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Timeline OF THE Atom 1795-1825

Timeline OF THE Atom 1795-1825. Joseph Proust. Born September 26, 1754, died July 5,1826 French Chemist Most famous for Law of Definite Proportions: A given compound always has the same elements in the same proportion by mass

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Timeline OF THE Atom 1795-1825

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  1. Timeline OF THE Atom1795-1825

  2. Joseph Proust • Born September 26, 1754, died July 5,1826 • French Chemist • Most famous for Law of Definite Proportions: • A given compound always has the same elements in the same proportion by mass • Proust studied two tin oxides and the two iron sulfides, and proved that they each had different compositions and that there were no substances with intermediate composition. • This law soon helped John Dalton develop his Atomic Theory.

  3. John Dalton • Born September 6, 1766, died July 24, 1844 • English Chemist • Dalton’s Atomic Theory: • 1) All matter is made of atoms. Atoms are indivisible and indestructible.2) All atoms of a given element are identical in mass and properties3) Compounds are formed by a combination of two or more different kinds of atoms.4) A chemical reaction is a rearrangement of atoms

  4. Sir Humphry Davy • Born December 17, 1778, died May 29, 1829 • British Chemist • He discovered potassium, sodium, and many more important metals through electrolysis. • Electrolysis is a method of separating bonded elements and compounds by passing an electric current through them.

  5. Experiment • For our experiment we chose to recreate Sir Humphry Davy’s potassium experiment. • Davy discovered potassium by using electrolysis, a method of separating elements by passing an electric charge through them. • Davy used a Voltaic Pile in this experiment. • First, he tried to electrolyze a mixture of potash and water, but found that only the water was affected. • Potash is a base form of potassium. • Next, he melted the potash and put it on a platinum spoon. Then he attached the positive end of his Voltaic pile to the spoon and placed a platinum wire connected to the negative end in the potash. But this didn’t work either. • Finally, Davy tried this again but with dried solid potash. This time it was successful. He observed small metallic bubbles with a metallic luster. • He had discovered potassium!

  6. Pictures Voltaic Pile Result Potassium

  7. Potassium Atom

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