Chapter 2.7, Problem 2.8CE

(a)

Interpretation Introduction

Interpretation:

A soft, waxy solid substance is ionic or molecular has to be predicted.

Concept Introduction:

Ionic compounds:

An atom or a molecule having a net electrical charge is known as ion.  Charge of the electron is negative and charge of the proton is positive.  Both electron and proton have the same magnitude.  Positively charged ion is called cation and negatively charged ion is called anion.  Because of the opposite charge of cation and anion they will readily form ionic compounds.  Iona consisting of only a single atom known as monoatomic ions and more than two atoms form polyatomic ions.

Molecular compounds:

Molecular compound is formed by the combination of two or more non-metals.  It is formed by the sharing of electrons.  Water, hydrogen sulfide etc are examples of molecular compounds.

(b)

Interpretation Introduction

Interpretation:

The given compound ${{\text{(NH}}_{\text{4}}\text{)}}_{\text{2}}{\text{Cr}}_{\text{2}}{\text{O}}_{\text{7}}$ is ionic or molecular has to be predicted.

Concept Introduction:

Refer to part (a).

(c)

Interpretation Introduction

Interpretation:

The given compound ${\text{C}}_{\text{2}}{\text{H}}_{\text{5}}{\text{NO}}_{\text{2}}$ is ionic or molecular has to be predicted.

Concept Introduction:

Refer to part (a).

(d)

Interpretation Introduction

Interpretation:

A hard, brittle solid is ionic or molecular has to be predicted.

Concept Introduction:

Refer to part (a).

(e)

Interpretation Introduction

Interpretation:

The given compound ${\text{Rb}}_{\text{2}}\text{O}$ is ionic or molecular has to be predicted.

Concept Introduction:

Refer to part (a).

(f)

Interpretation Introduction

Interpretation:

A substance which is gas at room temperature is ionic or molecular has to be predicted.

Concept Introduction:

Refer to part (a).