5dalton - Dalton's Atomic Theory Glenn V Lo Department of...

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    Dalton’s Atomic Theory Glenn V. Lo Department of Physical Sciences Nicholls State University
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    Dalton’s Atomic Theory Postulate 1. Matter is made up of tiny particles  called atoms Postulate 2. Atoms are indestructible Postulate 3. All atoms of an element are  identical Postulate 4. Atoms of an element are different  from those of other elements Postulate 5. There are at least two kinds of  atoms in a compound; the relative numbers of  each kind of atom are well-defined
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    Successes of Dalton’s Theory Explains why elements cannot be  separated into distinct parts All atoms of an element are identical and  atoms are indestructible Explains the law of conservation of  mass: “total mass remains the same  even when changes occur” Atoms are indestructible; neither created  nor destroyed
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    Test Yourself Using squares and circles to represent  different kinds of atoms, which figures  represent a pure sample of an element?
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    Test Yourself Which of the changes indicated below  are impossible?
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