structure. - ANS barium chloride
An allotrope of carbon that exists in the shape of a ball containing 36 to 100 carbons is called -
ANS a fullerene
Identify a use for glass. - ANS beakers
Identify the element with the largest band gap. - ANS carbon
A common use for nylon 6,6 is - ANS fishing line
Which of the following represent the addition polymer formed from the compound below?
CH2=CH-CH3 - ANS (CH2-CH)-CH3
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, Identify the compounds that are soluble in both water and hexane. - ANS ethanol and 1-
propanol
Which cation in each set is expected to have the larger (more negative) hydration energy? I
Be2+ or Ca2+ II Rb+ or Zn2+ - ANS Be2+ in set I and Zn2+ in set II
Choose the situation below that would result in an endothermic ΔHsolution. - ANS when
|ΔHsolute| > |ΔHhydration|
Identify the gas that is dissolved in carbonated sodas. - ANS carbon dioxide
Calculate the mass of oxygen (in mg) dissolved in a 5.00 L bucket of water exposed to a pressure
of 1.13 atm of air. Assume the mole fraction of oxygen in air to be 0.21 and the Henry's law
constant for oxygen in water at this temperature to be 1.3 * 10^-3 M/atm. - ANS 49.4 mg
A 1.00 L sample of water contains 0.0048 g of SH- ions. Determine the concentration of SH- ions
in ppm if the density of the solution is 1.00 g/mL. - ANS 4.8 ppm
What is the weight percent of vitamin C in a solution made by dissolving 2.60 g of vitamin C,
C6H8O6, in 55.0 g of water? - ANS 4.51%
A solution is prepared by dissolving 40.0 g of sucrose, C12H22O11, in 250 g of water at 25°C.
What is the vapor pressure of the solution if the vapor pressure of water at 25°C is 23.76 mm
Hg? - ANS 23.6 mm Hg
A solution is prepared by adding 30.00 g of lactose (milk sugar) to 110.0 g of water at 55°C. The
partial pressure of water above the solution is _____ torr. The vapor pressure of pure water at
55°C is 118.0 torr. The molar mass of lactose is 342.3 g/mol. - ANS 116.3
A KCl solution is prepared by dissolving 25.0 g of KCl in 250.0 g of water at 25°C. What is the
vapor pressure of the solution if the vapor pressure of water at 25°C is 23.76 mm Hg? -
ANS 22.7 mm Hg
@COPYRIGHT ALL RIGHTS RESERVED PAGE 3 OF 30
EXAM QUESTIONS AND ANSWERS 100%
PASS
Give the change in condition to go from a liquid to a gas. - ANS increase heat or reduce
pressure
In liquid methanol, CH3OH, which intermolecular forces are present? - ANS dispersion,
hydrogen bonding, and dipole-dipole
The two strands in DNA are held together by - ANS hydrogen bonding
Identify the substance with the highest viscosity. - ANS maple syrup
Choose the substance with the lowest boiling point. - ANS N2
How much energy is required to vaporize 48.7 g of dichloromethane (CH2Cl2) at its boiling
point, if its ΔHvap is 31.6 kJ/mol? - ANS 18.1 kJ
Define sublimation. - ANS the phase transition from solid to gas
The enthalpy change for converting 10.0 g of ice at -50.0°C to water at 70.0°C is ______ kJ. The
specific heats of ice, water, and steam are 2.09 J/gK, 4.18 J/gK, and 1.84 J/gK, respectively. For
H2O, ΔHfus = 6.01 kJ/mol, and ΔHvap = 40.67 kJ/mol. - ANS 7.31
@COPYRIGHT ALL RIGHTS RESERVED PAGE 1 OF 30
,On a phase diagram, the sublimation curve is between - ANS a solid and a gas
When two waves interact with their crest and troughs in alignment is called -
ANS constructive interference
Identify for the hexagonal unit cell. - ANS a=b≠c
Rubidium crystallizes in a body-centered cubic structure. What is the coordination number of
each atom? - ANS 8
Which of the following forms a molecular solid? - ANS C10H22
Identify the type of interaction between atoms in a networking solid. - ANS covalent bonding
Identify the compound that has a fluorite structure. - ANS barium chloride
An allotrope of carbon that exists in the shape of a ball containing 36 to 100 carbons is called -
ANS a fullerene
Identify a use for glass. - ANS beakers
Identify the element with the largest band gap. - ANS carbon
A common use for nylon 6,6 is - ANS fishing line
Which of the following represent the addition polymer formed from the compound below?
CH2=CH-CH3 - ANS (CH2-CH)-CH3
@COPYRIGHT ALL RIGHTS RESERVED PAGE 2 OF 30
, Identify the compounds that are soluble in both water and hexane. - ANS ethanol and 1-
propanol
Which cation in each set is expected to have the larger (more negative) hydration energy? I
Be2+ or Ca2+ II Rb+ or Zn2+ - ANS Be2+ in set I and Zn2+ in set II
Choose the situation below that would result in an endothermic ΔHsolution. - ANS when
|ΔHsolute| > |ΔHhydration|
Identify the gas that is dissolved in carbonated sodas. - ANS carbon dioxide
Calculate the mass of oxygen (in mg) dissolved in a 5.00 L bucket of water exposed to a pressure
of 1.13 atm of air. Assume the mole fraction of oxygen in air to be 0.21 and the Henry's law
constant for oxygen in water at this temperature to be 1.3 * 10^-3 M/atm. - ANS 49.4 mg
A 1.00 L sample of water contains 0.0048 g of SH- ions. Determine the concentration of SH- ions
in ppm if the density of the solution is 1.00 g/mL. - ANS 4.8 ppm
What is the weight percent of vitamin C in a solution made by dissolving 2.60 g of vitamin C,
C6H8O6, in 55.0 g of water? - ANS 4.51%
A solution is prepared by dissolving 40.0 g of sucrose, C12H22O11, in 250 g of water at 25°C.
What is the vapor pressure of the solution if the vapor pressure of water at 25°C is 23.76 mm
Hg? - ANS 23.6 mm Hg
A solution is prepared by adding 30.00 g of lactose (milk sugar) to 110.0 g of water at 55°C. The
partial pressure of water above the solution is _____ torr. The vapor pressure of pure water at
55°C is 118.0 torr. The molar mass of lactose is 342.3 g/mol. - ANS 116.3
A KCl solution is prepared by dissolving 25.0 g of KCl in 250.0 g of water at 25°C. What is the
vapor pressure of the solution if the vapor pressure of water at 25°C is 23.76 mm Hg? -
ANS 22.7 mm Hg
@COPYRIGHT ALL RIGHTS RESERVED PAGE 3 OF 30
