Chapter 2 IS MATTER AROUND US PURE

Physical and Chemical
Changes

The properties that can be observed and specified like colour, hardness, rigidity, fluidity, density, melting point, boiling point etc. are the physical properites. The interconversion of states is a physical change because these changes occur without a change in composition and no change inthe chemical nature of the substance.Although ice, water and water vapour all …

Physical and Chemical
Changes
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HOW CAN WE OBTAIN PURE COPPER SULPHATE FROM AN IMPURE SAMPLE?

The crystallisation method is used to purify solids. For example, the salt we get from sea water can have many impurities in it. To remove these impurities, the process of crystallisation is used. Crystallisation is a process that separates a pure solid in the formof its crystals from a solution. Crystallisation technique is better than …

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HOW CAN WE SEPARATE A MIXTURE OF TWO MISCIBLE LIQUIDS?

This method is called distillation. It is used for the separation of components of a mixture containing two miscible liquids that boilwithout decomposition and have sufficient difference in their boiling points. To separate a mixture of two or more miscible liquids for which the difference in boiling points is less than 25 K, fractional distillation …

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