Chapter 7.2, Problem 7.3WE

(a)

Interpretation Introduction

Interpretation: the given molecules ${\text{PCl}}_{\text{5}}$ and ${\text{H}}_2\text{CO}$ are polar or not should be determined.

Concept introduction:

• Polarity of a bond is due to the difference in electro-negativities of atoms presented in it. The polarities of bonds are represented by using vectors.
• If the result of all bond polarities or vector sum is non-zero in a molecule, then the molecule is called as polar molecule.
• If the result of all bond polarities or vector sum is zero in a molecule, then the molecule is called as nonpolar molecule.
• Parallel vectors will give non-zero values and 

To determine: whether the molecule ${\text{PCl}}_{\text{5}}$ is polar or nonpolar.

(b)

Interpretation Introduction

Interpretation: the given molecules ${\text{PCl}}_{\text{5}}$ and ${\text{H}}_2\text{CO}$ are polar or not should be determined.

Concept introduction:

• Polarity of a bond is due to the difference in electro-negativities of atoms presented in it. The polarities of bonds are represented by using vectors.
• If the result of all bond polarities or vector sum is non-zero in a molecule, then the molecule is called as polar molecule.
• If the result of all bond polarities or vector sum is zero in a molecule, then the molecule is called as nonpolar molecule.
• Parallel vectors will give non-zero values and 

To determine: whether the molecule ${\text{H}}_2\text{CO}$ is polar or nonpolar.