3.4 - Intermolecular forces

Which of the following is an intramolecular bond?

• Covalent bond

• Dispersion force

• Hydrogen bond

• Dipole-dipole attraction

What are dispersion forces?

• The force of attraction between permanent dipoles

• The force of repulsion between molecules when they collide

• The force of attraction created by temporary dipole moments

• The bonding force created by sharing electrons

What is the difference between a hydrogen bond and dipole-dipole attraction?

• They are two phrases that mean the same thing

• Hydrogen bonds are a stronger type of dipole-dipole attraction

• Dipole-dipole attraction is a weaker type of hydrogen bond

• Hydrogen bonds are a type of covalent bond whereas dipole-dipole attraction is an intermolecular force

Which of these molecules do not form hydrogen bonds?

• HF

• H₂O

• NH₃

• HCl

Rank these in order of strength:

covalent bond

dispersion forces

hydrogen bond

dipole-dipole attraction

• dipole-dipole>covalent bond>hydrogen bond>dispersion

• dispersion>dipole-dipole>hydrogen bond>covalent bond

• covalent bond>hydrogen bond>dipole-dipole>dispersion

• hydrogen bond>dipole-dipole>dispersion>covalent bond

The intermolecular forces between CO₂ molecules are:

• Dispersion forces

• Dipole-dipole attraction

• Hydrogen bonds

• Covalent bonds

Which of the following has the strongest dispersion forces?

• 
• 
• 
• 

Which of the following correctly describes how melting point and boiling point are determined?

• The stronger the the intermolecular bonds, the higher the melting and boiling points

• The stronger the intramolecular bonds, the higher the melting and boiling points

• The stronger the intermolecular bonds, the lower the melting and boiling points

• The stronger the hydrogen bonds, the higher the melting and boiling points

Which substance would have the lowest boiling point?

• CH₄

• H₂S

• H₂O

• NH₃

Why does water have such a high melting boiling point?

• Because of the strong hydrogen bonds between water molecules

• Because water is a large molecule resulting in a large amount of dispersion forces

• Because of the strong polar covalent bonds within water molecules

• Because the intermolecular bonds between water are weak