Chapter 11, Problem 77AE

(a)

Interpretation Introduction

Interpretation:

The bond angle in $H_{2}S$ has to be identified.

Concept Introduction:

Determination of shape using VSEPR theory:

1. 1) The Lewis structure of the molecule is drawn.

The representation of valence shell electrons around the atom is known as Lewis structure or Lewis dot structure.  Electrons are represented as a dot in Lewis structures, a single dot represents unpaired electron and paired of dots represents paired electrons.

1. 2) The electron pairs surrounding the central atom are counted and the electron pairs are arranged with minimum repulsion. Thus arrangements of electron pairs are determined.
2. 3) The positions of other atoms are determined.
3. 4) The molecular structure is then identified.

From the shape of the molecule, the bond angle can be identified.

(b)

Interpretation Introduction

Interpretation:

The bond angle in $N{H}_3$ has to be identified.

Concept Introduction:

Refer part (a).

(c)

Interpretation Introduction

Interpretation:

The bond angle in $N{H}_4{}^{+}$ has to be identified.

Concept Introduction:

Refer part (a).

(d)

Interpretation Introduction

Interpretation:

The bond angle in $SiC{l}_4$ has to be identified.

Concept Introduction:

Refer part (a).