A hydrogen bond is characterized by
A. the attraction of temporary dipoles produced by the random asymmetries in electron motion
B. the electrostatic attraction between the permanent dipoles in any polar molecule
C. the highly concentrated partial charge between an H atom and F, O, or N atoms
D. the covalent sharing of electrons between two atoms in a molecule
C. the highly concentrated partial charge between an H atom and F, O, or N atoms
(Ref: Week 1 Quiz)
A. LDF's
B. Dipole-Dipole
D. Covalent Bond
,Which of the following will have the strongest dipole-dipole attractions?
A. NCl3
B. CCl4
C. BCl3
D. Cl2
A. NCl3
(Ref: Week 1 Quiz)
Asymmetrical - Usually have a higher dipole moment
Why not BCl3? Because Nitrogen is more electronegative than Boron.
,A cohesive force
A. is the result of the intermolecular forces that attract identical molecules
B. is the result of the intermolecular forces that attract different molecules together
C. is the result of covalent interactions between atoms in a molecule
D. is always stronger than an adhesive force
A. is the result of the intermolecular forces that attract identical molecules
(Ref: Week 1 Quiz)
Easy way to remember. Co = mutual so cohesive is identical molecules.
, ΔHvap is
A. the energy change when a substance changes from the liquid phase to the gas phase
B. the energy change when a substance changes from the solid phase to the liquid phase
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
A. the energy change when a substance changes from the liquid phase to the gas phase
(Ref: Week 1 Quiz)
Liquid → Gas (Vaporization)
Ex: Boiling
A. the attraction of temporary dipoles produced by the random asymmetries in electron motion
B. the electrostatic attraction between the permanent dipoles in any polar molecule
C. the highly concentrated partial charge between an H atom and F, O, or N atoms
D. the covalent sharing of electrons between two atoms in a molecule
C. the highly concentrated partial charge between an H atom and F, O, or N atoms
(Ref: Week 1 Quiz)
A. LDF's
B. Dipole-Dipole
D. Covalent Bond
,Which of the following will have the strongest dipole-dipole attractions?
A. NCl3
B. CCl4
C. BCl3
D. Cl2
A. NCl3
(Ref: Week 1 Quiz)
Asymmetrical - Usually have a higher dipole moment
Why not BCl3? Because Nitrogen is more electronegative than Boron.
,A cohesive force
A. is the result of the intermolecular forces that attract identical molecules
B. is the result of the intermolecular forces that attract different molecules together
C. is the result of covalent interactions between atoms in a molecule
D. is always stronger than an adhesive force
A. is the result of the intermolecular forces that attract identical molecules
(Ref: Week 1 Quiz)
Easy way to remember. Co = mutual so cohesive is identical molecules.
, ΔHvap is
A. the energy change when a substance changes from the liquid phase to the gas phase
B. the energy change when a substance changes from the solid phase to the liquid phase
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
A. the energy change when a substance changes from the liquid phase to the gas phase
(Ref: Week 1 Quiz)
Liquid → Gas (Vaporization)
Ex: Boiling
