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9th Class Science Atoms and Molecules Question Bank 9th CBSE Science Atoms and Molecules

  • question_answer
      Fill in the blanks (a) In a chemical reaction, the sum of the masses of the reactants and products remains unchanged. This is called .... (b) A group of atoms carrying a fixed charge on them is called .... (c) The formula unit mass of is (d) Formula of sodium carbonate is ... and that of ammonium sulphate is ....

    Answer:

                    (a) law of conservation of mass                 (b) polyatomic ion                         (c)  = 3 x 40 + 2 x 31 + 8 x 16 = 120 + 62 + 128 = 310 u    (d) , and             


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