Intermolecular Forces and Properties Review

Rank these in order of strength:

covalent bond

London dispersion forces

hydrogen bond

dipole-dipole attraction

• dipole-dipole>covalent bond>hydrogen bond>London

• London>dipole-diple>hydrogen bond>covalent bond

• covalent bond>hydrogen bond>dipole-dipole>London

• hydrogen bond>dipole-dipole>London>covalent bond

Tags

NGSS.HS-PS1-3

What intermolecular forces does ethanol (CH₃CH₂OH) have?

• London dispersion

• London dispersion and dipole-diploe

• Dipole-dipole and H-bonding

• London dispersion, dipole-dipole, and H-bonding

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

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.

Which noble gas has the highest boiling point?

• Xe
• Kr
• Ar
• He

Why is Xe the noble gas with the highest boiling point?

• All noble gases have only dispersion forces. As Xe has the most electrons, it has the strongest dispersion forces

• It is the most polar of the noble gases

• Xe has hydrogen bonds

• Xe has more mass, so gravity pulls the atoms together

Tags

NGSS.HS-PS1-3

London dispersion forces are stronger in heavier atoms or molecules, and weaker in lighter atoms or molecules.

Which of these has the strongest London dispersion forces?

• F₂

• Br₂

• I₂

• Cl₂

Which of the following has the highest boiling point?

• H₂ (nonpolar; 2.02 g/mol)

• NH₃ (polar; 17.03 g/mol)

• N₂ (nonpolar; 28.02 g/mol)

• O₂ (nonpolar; 32.00 g/mol)

Which one has a higher melting point: CO₂ or H₂O?

• CO₂

• H₂O

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4