Intramolecular Forces Bank

Which of the following molecules contains only London dispersion forces?

• CF₄
• HCl
• H₂O
• MgO_(aq)

Which of the following molecules predominantly consists of dipole-dipole forces?

• HF
• Ne
• O₂
• ICl

Which of the following molecules would have the lowest boiling point?

• CH₄
• C₂H₆
• C₃H₈
• C₄H₁₀

Propane is a gas at STP, while bromine is a liquid at STP. Which statement correctly explains these observations?

• Bromine has weaker intermolecular forces than propane does
• Bromine has greater molecular polarity than propane does
• Bromine has weaker molecular polarity than propane does
• Bromine has stronger intermolecular forces than propane does

Which of the following molecules has hydrogen bonding?

• HCl
• HI
• HF
• HBr

Which of the following statements correctly compares the behavior of a mixture of ethanol and water at STP?

• Water will evaporate first, because it has weaker intermolecular forces
• Ethanol will evaporate first, because it has weaker intermolecular forces
• Ethanol and water will evaporate simultaneously
• The aqueous solution will evaporate partially at a temperature between the boiling points of water and of ethanol

Which of the following statements correctly explains why hydrogen bonding is such a strong intermolecular force?

• There is an attraction between a small, weakly electronegative hydrogen atom and a large, strongly electronegative atom of fluorine, nitrogen, or oxygen
• There is an attraction between a small, highly electronegative hydrogen atom and a large, highly electronegative fluorine atom
• There is an attraction between the hydrogen and oxygen atoms, only
• There is an attraction between the hydrogen and nitrogen atoms, only

HCl and F₂ both have a molecular mass of approximately 36 g/mol. Based on IMF, which will have a lower boiling point?

• HCl
• F₂

Hydrogen bonds are a form of bonding.

• True 
• False

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.