Chapter 3.3, Problem 15SSC

(a)

Interpretation Introduction

Interpretation:

Whether tap water is a homogenous or heterogenous mixture needs to be identified.

Concept introduction:

Mixtures are the combination of two or more pure substances. They are impure in nature. They can be separated by magnetic separation, evaporation etc.

Mixtures are of two types:

Homogeneous mixture

Heterogeneous mixture.

Answer to Problem 15SSC

Tap water is a homogenous mixture.

Explanation of Solution

The mixtures in which the components are mixed uniformly are known as homogeneous mixtures. It is also known as solution. The homogeneous mixture cannot be judge by seeing it. They have only one phase. The homogeneous mixtures cannot be separated by physical methods.

Examples of homogeneous mixture are rainwater, vinegar etc.

The mixtures in which the components are not mixed uniformly are known as heterogeneous mixtures. The heterogeneous mixture can be judge by seeing it. They have two or more phases. The heterogeneous mixtures can be separated by physical methods.

Example of heterogeneous mixture is mixture of sand and sodium chloride.

Tap water is a homogeneous mixture as it contains only one phase i.e. liquid. It contain different ions in the form of impurities but the ions cannot be separated by physical methods.

(b)

Interpretation Introduction

Interpretation:

Whether air is a homogenous or heterogenous mixture needs to be identified.

Concept introduction:

Mixtures are the combination of two or more pure substances. They are impure in nature. They can be separated by magnetic separation, evaporation etc.

Mixtures are of two types:

Homogeneous mixture

Heterogeneous mixture.

Answer to Problem 15SSC

Air is homogenous mixture.

Explanation of Solution

The mixtures in which the components are mixed uniformly are known as homogeneous mixtures. It is also known as solution. The homogeneous mixture cannot be judge by seeing it. They have only one phase. The homogeneous mixtures cannot be separated by physical methods.

Examples of homogeneous mixture are rainwater, vinegar etc.

The mixtures in which the components are not mixed uniformly are known as heterogeneous mixtures. The heterogeneous mixture can be judge by seeing it. They have two or more phases. The heterogeneous mixtures can be separated by physical methods.

Example of heterogeneous mixture is mixture of sand and sodium chloride.

Air is a homogeneous mixture as it contains mixture of gases like oxygen, nitrogen and hydrogen but present only in one phase i.e. gas which cannot be separated by physical methods.

(c)

Interpretation Introduction

Interpretation:

Whether raisin muffin is a homogenous or heterogenous mixture needs to be identified.

Concept introduction:

Mixtures are the combination of two or more pure substances. They are impure in nature. They can be separated by magnetic separation, evaporation etc.

Mixtures are of two types:

Homogeneous mixture

Heterogeneous mixture.

Answer to Problem 15SSC

Raisin muffin is heterogenous mixture.

Explanation of Solution

The mixtures in which the components are mixed uniformly are known as homogeneous mixtures. It is also known as solution. The homogeneous mixture cannot be judge by seeing it. They have only one phase. The homogeneous mixtures cannot be separated by physical methods.

Examples of homogeneous mixture are rainwater, vinegar etc.

The mixtures in which the components are not mixed uniformly are known as heterogeneous mixtures. The heterogeneous mixture can be judge by seeing it. They have two or more phases. The heterogeneous mixtures can be separated by physical methods.

Example of heterogeneous mixture is mixture of sand and sodium chloride.

Raisin muffin is a heterogeneous mixture as it contains two or more types of matters i.e. raisin and flour which can be separated by physical methods.