General Chemistry II - Quarter 3

Which among the following substances are polar?

• O₂

• HBr

• CH₄

• O₃

How can you determine if a molecule is polar or nonpolar given its structure?

• By analyzing the number of atoms in the molecule.

• By examining the shape of the molecule and the electronegativity of its atoms. 

• By counting the number of lone pairs of electrons.

• By calculating the molecular weight of the molecule.

How does the polarity of a molecule relate to its properties?

• Polar molecules tend to have higher boiling points and melting points compared to nonpolar molecules. 

• Polar molecules tend to have lower boiling points and melting points compared to nonpolar molecules.

•  Polarity does not affect the physical properties of a molecule. 

• The polarity of a molecule only affects its chemical properties, not its physical properties.

Which of the following substances is nonpolar?

• H₂O

• CO₂

• NH₃

• HCl

What is referred to as the forces of attraction and repulsion between interacting molecules?

• Attractive force

• Repulsive Force

• Intermolecular Force

• Intramolecular Force

What force of attraction holds HCl molecules together (HCl molecules are polar)?

• dispersion interactions 

• dipole-dipole interactions

• Van der Waals interactions

•  dipole-induced dipole interactions

When NaCl dissolves in water, aqueous Na+ and Cl- ions result. What force of attraction exists between Na+ and H2O?

• ion-ion

• ion-dipole

• ion-induced dipole

• dipole-dipole

Which of the following substances is held by only London dispersion forces?

• I₂

• NH₃

• H₂O

• CH₃OH

What type of intermolecular forces exist between Br₂ and CCl₄ (both nonpolar molecules)?

• dispersion forces

• dispersion forces and ion-dipole

• dispersion forces and dipole-dipole

• dispersion forces, ion-dipole, and dipole-dipole

What is the strongest intermolecular force in liquid ammonia, NH3 (polar molecule) ?

• dipole

• dispersion forces

• hydrogen bonds

• all of the above