Download Webquest: Atomic Theories and Models – an Historical Work in

Webquest: Atomic Theories and Models
2015
Answer these questions on your own sheet of paper, USING COMPLETE SENTENCES, where
appropriate (most of the questions, except tables and drawings).
Atom Basics: Go to: http://www.chem4kids.com/files/atom_structure.html 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://northspringer.tripod.com/HistoryofAtom/index.html and read the section on “Early Greek Ideas” in
order to answer the following questions:
1. What was the “basic idea” about matter that Leucippus and Democritus proposed?
2. What are the 5 main points of their theory?
John Dalton’s Atomic Theory
Go to http://dl.clackamas.edu/ch104-04/dalton’s.htm and use the information found there to answer the
following questions:
3.
4.
5.
6.
7.
When did Dalton develop his atomic theory?
What did Dalton say is the reason an element is pure?
How did Dalton explain differences between elements?
What support did Dalton have for his theory that compounds have a constant composition? (2 important parts.)
What is the difference between a theory of atoms, and a model of atoms?
J.J. Thomson and the Electron
Go to https://www.chemheritage.org/historical-profile/joseph-john-“j-j”-thomson and use the information there to
answer the following questions:
8. What is the year in which J.J. Thomson discovered the electron?
9. What was the evidence for “bodies much smaller than atoms”?
10. What was his model of the atom?
Click the following link and scroll down to JJ Thomson’s Model of the Atom:
http://www.emsb.qc.ca/laurenhill/science/models.html
11. What “name” is given his model? _________________ . SKETCH and label his model on your poster.
12. What type of rays did he use to determine the presence of electrons?
13. What experiment did he do?
Rutherford
Click the following link scroll down to Rutherford: http://www.emsb.qc.ca/laurenhill/science/models.html
15. How did Rutherford describe the atom?
16. What experiment did he do? Describe the experiment.
*This must be done on a computer* Click the following link:
http://www.mhhe.com/physsci/chemistry/essentialchemistry/flash/ruther14.swf
Listen to the instructions.
17. After hearing about the results of the gold foil experiment, explain the experiment’s findings.
18. Click on “Rutherford’s model”, listen to the description and draw his model on your poster.
And then visit http://www.iun.edu/~cpanhd/C101webnotes/modern-atomic-theory/Bohr-model.html and answer these
questions:
19. What was the problem with Rutherford’s model that led Bohr to develop his model?
Bohr
Go to http://www.emsb.qc.ca/laurenhill/science/models.html and use the information found there to answer the
following questions.
20. What problems did Bohr find with Rutherford’s theory?
21. How did Bohr modify Rutherford’s model of the atom?
22. What does the energy of the electron depend on?
23. Include the picture of the Bohr atom.
And then visit http://www.iun.edu/~cpanhd/C101webnotes/modern-atomic-theory/Bohr-model.html and answer these
questions:
24. List the four principles of Bohr’s model.
25. What did Bohr explain with these conditions?
Chadwick (and Rutherford) and the Neutron
Go to http://www.pbs.org/wgbh/aso/databank/entries/dp32ne.html and use the information found there to answer the
following questions:
26. What makes up the atomic number?
27. What makes up the atomic mass?
28. What observation led Chadwick (and Rutherford) to conclude there must be something besides just the proton in
the nucleus of atoms?
29. What is the something-besides-just-the proton called?
Edwin Schrodinger
Go to http://chemed.chem.purdue.edu/genchem/history/schrodinger.html and use the information found there to answer
the following questions:
30.
31.
32.
33.
What does Schrödinger say electrons really are?
Where does Schrödinger say electrons are located?
Does Schrödinger say that we can ever really predict where electrons will be?
If not, what does he say is the best we can do?
History of the Atom Timeline
Click the following link:
http://www.cerritos.edu/ladkins/a106/A%20Brief%20History%20of%20the%20Atom.htm Use the
information in this web page to fill in your History of the Atom Timeline. Use the following clues to help
you. Make sure that all of the dates and all of the inventors are filled in.
Hints
1. My famous quote was disputed by Aristotle, although time proved me correct.
2. In what date was it determined that matter can neither be created nor destroyed. Name the date
and the scientist
3. Name the date and inventor of the modern version of the Atomic Theory
4. I was born in 1831 and showed that electricity and magnetism are scientifically related.
5. he developed the plum pudding model and also was the first to discover the
.
6. In 1909 this scientist demonstrated that the atom is mostly empty space with a small positively charged
nucleus containing most of the mass and low mass negatively charged particles orbiting this nucleus. He
was also credited with naming and
.
7. What date did Neils Bohr develop the first successful model of the atom?
History of the Atom Timeline
1
2
3
4
5
6
7
Discovery:
Date:
400 BC
1831
Inventor:
HONOR CODE: On my honor, I have neither given nor received unauthorized assistance on this
assignment. This work is 100% completed by myself and was not shared with any other students.
Signature:
Bohr