Forces and Geometry

What forces are present?

• LDF

• Dipole-Dipole

• Hydrogen Bond

• Ion-Dipole

What is the geometry around carbon, C?

• linear

• bent

• trigonal pyramidal

• tetrahedral

What forces are present?

• LDF

• Dipole-Dipole

• H-Bond

• Ion-Dipole

What is the geometry around carbon, C?

• linear

• bent

• trigonal planar

• tetrahedral

Why does methanol, CH3OH, have a higher melting point than CO2 in terms of IMFs?

• LDF

• dipole-dipole

• hydrogen bonding

• ion-dipole

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

Intermolecular forces for: NH₃

• Dispersion Force

• Dipole dipole

• Hydrogen bonding

Which substance has the weakest intermolecular forces?

• Substance A, boiling point of 373K

• Substance B, boiling point of 305K

• Substance C, boiling point of 298K

• Substance D, boiling point of 350K