A mixture is a substance that is made by mixing two or more elements or compounds together in any given proportion.
Example- Soil, air, sugar syrup etc. Air is a mixture of Nitrogen, oxygen, carbon dioxide, argon, water vapor and a small amount of a few other gases.
The properties of a mixture are-
- The amount of substances in a mixture is variable. Substances can be mixed in any amount. Based on the nature of the mixing, the mixture can be either homogenous or heterogenous.
A homogenous mixture is a mixture of two or more substances uniformly. There is no boundary or visible barrier between the constituents of this kind of mixture. Its composition is uniform throughout its mass.
For example, sugar syrup is uniform in its composition and the proportion is always the same.
A heterogenous mixture, on the other hand, is not uniform in its composition. There is visible and sharp boundaries among its constituents.
For example, if you mix sand and sugar, the mixture will not be uniform at all places and you can differentiate the sand and the sugar even with naked eye.
- The individual elements in a mixture retain their chemical properties. There is no chemical change in the formation of a mixture.
For example, when you mix water and alcohol, both of them retain their chemical properties. There is no change in that.
- The different elements of a mixture can be separated by simple physical processes such as filtration, evaporation, magnetic intervention etc.
For example, a mixture of sulfur and iron filings can be differentiated by placing a magnet near the mixture. The magnet will pull out all the iron filings from the mixture.
- There is no change in the energy while preparing a mixture.
For example, when you mix sugar in water, no change of energy takes place.