IMF and Properties

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

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

Tags

NGSS.HS-PS1-3

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

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)

Tags

NGSS.HS-PS1-3

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

• CO₂

• H₂O

Tags

NGSS.MS-PS1-4