An Internet-Based Treasure Hunt

     "The particle theory of matter was supported as early as 400 B.C. by certain Greek thinkers, such as Democritus. He called nature's basic particle an atom, based on the Greek word meaning "indivisible." Aristotle was part of the generation that succeeded Democritus. His ideas had a lasting impact on Western civilization, and he did not believe in atoms. He thought that all matter was continuous, and his opinion was accepted for nearly 200 years. Neither the view of Aristotle nor that of Democritus was supported by experimental evidence, so each remained speculation until the eighteenth century. Then scientists began to gather evidence favoring the atomic theory of matter".
     Use the Internet resources to answer the 10 main Questions. After answering these 10 main questions, answer the Big Question that asks you to combine as much of what you learned into a "big picture."

1. Describe the contributions made by Democritus to the atomic theory.
2. What four elements did Aristotle believe made up matter and how did they relate to each other?
3. State Lavoisier's Law of Conservation of Matter and how it relates to Aristotle's phlogiston theory.
4. Summarize Dalton's atomic theory and compare it to those developed earlier .
5. Explain Dalton's Law of Definite Proportions.
6. Give a brief explanation of how the cathode ray tube led to the discovery of the electron.
7. Explain how Millikan's "Oil Drop" experiment was relevant to the development of the modern atomic theory.
8. Describe the experiment that led to the discovery of the nucleus of an atom.
9. Give a brief description and draw a model of Bohr's atom .
10. Describe the modern atomic theory.

Create a PowerPoint presentation with a minimum of five (5) slides to briefly illustrate the historical development of the modern atomic theory.

• Birth of the Atom
• Evolution of Atomic Concept
• Conservation of Mass-Energy
• A. Lavoisier
• Aristotle
• http://antoine.fsu.umd.edu/chem/senese/101/atoms/dalton.shtml
• Laws of Definite proportions/Multiple proportions
• Discovery of the Electron
• Millikan's oil drop Experiment
• Oil drop simulation
• Chemistry animation
• Niels Bohr
• Bohr and other relevant scientists

• Davis, R.E., Metcalfe, H.C., Williams, J.E., & Castka, J.F. Modern Chemistry. Holt, Rinehart and Winston: Austin, 2002.
• www.flamingtext.com
• Atom.[Online image] Available: http://www.iop.org/Physics/Electron/Exhibition/images/atom.jpg , Jun 05, 2002