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Both. Glass can formed from silicon dioxide. In this case it's chemical formula will be silicon dioxide. The word glass doesn't refer to a specific chemical, it refers to the material properties of a substance. You can have soda glass, pyrex, crystal glass, and others that aren't even based on silicon. These have different chemical compositions but are all glasses.

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Soda lime silicate glass is amongst the cheapest and common types. That is what is generally described in text books, it would have a formula of [MATH]Na_2SiO_3[/MATH]

Posted

[MATH]SiF_4[/MATH] is the corrosion product itself. Once it has been formed, your glass has already melted away. It does not form a protective layer like aluminium oxide would over aluminium, and will not prevent further corrosion.

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So if an atom has four outer orbit electrons, it can have them all shared with for example four fluorine atoms? This stuff is taught in Finland like in the second year of high school or something. :(

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Thanks. Aren't there also double (or more) electron bonds? Like a carbon atom forming double bonds with two oxygen atoms making carbon dioxide? Or am I way off here? :<

Posted

SiC

Silicon carbide they share 4 electrons each.

One of the hardest substances known to man, hardness close to that of diamonds.

Posted

Its a very interesting compound. One of the few in which the elements belong to the same group of the periodic table (These sort ofcompounds are always interesting -- inter halogen compounds par exemple) . SiC has both structural and physical similarities to diamonds. Its crystal structure is 3-d with both Si and C involved in a complex 3-d matrice, like diamond. It is used extensively in making tools because of its hardness. It has interesting properties also becaues of its part organic nature - which is why it dissolves in organic reagents like carbon tetra chloride.

Posted
Can I made a conclusion of all fluoride compound resist corrosion form HF?

 

Ceratainly not. I would imagine all sorts of reactions take place between the flourides of sulphur and HF. Or for that matter the flourides of xenon.

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