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John Dalton - Atomic Theory & Gas Experiments

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Yuxuan Zhao

on 21 September 2012

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Transcript of John Dalton - Atomic Theory & Gas Experiments

Atomic Theories & Gas Experiments John Dalton Atomic Theory The Premise: atoms of different elements could be distinguished by differences in their weights

The fundamental difference of each atom is the atomic mass 1. All matter is composed of atoms

2. atoms cannot be made or destroyed

3. All atoms of the same element are identical

(Continued) The Theory in Detail 4. Different elements have different types of atoms

5. Chemical reactions occur when atoms are rearranged

6. Compounds are formed from atoms of the constituent elements The Theory in Detail He measured the amount of water vapor that air could absorb at different temperatures

Then derive the formula: PT = P1 + P2 + P3 + ... (known as Dalton's Law of Partial Pressures)
Dalton's Gas Experiment His discovery in atoms led to a bright future of molecules and compounds; although part of his theory was superseded due to the lack of precise measurement, he made fundamental assumptions Dalton's Legacy Thank You
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