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Democritus, Aristotle, & John Dalton

Democritus, Aristotle, & John Dalton. By: Allison Pucci, Carina D’Amato, Mike Condon, Dan Skowronek, Jessica Sampson. Who was Democritus?. Greek philosopher (460-370 B.C) 1 st person to propose the idea that matter wasn’t infinitely divisible.

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Democritus, Aristotle, & John Dalton

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  1. Democritus, Aristotle, & John Dalton By: Allison Pucci, Carina D’Amato, Mike Condon, Dan Skowronek, Jessica Sampson

  2. Who was Democritus? • Greek philosopher (460-370 B.C) • 1st person to propose the idea that matter wasn’t infinitely divisible. • acquired fame with his knowledge of natural Phenomena, and predicted weather change • main interests: metaphysics, mathematics, and astronomy

  3. Democritus’ Theory • expanded the atomic theory of Leucippus • matter made up of tiny particle were called atoms • atoms couldn’t be created, destroyed, or further divided • had an idea, but couldn’t support his theory • said the small pieces of matter that you couldn’t divide any smaller were called atomos, which means indivisible

  4. Evidence on his Theory • There was no evidence on Democritus’ theory because he couldn’t support his theory.

  5. Who was Aristotle? • Greek philosopher (384-322 B.C.) • Main interests: politics, metaphysics, science, logic, and ethics • Influences: Parmenides, Socrates, and Plato

  6. Aristotle’s Theory • Disagreed with Democritus’ idea of matter • Believed empty space didn’t exist • Believed matter is made of earth, fire, air, and water

  7. Evidence of his Theory • Got everyone to believe it, but he had no evidence

  8. Who was John Dalton? • School teacher in England; taught Chemistry • Lived from 1766-1844 • Thought about taking up law or medicine • Recorded weather in his hometown regularly

  9. John Dalton’s Theory • Ideas similar to Democritus • Took Democritus’ theory and tried proving it true • Dalton’s Atomic Theory (see handout) • Theory supports conservation of mass • However, not all of it was true • Thought that atoms couldn’t be broken down into smaller parts (protons, neutrons, and electrons) • Didn’t know that atoms of an element could have different properties (mass)

  10. Evidence of his Theory • Studied numerous chemical reactions • Made observations and measurements along the way • Able to determine the mass ratios of the elements involved in those reactions • Results are known as Dalton’s atomic theory.

  11. Citation Page • Buthelezi, Thandi, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom, and Dinah Zike. Chemistry Matter and Change. New York: Glencoe, 2008. 102-104. • "Democritus." 20 Oct. 2007. Wikepedia. 21 Oct. 2007 <http://en.wikipedia.org/wiki/Democratus>. • "John Dalton." Wikepedia. 19 Oct. 2007. Wikepedia. 21 Oct. 2007 <http://en.wikipedia.org/wiki/John_Dalton>. • Anthony Carpi, Ph.D. "Matter: Atoms from Democritus to Dalton," Visionlearning Vol. CHE-1 (1), 2003.http://www.visionlearning.com/library/module_viewer.php?mid=49

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