• Chemistry History
    1620 Van Helmont Foundations of chemical physiology 1625 Glauber Contributions to practical chemistry 1661 Boyle The Sceptical Chymist 1766 Cavendish Discovery of hydrogen 1775 Lavoisier Discovery of the composition of air 1787 Lavoisier & Berthollet A system of naming chemicals 1800 Proust Law of...
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  • Joseph Proust Biography
    Joseph Louis Proust was born on September 26, 1754 in Angers, France. Though there is not much information about his family, his father and Joachim, his brother, were pharmicists. Other than being a chemist, Joseph was a teacher at the Chemistry School in Segovia and at the University of Salamanca...
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  • Physics Timeline
    proposes in a newspaper article that an electric current affects a magnetic current. His discovery is largely ignored. Oersted, a better known scientist, would discover the same phenomenon in 1819. | 1804 | Joseph Louis Gay-Lussac, without knowledge of Charles' work of 1787, discovers the...
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  • Term Paper
    , formulated by Antoine Lavoisier in 1789, which states that the total mass in a chemical reaction remains constant (that is, the reactants have the same mass as the products). The second was the law of definite proportions. First proven by the French chemist Joseph Louis Proust in 1799, this law...
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  • rosana
    science: Developed the Bohr model of the atom. Developed the correspondence principle, the basic tool of Old quantum theory. 2)English physicist Isaac Newton's contributions to science: Developed calculus. Developed theory of universal gravitation. 3)French chemist Louis Pasteur's...
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  • Chemist
    . Avogadro developed this hypothesis after Joseph Louis Gay-Lussac had published in 1808 his law on volumes (and combining gases). The greatest problem Avogadro had to resolve was the confusion at that time regarding atoms and molecules. One of his most important contributions was clearly...
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  • The Atom
    has the same relative number and kinds of atoms * From the Law of Constant composition developed by Joseph Proust (1799) 4. All atoms of a given element are identical, but they differ from those of any other element 5. Compounds are formed when atoms of more than one element combine...
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  • Tak's Data
    a theoretical foundation for determining accurate atomic and molecular masses. The concept of a mole did not even exist in Avogadro's time. Much of Avogadro's work was based on that of Joseph-Louis Gay-Lussac (1778–1850). Gay-Lussac developed the law of combining volumes that states: "In any...
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  • French People
    : “Every reader finds himself. The writer's work is merely a kind of optical instrument that makes it possible for the reader to discern what, without this book, he would perhaps never have seen in himself.” His full name was Valentin Louis Georges Eugène Marcel Proust; he was born in Auteuil...
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  • Atomic Theory
    element 5. 1794 Joseph Proust * Through quantitive experimentation he discovered Law of Definite Composition 6. 1803 John Dalton * Determined elements atomic weight * Postulated law of multiple proportions * Proposed 1st formal atomic theory * Believed atoms were all hard...
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  • Brief Historical Development and Contributions of Chemistry for Modern Civilization
    Brief Historical Development and Contributions of Chemistry for Modern Civilization Introduction: As defined by Oxford Dictionary, Chemistry is the scientific study of the structure of substances, how they react when combined or in contact with one another and how they behave under different...
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  • Nice ituu
    ) "pushed" the idea of discrete valence bonds. It was actually Jacobus H. van't Hoff (Netherlands; 1852-1911) and Joseph A. Le Bel (France; 1847-1930) who deduced that when carbon appeared in organic compounds, it was connected to four other atoms and the shape of teh atoms around carbon was...
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  • Atoms 2
    spin consisted of a fourth quantum number: electron spin (s). In 1924 a Frenchman named Louis de Broglie thought about particles of matter. He thought that if light can exist as both particles and waves, why couldn't atom particles also behave like waves? In a few equations derived from Einstein's...
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  • Father Mother
    ------------------------------------------------- Natural sciences[edit source | editbeta] Biology[edit source | editbeta] Subject | Father/mother of … | Reason | Bacteriology | Robert Koch, Ferdinand Cohn, Louis Pasteur[1] (founders) Antonie van Leeuwenhoek[2] | For their studies and...
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  • Development of the Atomic Model
    A.D. – age of alchemy Late 1700’s – law of conservation of mass – mass doesn’t change during a chemical reaction 1799 – Proust – law of constant composition – compounds always have same proportion by mass of their elements 1766-1844 John Dalton (English) postulates atoms as a billiard ball...
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  • Mrtp Act
    French chemist, Joseph Proust. He stated that a given compound always contains exactly the same proportion of elements by weight. Proust worked with two Joseph Proust (1754—1826) samples of cupric carbonate — one of which was of natural origin and the other was synthetic one. He found that the...
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  • History of Atomic Theory
    : Joseph Proust, French Chemist: Stated that different samples of the same compound always contain its’ constituent elements in the same proportion by mass. - If you get water from anywhere it is all going to be the same. It is going to be H20. Law of Multiple Proportions: John Dalton: Stated that...
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  • Atomic Structure Notes
    Atomic structure: scientists 1. Democritus: 1st person to think of atom (500 BCE)- philosopher Atom is the smallest piece of an element that has same properties as the element. 2. Lavisier: Law of conservation of mass/ matter • Mass can’t be created or destroy; same amount of stuff 3. Joseph...
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  • Common Laboratory Operations
    was her partial proof of Fermat's last theorem. She made important contributions in several areas of mathematics in spite of the rules and prejudices barring woman from academic life. she was awarded a prize by the institut de France, for the work on a mathematical theory of elasticity. Sreenivasa...
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  • Determination of the Emprical Formula of the Silver Oxide
    compound, and this is way is known to be the simplest way of describing the composition of a substance. In the law of definite proportions, formulated by Joseph Proust, the elements in a compound are always there in the same way by mass, no matter what the source of the compound or how it was...
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