Chapter 2, Problem 50A

(a)

Interpretation Introduction

Interpretation: Whether chocolate-chip ice cream is a homogenous or heterogenous mixture needs to be identified.

Concept Introduction: In heterogenous mixtures, the components of the mixture can be easily identified. There is more than one phase and can be seen by the naked eye. It has a non-uniform composition. A mixture in solid, liquid, or gaseous form is said to be homogenous if it has the same proportions of components throughout the sample. Thus, in any homogenous mixture, only one phase of matter is observed.

Explanation of Solution

In chocolate-chip ice cream, there are chocolate chips in cream that can be easily seen by the naked eye. In every spoon of ice cream, the number of chocolate chips is not the same; thus, it does not have a uniform composition. It is a heterogeneous mixture.

(b)

Interpretation Introduction

Interpretation: Whether green ink is a homogenous or heterogenous mixture needs to be identified.

Concept Introduction: In heterogenous mixtures, the components of the mixture can be easily identified. There is more than one phase that can be seen by the naked eye. It has a non-uniform composition. A mixture in solid, liquid, or gaseous form is said to be homogenous if it has the same proportions of components throughout the sample. Thus, in any homogenous mixture, only one phase of matter is observed.

Explanation of Solution

In green ink, components are uniformly distributed. There is only one phase for a mixture which is liquid. Since components of the mixture are uniformly distributed and cannot be identified by the naked eye, it is a homogenous mixture.

(c)

Interpretation Introduction

Interpretation: Whether the cake batter is a homogenous or heterogenous mixture needs to be identified.

Concept Introduction: In heterogenous mixtures, the components of the mixture can be easily identified. There is more than one phase and can be seen by the naked eye. It has a non-uniform composition. A mixture in solid, liquid, or gaseous form is said to be homogenous if it has the same proportions of components throughout the sample. Thus, in any homogenous mixture, only one phase of matter is observed.

Explanation of Solution

In cake batter, all the ingredients used in making a cake that as flour, sugar, eggs, oil, and baking powder are uniformly distributed. There is a single phase for all the ingredients; thus, it is a homogenous mixture. Moreover, individual components cannot be separated by any physical method.

(d)

Interpretation Introduction

Interpretation: Whether cooking oil is a homogenous or heterogenous mixture needs to be identified.

Concept Introduction: In heterogenous mixtures, the components of the mixture can be easily identified. There is more than one phase that can be seen by the naked eye. It has a non-uniform composition. A mixture in solid, liquid, or gaseous form is said to be homogenous if it has the same proportions of components throughout the sample. Thus, in any homogenous mixture, only one phase of matter is observed.

Explanation of Solution

In cooking oil, all the components are uniformly distributed. There is a single phase of the mixture that is liquid. Thus, it is a homogenous mixture.

(e)

Interpretation Introduction

Interpretation: Whether granite rock is a homogenous or heterogenous mixture needs to be identified.

Concept Introduction: In heterogenous mixtures, the components of the mixture can be easily identified. There is more than one phase and can be seen by the naked eye. It has a non-uniform composition. A mixture in solid, liquid, or gaseous form is said to be homogenous if it has the same proportions of components throughout the sample. Thus, in any homogenous mixture, only one phase of matter is observed.

Explanation of Solution

Granite rock is composed of mica, minerals, quartz, etc. These components vary in color and this color difference can be seen by the naked eyes. Thus, granite rock is a heterogenous mixture.

(f)

Interpretation Introduction

Interpretation: Whether salt water is a homogenous or heterogenous mixture needs to be identified.

Concept Introduction: In heterogenous mixtures, the components of the mixture can be easily identified. There is more than one phase that can be seen by the naked eye. It has a non-uniform composition. A mixture in solid, liquid, or gaseous form is said to be homogenous if it has the same proportions of components throughout the sample. Thus, in any homogenous mixture, only one phase of matter is observed.

Explanation of Solution

In salt water, salt and water are uniformly distributed. There is a single phase for both salt and water in the mixture that is liquid. Salt cannot be separated from water by any physical method. Thus, it is a homogenous mixture.

(g)

Interpretation Introduction

Interpretation: Whether the paint is a homogenous or heterogenous mixture needs to be identified.

Concept Introduction: In heterogenous mixtures, the components of the mixture can be easily identified. There is more than one phase that can be seen by the naked eye. It has a non-uniform composition. A mixture in solid, liquid, or gaseous form is said to be homogenous if it has the same proportions of components throughout the sample. Thus, in any homogenous mixture, only one phase of matter is observed.

Explanation of Solution

In paint, components are uniformly distributed. There is only one phase for a mixture which is liquid. Since components of the mixture are uniformly distributed and cannot be identified by the naked eye, it is a homogenous mixture.

(h)

Interpretation Introduction

Interpretation: Whether a silver ring is a homogenous or heterogenous mixture needs to be identified.

Concept Introduction: In heterogenous mixtures, the components of the mixture can be easily identified. There is more than one phase that can be seen by the naked eye. It has a non-uniform composition. A mixture in solid, liquid, or gaseous form is said to be homogenous if it has the same proportions of components throughout the sample. Thus, in any homogenous mixture, only one phase of matter is observed.

Explanation of Solution

In the silver ring, copper is also added to silver to make it suitable for making jewelry. Here, copper and silver elements are uniformly distributed. There is only one phase of the mixture; thus, it is a homogenous mixture.