Question

friends can any one send me notes of class 9 ch2 topic 2.1​

Answer 1

Answer:

There are two main types of mixtures: homogeneous mixtures and heterogeneous mixtures. The types of mixtures are discussed below.

1. What is a Heterogeneous Mixture?

A mixture of sand mixed with salt is an example of a heterogeneous mixture. Heterogeneous mixtures possess different properties and compositions in various parts i.e. the properties are not uniform throughout the mixture.

Examples of Heterogeneous mixtures – air, oil, and water, etc.

2. What is a Homogeneous Mixture?

Sugar mixed with water is the most common example of a homogeneous mixture. Homogeneous mixtures can be defined as the mixtures which possess the same properties and combination throughout their mass.

Examples of Homogeneous mixtures – alloys, salt, and water, alcohol in water, etc.

Characteristics of Mixtures

The constituents of a mixture are not present in a fixed ratio. The various characteristics of mixtures are discussed below.  

There is no chemical force acting between the two or more substances that are mixed, but they still exist together.

.They can either be heterogeneous or homogeneous in nature.

.The proportions of the substances vary in an indefinite manner.

.The properties of the mixture depending upon the individual components.

.The constituents of the mixture can be separated by physical methods.

.Boiling point and the melting point of the mixture depends upon the characteristic of the constituents.

.During the formation of a mixture, there is no change in energy.

.All the states of matter (solid, liquid, gases) can combine to form mixtures.

It can be concluded that almost everything in our vicinity is nothing but a mixture. For example, the food we eat is a mixture of ingredients, the atmospheric air we breathe is a combination of gases and the fuel we use in locomotives is a heterogeneous mixture.

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