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Name ___________________________________ Date _______________________ Block _______ Webquest: Atomic Theories and Models Answer these questions on your own, USING COMPLETE SENTENCES where appropriate (most of the questions, except tables and drawings). Atom Basics: Go to: http://www.chemtutor.com/struct.htm and read the “And you thought you were strange” section to answer the following questions (put answers in the table). 1. What are the three subatomic particles that all atoms are made of? 2. Where are each of the three particles located within the atom? 3. What is the electrical charge of each particle? 1. The 3 subatomic particles 2. Location within the Atom 3. Electrical Charge Early Ideas About Atoms: Go to http://galileo.phys.virginia.edu/classes/252/atoms.html and read the section on “Early Greek Ideas” in order to answer the following questions: 4. What was the “basic idea” about matter that Leucippus and Democritus proposed? 5. How did they use atoms to explain different physical properties? 6. Summarize the quote from Lucretius. What common phenomenon do we see everyday that he was describing? Now go to the class website (http://web.bend.k12.or.us/andrew.young/MVHSChem/Chemistry/Entries/2012/10/4_Assignm ents.html) and click on “Democritus” in the Assignments section. 7. Aristotle’s ideas of what “elements” made up matter ended up holding more sway for the next 2000 years. Can you think of what “elements” he was talking about? Differentiate between Aristotle’s “elements” and Democritus’ atoms. Which seems more logical? John Dalton’s Atomic Theory: Go to the class website (http://web.bend.k12.or.us/andrew.young/MVHSChem/Chemistry/Entries/2012/10/4_Assignm ents.html) and click on “John Dalton” in the Assignments section. Use the information there to answer the following question: 8. What are the 5 main tenets of Dalton’s Atomic Theory? J.J. Thomson and the Electron: Go to http://en.wikipedia.org/wiki/Plum_pudding_model and use the information there to answer the following questions: 9. What was the basic gist of J.J. Thomson’s Plum Pudding model? 10. Go to the class website (http://web.bend.k12.or.us/andrew.young/MVHSChem/Chemistry/Entries/2012/10/4_Assignm ents.html)and click on “JJ Thomson” in the Assignments section. How did Thomson’s experiment lead to the discovery and understanding of electrons? Rutherford and Bohr Break the “Plum Pudding” Model: Go to http://profmokeur.ca/chemistry/history_of_the_atom.htm and use the videos describing Rutherford’s experiment and the Bohr model to answer the following questions. 11. Draw a picture to describe Rutherford’s experiment. What mind‐blowing (for the time) revelation did his experiment reveal about the relative size of atoms and their nuclei? Picture: Answer: 14. How did Bohr modify this model of the atom (i.e. what was his “revolutionary idea” about electrons)?
