Unit 8 - Topic 4 (Yellow Class)

Which formula represents an asymmetrical molecule?

• CH₄

• CO₂

• N₂

• NH₃

Which statement describes the charge distribution and the polarity of a CH₄ molecule?

• The charge distribution is symmetrical and the molecule is nonpolar

• The charge distribution is asymmetrical and the molecule is nonpolar

• The charge distribution is symmetrical and the molecule is polar

• The charge distribution is asymmetrical and the molecule is polar

Which phrase describes the molecular polarity and distribution of charge in a molecule of carbon dioxide, CO₂?

• polar and symmetrical

• polar and asymmetrical

• nonpolar and symmetrical

• nonpolar and asymmetrical

Which statement explains why the molecule is nonpolar?

• Electrons are shared between the carbon atoms and the hydrogen atoms.

• Electrons are transferred from the carbon atoms to the hydrogen atoms.

• The distribution of charge in the molecule is symmetrical.

• The distribution of charge in the molecule is asymmetrical.

A molecule must be nonpolar if the molecule

• is linear

• is neutral

• has ionic and covalent bonding

• has a symmetrical charge distribution

Which formula represents a polar molecule?

• O₂

• CO₂

• NH₃

• CH₄

Which statement explains why a CO₂ molecule is nonpolar?

• Carbon and oxygen are both nonmetals.

• Carbon and oxygen have different electronegativities.

• The molecule has a symmetrical distribution of charge.

• The molecule has an asymmetrical distribution of charge.

The molecule is

• symmetrical and polar

• symmetrical and nonpolar

• asymmetrical and polar

• asymmetrical and nonpolar

Which formula represents a polar molecule?

• H₂

• H₂O

• CO₂

• CCl₄

Which formula represents a nonpolar molecule?

• HCl

• H₂O

• NH₃

• CH₄