Class 9 Mixtures

### Topics to be covered

=> General introduction
=> Mixtures

### 𝐆𝐄𝐍𝐄𝐑𝐀𝐋 𝐈𝐍𝐓𝐑𝐎𝐃𝐔𝐂𝐓𝐈𝐎𝐍

color{green}(•) For a common person word pure over these products means having no adulteration. But, according to scientist these are actually mixtures of different substances and hence not pure.

color{green}(•) For example, milk is actually a mixture of water, fat, proteins etc.

color{green}(•) When a scientist says that something is pure, it means that all the constituent particles of that substance are the same in their chemical nature.

color{green}(•) A pure substance consists of a single type of particles.

color{green}(•) But as we look around, we can see that most of the matter around us exist as mixtures of two or more pure components, for example, sea water, minerals, soil etc. are all mixtures.

### 𝐌𝐈𝐗𝐓𝐔𝐑𝐄𝐒

color{green}(•) Mixtures are constituted by more than one kind of pure form of matter, known as a substance.

color{green}(•) A substance cannot be separated into other kinds of matter by any physical process.

color{green}(•) For eg: Sugar is a substance because it contains only one kind of pure matter and its composition is the same throughout.

color{green}("𝐓𝐘𝐏𝐄𝐒 𝐎𝐅 𝐌𝐈𝐗𝐓𝐔𝐑𝐄")

color{red}("𝟏 𝐇𝐎𝐌𝐎𝐆𝐄𝐍𝐄𝐎𝐔𝐒 𝐌𝐈𝐗𝐓𝐔𝐑𝐄:") A mixture is said to be homogeneous if all the components of the mixture are uniformally mixed and there are no boundaries of separation between them. For eg: mixture of sugar in water.

color{red}("𝟐 𝐇𝐄𝐓𝐄𝐑𝐎𝐆𝐄𝐍𝐄𝐎𝐔𝐒 𝐌𝐈𝐗𝐓𝐔𝐑𝐄:") A mixture is said to be heterogeneous if all the components of the mixture are not thoroughly mixed and there are visible boundaries of separation between them. For eg; sand in water.