Making Silicon Looking into Compounds and Making Silica

The video tutorial discusses silicon dioxide, focusing on its polymorphic nature, which allows it to exist in both crystalline and amorphous forms. Quartz is highlighted as a crystalline form, while minerals like Jasper and Onyx are amorphous. Keselgar, another amorphous form, is derived from diatoms. The preparation of silicon dioxide through the oxidation of silicon and heating of orthosilicic acid is also explained.

How is silicon dioxide (SiO2) prepared from silicon?

What are the conditions required to obtain pure silica from orthosilicic acid?