Page 5 - Focus SPM KSSM F4 2020 - Chemistry
P. 5

Chapter                The Mole Concept, Chemical


           3               Formula and Equation










        CHAPTER FOCUS



          •   Relative Atomic Mass and Relative Molecular Mass
          •   Mole Concept
          •   Chemical Formula
          •   Chemical Equation













































          In 1814, Jacob Berzelius (1779 – 1848), a Swedish chemist, had developed a system
          that is used till today to represent chemicals. The only difference is that superscript
          numbers are used in the system while subscript numbers are used in modern chemical
          formulae. For example, he used the formula H O for water while modern chemistry uses
                                                       2
          the formula H O.
                        2



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 03 SPM CHEMISTRY F4.indd   33                                                               27/02/2020   11:23 AM
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