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SAI INTERNATIONAL SCHOOL
                                                       CLASS- VI
                                               SUBJECT- CHEMISTRY
                                   TOPIC –SEPARATION OF SUBSTANCES
                 SUB-TOPIC- METHODS OF SEPARATION- SEPARATION OF SOLIDS
                                                      FROM LIQUIDS



                                                   LESSON NOTES



               SEPARATION OF SOLIDS FROM SOLID-LIQUID MIXTURES:

               Solid substances may be either soluble or insoluble in a liquid. Substances like sugar
               and salt that dissolve in water are said to be soluble. Substances like sand and chalk do
               not dissolve in water are said to be insoluble.

               Different methods are used for separating soluble and insoluble substances from their
               mixtures.

               SEPARATING INSOLUBLE SOLIDS FROM LIQUIDS:

               Sedimentation and decantation:


               Sedimentation is the process of settling down of heavier, insoluble components in a
               mixture. The particles that settle down are called sediments and the clear liquid that
               remains on top is the supernatant.

               Decantation is the process of pouring out the supernatant liquid slowly into another
               container without disturbing the sediment.

               Example: A mixture of sand and water is allowed to stand for some time. Settling of the
               sand at the bottom of the container is sedimentation. Pouring of the clear liquid from the
               top to another container is decantation.
























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