Intermolecular forces

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.

Tags

NGSS.MS-PS1-4

Hydrogen bonding occurs when hydrogen is bonded to N, O, or F.  Which of the following has hydrogen bonding?

• CBr₄
• NO₂
• H₂S
• NH₃

Does H₂S have hydrogen bonding?

• yes
• no

Does NH₃ have hydrogen bonding?

• yes
• no

Tags

NGSS.HS-PS2-6

Does CH₄ have hydrogen bonding?

• yes
• no

Which is the second strongest intermolecular force, after hydrogen bonding?

• dipole-dipole attraction
• London forces

Tags

NGSS.HS-PS1-3

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

London forces are stronger in heavier atoms or molecules, and weaker in lighter atoms or molecules.  Which of these has the strongest London forces?

• F₂
• Br₂
• I₂
• Cl₂

Tags

NGSS.HS-PS1-3

A substance capable of hydrogen bonding has a ___________ boiling point than a similar substance that doesn't hydrogen bond.

• higher
• lower

In general, substances with stronger intermolecular forces have ___________  boiling points than those with weaker intermolecular forces

• higher
• lower

Tags

NGSS.HS-PS1-3