London Dispersion Forces

London forces are stronger in heavier atoms or molecules, and weaker in lighter atoms or molecules.  Which of these has the strongest London forces?

• F₂

• Br₂

• I₂

• Cl₂

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

Which of the following molecules would likely have the strongest London dispersion forces?

What is the main intermolecular force in S₈?

• Dipole-Dipole

• Hydrogen Bonding

• London Dispersion

• Ion-Dipole

Which of the following can result in a London dispersion force?

• When a non-polar molecule becomes slightly polar for an instant

• When the oppositely charged ends of a polar molecule attract each other.

• When there is very strong dipole-dipole attraction between a hydrogen atom and a polar molecule

• When an ion comes close enough to a non-polar molecule to change its electron density.

In liquid sulfur dioxide, which of the following types of intermolecular force(s) would be present?

• London dispersion forces 

• London dispersion forces, dipole-dipole forces

• London dispersion forces, dipole-dipole forces, hydrogen bonding 

• London dispersion forces, dipole-dipole forces, hydrogen bonding, covalent bonds

Water (H2O) and dihydrogen monosulfide (H2S) have similar chemical formulas and structures. At room temperature, H2O is a liquid and H2S is a gas. Which of the following best explains this difference?

• H2S molecules are larger and exhibit stronger London dispersion forces and require a greater amount of energy to break.

• H2S molecules are larger and thus the electrons are not attracted as strongly, which makes the  covalent bonds in H2S molecules easier to break.

•  H2O molecules exhibit hydrogen bonding, and thus the attractive forces between water  molecules are stronger than the attractive forces between H2S molecules.

• H2O molecules are smaller and thus exhibit weaker London dispersion forces and require a lesser amount of energy to break

Which of the following lists all intermolecular forces experienced between this molecule and an identical molecule?

• Covalent bonding, dipole-dipole, and London dispersion forces would be present. 

• Only dipole-dipole and London dispersion forces would be present

• Only covalent bonding and London dispersion forces would be present.

• Only London dispersions forces would be present.

Tags

NGSS.HS-PS2-6

For a container of liquid trimethylamine, what intermolecular forces would be present?

• London Dispersion Forces

• London Dispersion Forces, Dipole-Dipole

• London Dispersion Forces, Dipole-Dipole, Hydrogen Bonding

• London Dispersion Forces, Dipole-Dipole, Covalent bonds