Chapter 2, Problem 75E

Interpretation Introduction

(a)

Interpretation:

Whether the powder is an element or a compound is to be predicted.

Concept introduction:

Element is a purest form of substance that cannot be broken down using chemical reactions. A compound is a pure substance formed when two or more chemical elements are chemically bonded together and can be broken down using chemical reactions

Element as well as compound both has definite composition and properties.

Interpretation Introduction

(b)

Interpretation:

Whether the contents of the box are homogenous or heterogeneous is to be predicted.

Concept introduction:

A homogeneous mixture has the same proportions of its components throughout a given sample having uniform appearance. A heterogeneous mixture has components whose proportions vary throughout the sample and visibly different substances the appearance is not uniform throughout.

Interpretation Introduction

(c)

Interpretation:

Whether the contents of the box are either a pure substance or a mixture is to be predicted.

Concept introduction:

A mixture is defined as a substance made by combination of two or more different materials in such a way that no chemical reaction occurs. A mixture can usually be separated back into its original components by various chemical or physical methods.

A pure substance has constant physical and chemical properties and cannot be separated by any physical or chemical methods it does not have varying composition.