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MCAT Question A Day - 10/21/14 - Answer!

Silica is a network solid of silicon and oxygen atoms. Thempirical formula for silica is SiO2. In silica, to how many oxygen atoms is each silicon bonded?

A.  1
B.  2
C.  3
D.  4

D is correct. Silicon is too large to form pi bonds like carbon does. In order to complete its octet, it must make four bonds. It makes one bond with each of four oxygens. Each oxygen bonds with two silicon atoms.

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