Chapter 10, Problem 10.51QE

(a)

Interpretation Introduction

Interpretation:

The polarity of ${\text{NF}}_{\text{3}}$ has to be given.

Concept Introduction:

Polarity results from the uneven partial charge distribution between various atoms in a compound.  Atoms, such as nitrogen, oxygen, and halogens that are more electronegative have a tendency to have partial negative charges.  Atoms, such as carbon and hydrogen, have a tendency to be more neutral or have partial positive charges.

Polar nature of the molecules can be measured by the dipole moment.  If a molecule has zero dipole moment then it is a non polar molecule.  If a molecule has a net dipole moment then it is a polar molecule.

(b)

Interpretation Introduction

Interpretation:

The polarity of ${\text{CBr}}_{\text{4}}$ has to be given.

Concept Introduction:

Refer to part (a).

(c)

Interpretation Introduction

Interpretation:

The polarity of ${\text{BeI}}_{\text{2}}$ has to be given

Concept Introduction:

Refer to part (a).