Intermolecular Forces and Phase Diagrams

What explains the very high melting and boiling point of water

• Strong dipole-dipole bonds between water molecules
• Strong hydrogen bonds between water molecules
• Dispersion forces which are present in all molecules
• Asymmetrical shape of the polar bonds.

Does HCl have hydrogen bonding?

• yes
• no

Does CH₄ have hydrogen bonding?

• yes
• no

All molecules have London forces between them, but dipole-dipole and hydrogen bonding are so much stronger that when they are present we can ignore London forces.  Which of these has ONLY London forces?

• I₂
• NH₃
• OCl₂
• SH₂

Which substance would have the weakest intermolecular forces of attraction?

• CH₄

• NaCl

• H₂O

• MgF₂

What is the Strongest Intermolecular force for: NH₃

• Dispersion Force

• Dipole dipole

• Hydrogen bonding

What is the strongest intermolecular force present in HCl?

• dipole dipole

• dispersion

• H-bond

• ionic

Ionic Bonding involves...

• The transfer of protons
• The transfer of nuetrons 
• The transfer of electrons
• None Of the above

Which substance has the weakest intermolecular forces?

• Substance A, boiling point of 75 °C

• Substance B, boiling point of 105 °C

• Substance C, boiling point of 25 °C

• Substance d, boiling point of 45 °C

The weaker the intermolecular forces of a substance the _____________ the boiling point

• higher

• lower