Chapter 2, Problem 2.47AP

(a)

Interpretation Introduction

Interpretation:

The chemical formula ${\text{H}}_{\text{2}}$ represents an element or a compound has to be given.

Concept Introduction:

Compounds:

A compound contains atoms of different elements combined together in a fixed ratio.  It can be represented using a formula.

Elements:

An element is a pure chemical substance made up of same type of atom and it can be represented using symbols.  There are about $\text{118}$ elements that have been observed and they are classified as metal, non-metal, and, metalloids.

(b)

Interpretation Introduction

Interpretation:

The chemical formula ${\text{H}}_{\text{2}}{\text{O}}_{\text{2}}$ represents an element or a compound has to be given.

Concept Introduction:

Refer to part (a).

(c)

Interpretation Introduction

Interpretation:

The chemical formula ${\text{S}}_{\text{8}}$ represents an element or a compound has to be given.

Concept Introduction:

Refer to part (a).

(d)

Interpretation Introduction

Interpretation:

The chemical formula ${\text{Na}}_{\text{2}}{\text{CO}}_{\text{3}}$ represents an element or a compound has to be given.

Concept Introduction:

Refer to part (a).