Download atomic theory webquest[1].

Adventures in Atomic Theory
name_______________________
Read through the web sites and answer the following:
Go to http://en.wikipedia.org/wiki/Democritus
1) What did Democritus believe about matter?
2) What word do we get from his description?__________
3) When did he do this (during what timeframe did he live)?______________
Go to http://library.thinkquest.org/3659/atommole/atoms.html
1) When did John Dalton originate the idea of an atomic theory? _________________
2) What are two laws of chemical combination? Law of ____________________________
Law of ____________________________
3) What were John Dalton’s basic ideas about matter (skip step 4?
1)_________________________________________________________________
2)_________________________________________________________________
3)_________________________________________________________________
4)_________________________________________________________________
_________________________________________________________________
Go to http://www.rsc.org/chemsoc/timeline/pages/1803.html
Sketch a drawing of Dalton ’s idea of an atom. (draw one atom- the picture shows multiple atoms)
-------------------------------------------------------------------------------------------------------------------------------Go to http://www.aip.org/history/electron/jjhome.htm
1) What British physicist was studying the inside of the atom?
2) How long ago did he do this?
3) Through his experiments with electricity and cathode rays, what did he discover about these
rays?
4) How did this discovery disprove Dalton’s idea of the atom?
5) What are cathode rays made up of?
What causes the bending of the cathode ray? ____________________________
Go to http://ffden-2.phys.uaf.edu/212_fall2003.web.dir/Ryan_McAllister/Slide3.htm
1) Who performed the oil drop experiment?
2) When? _________
3) What did he discover?
Go to http://physics.wku.edu/~womble/phys260/millikan.html
to perform a demo of the oil drop experiment.
4) How did this experiment further disprove Dalton ’s ideas?
Go to http://www.universetoday.com/38326/plum-pudding-model/
Sketch a picture of the atom at this time. What is the name of this model? ___________________
---------------------------------------------------------------------------------------------------------------------------------Go to
http://undsci.berkeley.edu/lessons/pdfs/rutherford.pdf
and http://www.mhhe.com/physsci/chemistry/essentialchemistry/flash/ruther14.swf
1) When did Ernest Rutherford perform his experiment?___________
2) How did Ernest Rutherford perform his experiment?
3) When the alpha particle bounced off the gold nucleus, what conclusion can be made about the atom?
4) How does this discovery disprove Dalton ’s idea about the atom?
Sketch a picture of Rutherford ’s Planetary Model of the atom.
Try the demo of Rutherford’s experiment at http://micro.magnet.fsu.edu/electromag/java/rutherford/
---------------------------------------------------------------------------------------------------------------------------------Go to http://csep10.phys.utk.edu/astr162/lect/light/bohr.html
1) When did Niels Bohr propose his theory about the atom?___________
Sketch a drawing of the Bohr atomic model of the atom.
The correct theory of the atom is called q____________ m______________
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Go to http://www.helium.com/items/216709-james-chadwick-and-his-discovery-of-theneutron
1) What did Sir James Chadwick discover about the atom?
2) In what year did he make this discovery?
3) Before this time, what particles were believed to exist in the atom?
4) How does the neutron affect an atom of an element?
(From Chadwick)
If you had trouble finding any answers: go to this link: http://home.utah.edu/~msm25/webquest/process.html
It summarizes many of the theories well.