Unit 8 Chemistry

What causes dipole-dipole interactions between molecules?

• Sharing of electrons

• Uneven charge distribution

• Transfer of electrons

• Nuclear forces

Which of the following best explains why ethanol (CH₃CH₂OH) has a higher boiling point than dimethyl ether (CH₃OCH₃)?

• Ethanol has stronger covalent bonds

• Ethanol forms hydrogen bonds

• Ethanol has a higher molecular mass

• Ethanol has more carbon atoms

If a gas has the same temperature throughout, which gas molecule has the highest average velocity?

• lighter particles

• heavier particles

At what temperature (in Kelvin) would 4.0 moles of hydrogen gas in a 100 liter container exert a pressure of 1.00 atmospheres?

• 0.0305 K

• 32.8 K

• 0.487 K

• 304.5 K

Which molecule would have stronger intermolecular forces present?

• Br₂

• I₂

• Cl₂

Which substance would have the weakest intermolecular forces of attraction?

• CH₄

• NaCl

• H₂O

• MgF₂

Which type of intermolecular force is present in HF?

• hydrogen bond

• dipole-dipole

• london dispersion force

According to kinetic molecular theory, the average kinetic energy of gas particles is directly proportional to:

• Pressure

• Volume

• Temperature

• Number of moles

What happens to gas particles' average speed as temperature increases?

• decreases

• increases

• remains constant