Bicentenario

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HOMEWORK 2 THE CHEMICAL ELEMENTS
1.- Investigate the chemical composition (%) of each element in:
The universe: • 4%: Proportion of the universe that is ordinary matter
• 23%: Proportion thatis dark matter
• 73%: Proportion that is dark energy
The earth crust:
Component Symbol Volume
Oxygen
O 46.6%
Silicon Si 27.8%
Aluminum Al 8.1%
Iron Fe 5.0%
Calcium Ca 3.6%
Sodium Na 2.8%Potassium K 2.6%
Magnesium Mg 2.0%
others 1.6%

The air:Nitrogen—N2 -- 78.084%
Oxygen—O2 -- 20.9476%
Argon—Ar -- 0.934%
Carbon Dioxide—CO2 -- 0.0314%
Neon—Ne -- 0.001818%
Methane—CH4 --0.0002%
Helium—He -- 0.000524%

The organisms (the cell): Hydrogen, oxygen, nitrogen, carbon, sulfur, and phosphorus normally makeup more
than 99% of the mass of living cells.
Ocean water:
gasmolecule % in
atmosphere % in surface
seawater ml/litre
sea water mg/kg (ppm)
in sea water molecular
weight mmol/
kg
Nitrogen N2 78% 47.5% 10 12.5 28.014 0.446
Oxygen O2 21% 36.0% 5 731.998 0.219
Carbondioxide CO2 0.03% 15.1% 40 90 * 42.009 2.142
Argon 1% 1.4% . 0.4 39.948 0.01

2.- Origin of the elements´ names.
Remember:
o The origin of the elements names may vary, due tothey come from different sources, such as place, person, celestial bodies, properties, Gods, mythology concepts, etc.
o The chemical symbol can be formed with 1, 2 or 3 letters, but it must beginwith a capital letter and must end with a lower case.
o Names and symbols derive from Latin, Greek, Arabic, German, English, Anglo-Saxon, etc.

1.- Investigate 3 elements which name derives from aplace.: Actinium, greek- Argon, greek- Cadmium. Greek.
2.- Investigate 3 elements which name derives from a person (scientist) Bohrium, niels bohr- Berkelium, George Berkley- Copernicium, NicolasCopernicus
3.- Investigate 3 elements which name derives from a mythology concept ANITONOMY, CAESIUM, COBALT
4.- Investigate 3 elements which name derives from a celestial body ARSENIC, BERYLIUM,...
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