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SAI International School
                                                        Class-IX
                                                 Subject- Chemistry

                                           Topic-Atoms and molecules
                                                      Concept Map
                                                      Lesson Note


                                                   Concept Mapping
                     Laws of Chemical combinations                   Law of conservation of mass
                                                                      Law of definite proportion


                     Dalton’s atomic theory                          Postulates of Dalton’s atomic
                                                                        theory.
                                                                      Drawbacks of Dalton’s atomic
                                                                        theory.


                     Symbols of elements                             Symbols of elements.
                                                                      Symbols of elements derived
                                                                        from the first letter of their
                                                                        names.
                                                                      Symbols of elements derived
                                                                        from the first letter of their
                                                                        names.
                                                                      Symbols of elements derived
                                                                        from first letter and any other
                                                                        prominent letter of their names.
                                                                      Symbols of elements derived
                                                                        from their Latin names.

                     Atomic and relative atomic masses               Concept of atomic masses

                                                                      Relative atomic mass.
                                                                                                 12
                                                                      Reasons for choosing C  for
                                                                        relative atomic masses.
                                                                      Relative molecular masses.
                                                                      Mole concept
                                                                      Conversion of mass into moles
                                                                        and vice versa.
                                                                      Conversion of moles into number
                                                                        of particles and vice versa.











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