CBSE Class 11-science Answered
What is silica?
Asked by Topperlearning User | 14 Aug, 2014, 08:56: AM
Expert Answer
- Silicon dioxide, commonly known as silica, occurs in several crystallographic forms.
- 95% of the earth’s crust is made up of silica and silicates.
- Quartz, cristobalite and tridymite are some of the crystalline forms of silica.
- It is a covalent, three-dimensional network solid in which each silicon atom is covalently bonded in a tetrahedral manner to four oxygen atoms.
- Silica in its normal form is almost non-reactive because of very high Si—O bond enthalpy.
Answered by | 14 Aug, 2014, 10:56: AM
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