WS - Atom Webquest KEY | Electron | Atoms

September 17, 2017 | Author: Anonymous | Category: IDE
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Atomic Theory and Model WebquestSection 1: Atomic Thoughts – Democritus (http://www.universetoday.com/60058/democritus...

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Atomic Theory and Model Webquest Section 1: Atomic Thoughts – Democritus (http://www.universetoday.com/60058/democritus-atom/) 1. When did Democritus live? 460-370 BC 2. What makes up everything accord to Democritus? Atoms

Section 2: Advanced Atomic Thoughts – John Dalton  Read http://chemed.chem.purdue.edu/genchem/history/dalton.html  Read http://www.iun.edu/~cpanhd/C101webnotes/composition/dalton.html  Read http://www.chemicalformula.org/chemistry-help/models-of-the-atom (look for John Dalton) 3. What year was John Dalton’s Atomic Theory released? Summarize (in your own words) the FIVE parts to Dalton’s Atomic Theory. 1803  Everything is made up of atoms  Atoms of the same element are the same  Atoms of different elements are different  Atoms combine in simple ratios to form compounds  Atoms can’t be created or destroyed

4. What are two problems with Dalton’s Atomic Theory today? Atoms can be destroyed. Isotopes exist

5. What was John Dalton’s model of the atom called? Billiard Ball Model

6. What year did he propose his atomic model? About many years is this from Democritus? 1808, ~2400 years

Section 3: Experimental Beginnings of the Atom – J.J. Thomson  Read http://www.chemteam.info/AtomicStructure/Disc-of-ElectronImages.html  Read http://www.chemicalformula.org/chemistry-help/models-of-the-atom (look for Thomson) 7. “Atoms are small, indivisible particles. There is nothing smaller than an atom.” Why would Thomson disagree with this statement? He discovered electrons that are smaller than the atom. 8. What subatomic particle did Thomson first discover? Electrons

9. What is the name of Thomson’s model of the atom? What year did he propose it? 1903, Plum pudding 10. What is the name of the main piece of equipment used by Thomson? Do some research on this equipment. What is it commonly found in today? Cathode Ray Tube – TV’s

Section 4: Advanced Experimenting – Ernest Rutherford (http://myweb.usf.edu/~mhight/goldfoil.html) 11. Foil

What was the name of Rutherford’s most famous experiment? Gold

12.

Describe and/or illustrate what Rutherford’s experiment looked like.

13. What did Rutherford conclude was in the middle of the atom? Small, dense center of mass that was positively charged – the nucleus

14. J.J. Thomson said the atom is filled with “positive sea” with small, negative particles called electrons. Would Rutherford agree or disagree with this statement? Why? Disagree, there is no positive sea. The atom is mostly empty space with small positive nucleus. Section 5: Bohring Atoms – Niels Bohr ( http://www.pbs.org/wgbh/aso/databank/entries/bpbohr.html) 15. Opposites attract. Should spinning negative electrons be attracted to the nucleus? YES – but they never stop spinning around! How did Bohr explain this? (3rd Paragraph) Electrons are arranged on set levels of energy and can move back and forth. 16. What happens to an electron’s location when it absorbs energy? What happens when it radiates energy? Absorbs – go to higher energy level. Radiates - go to lower energy level. Section 6: Quantum Mechanical Model/Electron Cloud Model Read http://www.sparknotes.com/testprep/books/sat2/chemistry/chapter4section4.rhtml 17. Describe the main difference regarding electron location in the Bohr model vs. the current Quantum Model. Electrons are in diffuse clouds 18. Describe Werner Heisenberg’s Uncertainty Principle. How does this help explain current thoughts about electron location in the Quantum Model? You can never be sure of an electron’s location; only the probability of finding an electron. Electrons aren’t in hard, defined levels of location, but instead in a cloud.

Section 7: Misc. Factoids (Chadwick) 19. James Chadwick is credited with discovering which subatomic particle? Neutron 20. Robert Millikan discovered something pretty important about the electron.  View Video at http://cleanvideosearch.com/media/action/yt/watch? videoId=XMfYHag7Liw  What was his experiment called? Oil Drop Experiment

 What did he discover about the electron? Charge Timeline – use guide at http://www.chemicalformula.org/chemistry-help/modelsof-the-atom Create a timeline with the following models: Dalton, Thomson, Rutherford, Bohr, and Quantum. Illustrate the models pictorially. You may draw or use the computer. Include:  Names of discover and model name Turn in Finished  Picture of the Atom Timeline! Each  The year of discovery/release person in the group  The significant difference between one model and theshould next turn in their own unique version.

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