Chapter 4, Problem 120A

(a)

Interpretation Introduction

Interpretation:

The given salt water mixture need to be identified as homogenous and heterogeneous mixtures.

Concept introduction:

Homogenous mixture in which component is present in the uniform composition throughout the solution, and the component can’t be separated easily. All solutions are examples of homogenous mixtures. Often it is easy to create confusion between pure substances and the homogeneous mixture.

Heterogeneous mixtures have composition which is different from each other. Components can be of two phases or layers and they can be separated and seen easily.

Answer to Problem 120A

Salt water − homogeneous mixture

Explanation of Solution

Salt water is the mixture of the salt and water. When this solution is formed it is uniform in the composition and phase is same for both. The solution components are similar in phase and can’t be separated easily. Thus, it is a homogenous mixture.

(b)

Interpretation Introduction

Interpretation:

The given vegetable soup mixture need to be identified as homogenous and heterogeneous mixtures.

Concept introduction:

Homogenous mixture in which component is present in the uniform composition throughout the solution, and the component can’t be separated easily. All solutions are examples of homogenous mixtures. Often it is easy to create confusion between pure substances and the homogeneous mixture.

Heterogeneous mixtures have composition which is different from each other. Components can be of two phases or layers and they can be separated and seen easily.

Answer to Problem 120A

Vegetable soup- heterogeneous mixture

Explanation of Solution

Vegetable soup is the example of heterogeneous mixture because in this mixture one phase would be liquid soup it self and other like cubes of vegetables. They can be separated easily. Two phases are different from each other.

(c)

Interpretation Introduction

Interpretation:

The given 14-K gold mixture needs to be identified as homogenous and heterogeneous mixtures.

Concept introduction:

Homogenous mixture in which component is present in the uniform composition throughout the solution, and the component can’t be separated easily. All solutions are examples of homogenous mixtures. Often it is easy to create confusion between pure substances and the homogeneous mixture.

Heterogeneous mixtures have composition which is different from each other. Components can be of two phases or layers and they can be separated and seen easily.

Answer to Problem 120A

14-K gold- homogeneous mixture.

Explanation of Solution

In the 14-K gold, other substances are mixed in uniform manner. Because the pure form of gold is very soft in texture, after mixing some other substances, the gold is ready to use in making jewellery. But the mixture is totally uniform in nature and in same phase.

(b)

Interpretation Introduction

Interpretation:

The given concrete mixture needs to be identified as homogenous and heterogeneous mixtures.

Concept introduction:

Homogenous mixture in which component is present in the uniform composition throughout the solution, and the component can’t be separated easily. All solutions are examples of homogenous mixtures. Often it is easy to create confusion between pure substances and the homogeneous mixture.

Heterogeneous mixtures have composition which is different from each other. Components can be of two phases or layers and they can be separated and seen easily.

Answer to Problem 120A

Concrete- heterogeneous mixture.

Explanation of Solution

This is the mixture of some calcium compounds, sand and water. They are mixed together to form heterogeneous mixture. After mixing the particles, they can be identified separately due to coarse aggregates present in it.