1. The Atom: From Philosophical Idea to Scientific Theory
   
   1. Describe the major contributions of each of the following to the modern theory of the atom:
      a) Democritus
      b) John Dalton
      
   2. List the five essential points of Dalton's atomic theory.
      
   3. Explain each of the following in terms of Dalton's atomic theory:
      a) the law of conservation of mass
      b) the law of definite proportions
      c) the law of multiple proportions
      
      
      
   4. According to the law of conservation of mass, if element A has an atomic mass of two mass units and element B has an atomic mass of three mass units, what mass would be expected for
      a) compound AB
      b) compound A2B3
      
      

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