Essay on The History of Chemistry

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Chemistry has been around for a very long time. Chemistry dates back to as far as the prehistoric times. If you put the amount of time chemistry takes up in a timeline, you would split it into four general categories. The four categories are: prehistoric times - beginning of the Christian era (black magic), beginning of the Christian era - end of 17th century (alchemy), end of 17th century - mid 19th century (traditional chemistry), and mid 19th century - present (modern chemistry). It starts in the beginning of the Christian era (black magic). In 1700 BC, when known metals were first recorded and listed. In 430 BC, Democritus proclaimed the atom to be the simplest form of matter, which is composed of atoms. In 300 BC, Aristotle…show more content…
He named the “dephlogisticated air” oxygen when he realized oxygen combines with substances as the burn. Lavoisier is now called the “Father of Modern Chemistry” because of his attributions. In 1803, John Dalton’s Atomic Theory states that all matter is composed of atoms, which he discovered are small and indivisible. The last era is the mid 19th Century- 20th Century (Modern or Present day). In 1854, Heinrich Geissler creates the first vacuum tube. In 1879, William Crookes used the vacuum tube to discover cathode rays. Crookes’ glass vacuum tube had a zinc sulfide coating on the inside of one end and a metal cathode imbedded on the other end. When electricity runs through the apparatus, the zinc sulfide glows. Crookes hypothesized that the rays caused the zinc sulfide to fluoresce, which are called cathode rays. In 1885, Eugene Goldstein discovered positive particles by using a tube filled with hydrogen gas. The particle had charge equal and opposite to the electron. The positive particle was later named a proton. In 1895, while researching the glow produced by cathode rays, Wilhelm Roentgen had accidentally discovered x-rays. During his research on cathode rays, he noticed that a bottle of barium platinocyanide was glowing on a shelf. The fluorescence, he discovered, could also pass through glass, cardboard, and walls. The rays were called x-rays. In 1896, Henri Becquerel was studying the fluorescence of pitchblend. He discovered that
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