Chapter U1, Problem 1RE

Interpretation Introduction

Interpretation: The difference between an element and a compound should to be explained.

Concept introduction: The smallest unit of matter that retains the chemical identity of the element is said to be an atom.

Answer to Problem 1RE

A pure substance which cannot be broken down to other smaller substances by any means that is physical or chemical is said to be an element.

A pure substance that can be separated into other smaller substances by any means that is by chemical or physical is said to be a compound.

Explanation of Solution

Element: A pure substance which consist only one type of atom that is they cannot be broken down to other smaller substances by any means that is physical or chemical is said to be an element. Each element has unique atomic number (number of protons) through which they can be identified. For example: Lead, $\text{Pb}$.

Compound: A pure substance that can be separated into other smaller substances by any means that is by chemical or physical is said to be a compound. They are formed by combination of two or more elements together. For example: Water, ${\text{H}}_{\text{2}}\text{O}$.