Intermolecular Forces Pre-Assessment

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.

To form a hydrogen bonding, Hydrogen needs to attract to the highly electronegative elements such us _____, _____, and ____

• chlorine, fluorine, and oxygen

• fluorine, oxygen, and sulfur

• fluorine, bromine, and oxygen

• fluorine, oxygen, and nitrogen

Forces that holds atoms together within the molecule

• intermolecular forces

• intramolecular forces

which of following forces is the weakest intermolecular force?

• Ionic bond

• Hydrogen bond

• Covalent bond

• van der Waals forces

At higher temperatures

• particles in an object have less energy
• particles in an object move faster
• a gas contracts

A gas

• has a definite shape but no definite volume
• has a definite volume but no definite shape
• has fast-moving particles

Define a liquid.

• Indefinite shape, indefinite volume
• Definite shape, definite volume
• Found in stars
• Definite volume, indefinite shape

Particles (molecules) in a ______________________ have more energy than the other states of matter.

• gas
• solid
• liquid

The weaker the intermolecular forces of a substance the _____________ the boiling point

• higher

• lower

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

• Higher

• Lower

• The same