UNE GEN CHEM 2 Midterm Newest
Actual Exam Questions And Correct
Answers
An adhesive force
is the result of intermolecular forces that attract different molecules together
Metallic solids
are composed of atoms, with nuclei in a "sea" of delocalized electrons
Acetonitrile, CH3CN, is a common solvent used in organic chemistry labs.
Acetonitrile evaporates very quickly at room temperature and feels noticeably
cold when evaporating. If ΔH vap for acetonitrile is 34.2 kJ/mol, how much
heat is removed when 2.3 g of acetonitrile evaporates?
1.92 kJ
In a pHase diagram, the critical temperature represents
the maximum temperature that a liquid can exist, regardless of pressure
A liquid is most likely to rise in a capillary tube when
,the adhesive forces are stronger than the cohesive forces
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
(m x c x ΔT)water + (n x ΔHvap) + (m x c x ΔT)steam
ΔHvap is
the energy change when a substance changes from liquid pHase to gas pHase
Which of the following will have the strongest dipole-dipole attraction? CCl4,
NCl3, BCl3, Cl2
NCl3
A dispersion force is characterized by
the attraction of temporary dipoles produced by the random asymmetries in
electron motion
Hexane is commonly used in labs as a solvent for nonpolar compounds. What is
the molality of 22.3 mg of Vitamin D (C27H44O, 384.6 g/mol) in 50.0 mL of
hexane. Hexane has a density of 0.661 g/mL.
1.75*10^-3 m
, Which of the following will have the lowest conductivity when dissolved in
water?
0.1 M potassium chloride, KCl
0.1 M sodium sulfate, Na2SO4
0.1 M Calcium nitrate, Ca(NO3)2
0.1 M sucrose, C12H22O11
0.1 M sucrose, C12H22O11
Which Of The Following Is True Of Soaps And Detergents?
-Soaps And Detergents Are Fully HydropHillic, Allowing Them To Easily Dissolve In
Water
-The Hydrocarbon End Of The Soap Or Detergent Orients Toward Water
-The Ionic End In A Soap Or Detergent Molecule Orients Toward A Non-Polar
Molecule
-Many Soap Or Detergent Molecules Surround Non-Polar Substances To Form
Colloidal Particles That Can Be Easily Washed Away
Many Soap Or Detergent Molecules Surround Non-Polar Substances To Form
Colloidal Particles That Can Be Easily Washed Away
Weak Electrolytes
Only Yield A Small Fraction Of Ions In Solution
Actual Exam Questions And Correct
Answers
An adhesive force
is the result of intermolecular forces that attract different molecules together
Metallic solids
are composed of atoms, with nuclei in a "sea" of delocalized electrons
Acetonitrile, CH3CN, is a common solvent used in organic chemistry labs.
Acetonitrile evaporates very quickly at room temperature and feels noticeably
cold when evaporating. If ΔH vap for acetonitrile is 34.2 kJ/mol, how much
heat is removed when 2.3 g of acetonitrile evaporates?
1.92 kJ
In a pHase diagram, the critical temperature represents
the maximum temperature that a liquid can exist, regardless of pressure
A liquid is most likely to rise in a capillary tube when
,the adhesive forces are stronger than the cohesive forces
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
(m x c x ΔT)water + (n x ΔHvap) + (m x c x ΔT)steam
ΔHvap is
the energy change when a substance changes from liquid pHase to gas pHase
Which of the following will have the strongest dipole-dipole attraction? CCl4,
NCl3, BCl3, Cl2
NCl3
A dispersion force is characterized by
the attraction of temporary dipoles produced by the random asymmetries in
electron motion
Hexane is commonly used in labs as a solvent for nonpolar compounds. What is
the molality of 22.3 mg of Vitamin D (C27H44O, 384.6 g/mol) in 50.0 mL of
hexane. Hexane has a density of 0.661 g/mL.
1.75*10^-3 m
, Which of the following will have the lowest conductivity when dissolved in
water?
0.1 M potassium chloride, KCl
0.1 M sodium sulfate, Na2SO4
0.1 M Calcium nitrate, Ca(NO3)2
0.1 M sucrose, C12H22O11
0.1 M sucrose, C12H22O11
Which Of The Following Is True Of Soaps And Detergents?
-Soaps And Detergents Are Fully HydropHillic, Allowing Them To Easily Dissolve In
Water
-The Hydrocarbon End Of The Soap Or Detergent Orients Toward Water
-The Ionic End In A Soap Or Detergent Molecule Orients Toward A Non-Polar
Molecule
-Many Soap Or Detergent Molecules Surround Non-Polar Substances To Form
Colloidal Particles That Can Be Easily Washed Away
Many Soap Or Detergent Molecules Surround Non-Polar Substances To Form
Colloidal Particles That Can Be Easily Washed Away
Weak Electrolytes
Only Yield A Small Fraction Of Ions In Solution
