Chemistry in the past
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Chemistry in the past

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Chemistry in the past Presentation Transcript

  • 1. Chemistry in the Past Paragraph #1
  • 2. Chemistry is an oldscience. People were alwaysinterested in chemicals.
  • 3. Source of picture: http://www.levity.com/alchemy/derstrae.htmlPeople who workedon chemicals beforethe 1700’s werecalled alchemists.Their kind ofchemistry was calledalchemy.
  • 4. They had some strange ideas. Forexample, they believed they couldmake gold by mixing together theright things. For hundreds ofyears, alchemists tried to do this.Of course, no one ever made goldthis way.
  • 5. What is the main idea in thisparagraph?a. Alchemists never made gold.b. Alchemists lived before the 1700’s.c. Alchemists studied chemicals instrange ways.
  • 6. What is the main idea in thisparagraph?a. Alchemists never made gold.b. Alchemists lived before the 1700’s.c. Alchemists studied chemicalsin strange ways.
  • 7. Chemistry in the Past Paragraph #2
  • 8. Source of picture: http://www.th.physik.uni-frankfurt.de/ ~jr/gif/phys/boyle.jpg Robert Boyle (1627-1691) is sometimes called the“father of chemistry.”He started out as an alchemist, but hebegan to think in a different way.
  • 9. For example,alchemiststhought thateverythingwas made outof fourthings—earth,air, fire andwater,
  • 10. but Boylefound thatthings aremade up ofmanydifferentelements.
  • 11. In fact, he wrote a definition ofwhat an element is. He saidthat an element is somethingthat cannot be broken downinto smaller parts. Boyle’s workmarked the end of alchemy asa science.
  • 12. Boyle’s chemistryequipmentSource of image:http://www.stanford.edu/class/history34q/readings/ShapinSchaffer/AirPump.jpeg
  • 13. What is the main idea in this paragraph?a. Robert Boyle helped build the science ofalchemy.b. Robert Boyle said everything is made offour elements.c. Robert Boyle helped to start the scienceof chemistry.
  • 14. What is the main idea in this paragraph?a. Robert Boyle helped build the science ofalchemy.b. Robert Boyle said everything is made offour elements.c. Robert Boyle helped to start thescience of chemistry.
  • 15. Chemistry in the Past Paragraph #3
  • 16. Antoine Lavoisier (1743-1794) is important in thehistory of modern chemistry. In about 1776, hebegan to use a new way to study chemicals.
  • 17. Before Lavoisier, scientists justlooked at something and thoughtabout it. However, Lavoisier didexperiments. He studied the sizeand weight of many differentthings. He found out somethingimportant.
  • 18. He found out thatnothing really goesaway. It just changesinto something else.
  • 19. For example,when waterboils, itdoesn’t goaway. Itbecomessteam, a cloudof water. Thiswas animportant ideafor the futureof chemistry.
  • 20. What is the main idea in this paragraph?a. Antoine Lavoisier used experiments tostudy chemicals.b. Antoine Lavoisier studied the size andweight of water.c. Antoine Lavoisier lived in the 1700’s
  • 21. What is the main idea in this paragraph?a. Antoine Lavoisier usedexperiments to study chemicals.b. Antoine Lavoisier studied the size andweight of water.c. Antoine Lavoisier lived in the 1700’s