Chapter 3, Problem 85A

Interpretation Introduction

(a)

Interpretation:

Whether air is pure substance, homogeneous or a heterogeneous mixture needs to be determined.

Concept introduction:

A pure substance is one that are made up of only one kind of atom or molecule.

Homogeneous mixture is the mixture of two or more substances that are not separable or they are present in the same phase, as the mixture of two gases.

Heterogeneous mixtures are separable and are generally in different phases as sand water, or a mixture of two solids that are separable.

Answer to Problem 85A

Air is a homogeneous mixture.

Explanation of Solution

Homogeneous mixture is the mixture of two or more substances that are not separable or they are present in the same phase, as the mixture of two gases.

Air comprises of different gases as well other small particles that are not easily separable hence considered homogeneous.

(b)

Interpretation Introduction

Interpretation:

Whether aerosol is a pure substance, a homogeneous or a heterogeneous mixture needs to be determined.

Concept introduction:

A pure substance is one that are made up of only one kind of atom or molecule.

Homogeneous mixture is the mixture of two or more substances that are not separable or they are present in the same phase, as the mixture of two gases.

Heterogeneous mixtures are separable and are generally in different phases as sand water, or a mixture of two solids that are separable.

Answer to Problem 85A

Aerosol is a heterogeneous mixture.

Explanation of Solution

Heterogeneous mixtures are separable and are generally in different phases as sand water, or a mixture of two solids that are separable.

Aerosol is a heterogeneous suspension of fine solid particles or liquid droplets in air. It is the colloidal suspension of solid particles in liquid, where solid is dispersion medium and liquid is dispersed phase.

(c)

Interpretation Introduction

Interpretation:

Whether soil is a pure substance, a homogeneous or a heterogeneous mixture needs to be determined.

Concept introduction:

A pure substance is one that are made up of only one kind of atom or molecule.

Homogeneous mixture is the mixture of two or more substances that are not separable or they are present in the same phase, as the mixture of two gases.

Heterogeneous mixtures are separable and are generally in different phases as sand water, or a mixture of two solids that are separable.

Answer to Problem 85A

Soil is a heterogeneous mixture.

Explanation of Solution

Heterogeneous mixtures are separable and are generally in different phases as sand water, or a mixture of two solids that are separable.

Soil consists of pebbles, plant matter and sand in it. They all stay separate in the mixture and the different substances can be easily handpicked. The heterogeneous mixture are non-uniform.

(d)

Interpretation Introduction

Interpretation:

Whether water is a pure substance, a homogeneous or a heterogeneous mixture needs to be determined.

Concept introduction:

A pure substance is one that are made up of only one kind of atom or molecule.

Homogeneous mixture is the mixture of two or more substances that are not separable or they are present in the same phase, as the mixture of two gases.

Heterogeneous mixtures are separable and are generally in different phases as sand water, or a mixture of two solids that are separable.

Answer to Problem 85A

Water is a homogeneous mixture.

Explanation of Solution

Homogeneous mixture is the mixture of two or more substances that are not separable or they are present in the same phase, as the mixture of two gases.

As the salt or other particle even if present tin some quantity are dissolved and cannot be separated sothey are considered to be homogenous. Pure water is homogeneous.

(e)

Interpretation Introduction

Interpretation:

Whether sediment is a pure substance, a homogeneous or a heterogeneous mixture needs to be determined.

Concept introduction:

A pure substance is one that are made up of only one kind of atom or molecule.

Homogeneous mixture is the mixture of two or more substances that are not separable or they are present in the same phase, as the mixture of two gases.

Heterogeneous mixtures are separable and are generally in different phases as sand water, or a mixture of two solids that are separable.

Answer to Problem 85A

Sediment is a heterogeneous mixture.

Explanation of Solution

Heterogeneous mixtures are separable and are generally in different phases as sand water, or a mixture of two solids that are separable.

Sediment is made of rocks, minerals as well as remains of plants and animals. A sediment can be small or very large. They keep moving through the process called Erosion.

(f)

Interpretation Introduction

Interpretation:

Whether muddy water is a pure substance, a homogeneous or a heterogeneous mixture needs to be determined.

Concept introduction:

A pure substance is one that are made up of only one kind of atom or molecule.

Homogeneous mixture is the mixture of two or more substances that are not separable or they are present in the same phase, as the mixture of two gases.

Heterogeneous mixtures are separable and are generally in different phases as sand water, or a mixture of two solids that are separable.

Answer to Problem 85A

Muddy water is a heterogeneous mixture.

Explanation of Solution

Heterogeneous mixtures are separable and are generally in different phases as sand water, or a mixture of two solids that are separable.

Muddy water consists of the soil particles that are visible and not totally dissolved. So the soil can be easily filtered out from the water with the help of filtered paper. Hence, the mixture is said heterogeneous.