Chem presentation

Chem presentation
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  • Everything in the universe is made of Atoms and the space that they fill.  
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  • Democritus 440 B.C.
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  • This, Democritus, is false. Empty spaces do not exist. everything in the world consists of water, earth, fire, and wind
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  • Aristotle 322 B.C.
  • 2125 Years Later...
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  • Democritus was correct! I have came to the conclusion that everything is made of atoms, and that atoms are indivisible and indestructible. All atoms of a given element are identical in mass and properties. compounds are formed  by a combination of two or more different kinds of atoms. Finally, a chemical reaction is a rearrangement of atoms. 
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  • Dalton 1803
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  • What is this that I have discovered while I was using my ray tube? I will call it the electron!
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  • J.J. Thomson 1897
  • Today I have conducted an experiment which has determined the size of the charge of an electron. This also leads me to believe that charge is quantized. 
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  • Millikan 1909
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