Noun
- A nonmetallic element (symbol Si) with an atomic number of 14 and atomic weight of 28.0855.
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...Silicon ( or , ) is the most common metalloid. It is a chemical element, which has the symbol Si and atomic number 14. A tetravalent metalloid, silicon is less reactive than its chemical analog carbon. As the eighth most common element in the universe by mass, silicon very rarely occurs as the pure free element in nature, but is more widely distributed in dusts, planetoids and planets as various forms of silicon dioxide (silica) or silicates. In Earth's crust, silicon is the second most abundant element after oxygen, making up 25.7% of the crust by mass. Read full entry
This entry is from Wikipedia,the leading user-contributed encyclopedia.It may not have been reviewed by professional editors(See full disclaimer)
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- 1.Silicon - Wikipedia, the free encyclopedia
- A tetravalent metalloid, silicon is less reactive than its chemical analog carbon. ... On Earth, silicon is the second most abundant element (after oxygen) in the ...
- http://en.wikipedia.org/wiki/S
ilicon
- 2.Silicon
- History, sources, uses, and properties. ... Silicon is not found free in nature, but occurs chiefly as the oxide and as silicates. ...
- http://periodic.lanl.gov/eleme
nts/14.html
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Silicon???
Why is silicon used in the
production of solar cells?
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its insulation so that each individual cell doesnt touch eachother and short out the electrical components |
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Is the a silicon made that is I have a marble shower and am
looking for a silicon or a
sealer that I can use around
the corners and molding that
is water resistant and mildew
resistant. I was thinking
about a marine type silicon.
Will this work?
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Yes...you can fine all kinds of sealer and silicone in you hardware store that state on the side they are mildew resistant. One thing you need to do is make sure they is no mold or mildew already there on the surface before you seal it...otherwise you are sealing the mold behind the silicone...which will turn black and make you mad at the sealer...when in fact its growing behind the sealer...not in it. Wash the area good with a bleach or mildew killer...dry it completely...and even use a fan in that area to make sure it dries good. Once it is completely dry...then seal it. You'll be a lot happier that you spent that extra time in prepping it before you sealed it. |
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How many grams of silicon must In the direct reaction of
silicon with Cl2 the yield of
SiCl4 is 50%. How many grans
of the silicon must be reacted
with excess chlorine in order
to obtain 17g of SiCl4.
I have the answer, but I don't
know how it was obtained.
Please explain.
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Atomic mass Si = 28 Atomic mass Cl = 35.5 SiCl4 = 170 (approximately) To get 170 g SiCl4, you need 28 g Si at 100% yield To get 17g SiCl4, you need 2.8 g Si at 100% yield To get 17g SiCl4, you need 5.6 g Si at 50% yield |
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