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Unit 3 (Ch. 4) Reading Guide (not sections 8, 9 or 11) Name: _______________________
1. List 2 applications of Chemistry used before 1000 B.C.E.
2. What did the Greeks believe all matter was composed of around 400 B.C.E.?
3. All matter can be broken down to about ____________ different elements.
4. How many elements occur naturally? __________
5. How are the rest made?
6. List the origin of the names for at least 2 elements.
7. In writing element symbols, the first letter must be ___________ the second is ___________
Write symbols for sulfur: cobalt: copper: potassium:
8. Write a chemical formula. Explain each part (letters and numbers).
9. History and Models
Name Date Experiment/Observation Major Contribution/Discovery
Democritus 400BCE philosophized “atomos”= indivisible
John Dalton
J.J. Thomson (p. 81 and 83)
Ernest Rutherford
Chadwick XXXXXXXXXXXXXXXXXXXX
10. Models (draw each model and label with the approximate date, explain major characteristicsof each model)
Dalton (Ball Bearing) Thomson (Plum Pudding) Rutherford (Nuclear/Planetary)p. 81 p. 81 p. 82-84 + p.303-304
11. Define the following:
Isotopes:
Atomic Number:
Mass Number:
Ion:
Cation:
Anion:
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