Chapter U1.5, Problem 2E

Interpretation Introduction

Interpretation:

The use of density to determine the presence of solid gold in the golden penny needs to be explained.

Concept introduction:

A matter can exist in three different states; solid, liquid and gases. All these states of matter can exhibit different physical and chemical properties.

They can be differentiated on the basis of certain physical properties such as density, melting boiling point, etc.

Answer to Problem 2E

If density of golden penny is same as the density of pure gold, it proves that the given golden penny is made up of pure gold.

Explanation of Solution

Density of a substance is unique and can be used to identify the substance. Thus, if mass and volume of golden penny are measured and density is calculated the value can be compared with the density of pure gold.

If the golden penny is made from solid gold, its density should be equivalent to the density of pure gold.

If the density is more or less than standard density of gold, it indicates that the golden penny must have some other substance or element in it.