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SAI INTERNATIONAL SCHOOL
                                                      CLASS-VII
                                             SUBJECT- CHEMISTRY
                              TOPIC-PHYSICAL AND CHEMICAL CHANGES
                                      SUB TOPIC- CONCEPT MAPPINP


                                                   LESSON NOTE




                                                     •1. Definition
                   A)  Reversible Change
                                                     •2. Properties and examples
                   B) Irreversible Changes           •1. Definition
                                                     2.Properties and examples

                   C) Physical Changes               •1. Definition
                                                     Properties

                                                           Different types
                   D) Chemical Changes               •1. Definition
                                                           Properties
                                                           Rusting
                                                           Browning of fruits
                   E) Different types of chemical    Reaction of vinegar and baking soda
                   reaction                                Displacement Reaction
                                                           Combination Reaction
                                                           Dissociation Reaction
                                                                             Definition
               F) Crystallisation
                                                                             Method
               G)Formation of salt







               CHANGE:

               A change refers to a noticeable difference  in the shapes, size, colour, state, internal
               structure or any other properties.

               REVERSIBLE CHANGES:

               A change in which the original substance can be reversed back to its own form. The
               change is temporary.


               Examples of reversible changes are melting of ice, making toys using clay- etc

               IRREVERSIBLE CHANGES:

               A change in which the original substance cannot be recovered. It is a permanent
               change



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