The chemists


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The chemists

  1. 1. Contributions of Scientists to Chemistry
  2. 2. <ul><li>26 August 1743 – 8 May 1794 </li></ul><ul><li>Father of Modern Chemistry </li></ul><ul><li>Stated the first version of Law of Conservation of Mass </li></ul><ul><li>Demonstrated the role of Oxygen in rusting of metals </li></ul><ul><li>Role of oxygen in animal and plant respiration </li></ul><ul><li>Recognized and named the gases Oxygen and Hydrogen </li></ul>
  3. 3. <ul><li>Wrote the first extensive list of elements </li></ul><ul><li>Pioneered Stoichiometry “Quantitative Chemistry” </li></ul><ul><li>Determined the components of water </li></ul><ul><li>Determined the primary gases of air which is primarily Nitrogen and Oxygen </li></ul><ul><li>Explained the true nature of combustion. Disproving the “Phlogiston Theory” </li></ul><ul><li>Helped construct the metric system </li></ul>
  4. 5. <ul><li>6 September 1766 – 27 July 1844 was an English chemist, meteorologist and physicist </li></ul><ul><li>Dalton proceeded to print his first published table of relative atomic weights </li></ul><ul><li>Six elements appear in this table, namely hydrogen, oxygen, nitrogen, carbon, sulfur, and phosphorus, with the atom of hydrogen conventionally assumed to weigh 1 </li></ul>
  5. 6. <ul><li>He is best known for his pioneering work in the development of modern atomic theory </li></ul><ul><li>Author of Dalton’s Law of Partial Pressure </li></ul><ul><li>states that the total pressure exerted by a gaseous mixture is equal to the sum of the partial pressures of each individual component in a gas mixture </li></ul>
  6. 8. <ul><li>23 November 1887 to 10 August 1915 </li></ul><ul><li>Was an English physicist. </li></ul><ul><li>Observed and measured the X-ray spectra of various chemical elements (mostly metals) that were found by the method of diffraction through crystals. </li></ul><ul><li>sorted the chemical elements of the Periodic Table of the Elements in a quite logical order based on their physics. </li></ul>
  7. 10. <ul><li>30 August 1871–19 October 1937 </li></ul><ul><li>was a British-New Zealand chemist and physicist who became known as the father of nuclear physics </li></ul><ul><li>He discovered the concept of radioactive half life, proved that radioactivity involved the transmutation of one chemical element to another </li></ul>
  8. 11. <ul><li>Differentiated and named alpha and beta radiation. </li></ul><ul><li>Postulated that atoms have their positive charge concentrated in a very small nucleus </li></ul><ul><li>Pioneered the Rutherford model, or planetary, model of the atom through his discovery and interpretation of Rutherford scattering in his gold foil experiment. </li></ul>
  9. 13. <ul><li>8 February 1834 – 2 February 1907 </li></ul><ul><li>Was a Russian chemist and inventor.  </li></ul><ul><li>He is credited as being the creator of the first version of the periodic table of elements. </li></ul><ul><li>He predicted the properties of elements yet to be discovered. </li></ul><ul><li>The Dependence between the Properties of the Atomic Weights of the Elements </li></ul><ul><li>Described elements according to both atomic weight and valence. </li></ul>
  10. 15. <ul><li>August 19, 1830 - April 11, 1895 </li></ul><ul><li>Was a German chemist. </li></ul><ul><li>He was contemporary and competitor of Dmitri Mendeleev to draw up the first periodic table of chemical elements. </li></ul><ul><li>That if they are arranged in the order of their atomic weights they fall into groups in which similar chemical and physical properties are repeated at periodic intervals </li></ul>
  11. 17. <ul><li>27 March 1845 – 10 February 1923 </li></ul><ul><li>was a German physicist </li></ul><ul><li>on 8 November 1895, He was able produced and detected electromagnetic radiation in a wavelength range today known as x-rays or Roentgen rays. </li></ul><ul><li>An achievement that earned him the first Nobel Prize in Physics in 1901 </li></ul>