chem 8.1

What type of bond is KCl?

Ionic bonds

What type of bond is BCl3

Polar covalent

What type of bond is P4

Nonpolar covalent bond

What type of bond is Br2

Nonpolar covalent bond

Order K, N, Ga, Cs, and F from most to least electronegative?

F, N, Ga, K, Cs

Which is more electronegative? F or P

F

Which is more electronegative? O or Se

O

Which is more electronegative? Si or N

N

Which is more electronegative? Li or Be

Be

Which bond is most electronegative?

C-O

Which direction does the polarity go for each of these bonds? Br - Br, H - Cl, F - CH3

No polarity. Towards the Cl, towards the F

Induced dipoles are?

Weak

How long to induced dipoles last?

Very short-lived

The XeCl4 molecule is? Polar or nonpolar?

Nonpolar

Where is the negative pole on each of these molecules?

Between the F atoms

Where is the negative pole on each of these molecules?

Between the O and F atoms

Which molecule should have the highest dipole moment, and why?

COFH because the polar bonds in COF2 nearly cancel each other out

Which of the molecules are polar?

CH2Cl2, PCl3, SO2

Which of the following compounds are polar?

HCl, H2O, CHCl3

Which of these molecules are polar?

CH3F, HF, NH3, H2O

Which substances exhibit only London (dispersion) forces

Cl2 and He

Which of the substances have polar interactions (dipole-dipole forces) between molecules?

NF3 and ClF

Which of these have the highest boiling point, Highest to lowest? CH4, CH3OH, CH3Cl

CH3OH, CH3Cl, CH4

Arrange this intermolecular forces by strength strong to weak. LDF, Dipole-dipole, hydrogen

Hydrogen, dipole-dipole, LDF

Arrange in strength order. Dipole - dipole, hydrogen, ion-ion, dispersion

Which of these are hydrogen bonded

The third one

Which molecules can hydrogen?

HF and CH3OH

What are the boiling points of liquids determined by?

The intermolecular forces that must be energetically overcome for that liquid to convert from a liquid to gas

What is the strongest intermolecular forces to be overcome when ethanol is converted from a liquid to a gas?

Hydrogen bonding

What is the strongest intermolecular force to be overcome when dichloromethane is converted from a liquid to a gas?

Dipole - dipole

Which pair of compounds or ions exhibit an ion-dipole interaction?

CH3OH and Na+

When a question asks to “identify the predominant intermolecular forces in each of these substances” how do you know which are hydrogen vs dipole-dipole

Hydrogen bonding has to have a hydrogen bonded to FONS, while dipole - dipole wont have the H attached

What intermolecular forces does CH3Cl have?

Dipole - dipole and dispersion

Which of the substances have polar interactions? Dipole - dipole

The top two

Which of the choices shows a hydrogen bond?

H3N - - - - H—O—H