Silicon and its compounds
Answers are for parents and teachers.
1
Complete the hydrolysis SiCl₄ + 2H₂O → ?
SiCl₄ + 2H₂O → SiO₂ + 4HCl
2
Write the reactions of fused SiO₂ with CaO and with Na₂CO₃.
SiO₂ + CaO → CaSiO₃; SiO₂ + Na₂CO₃ → Na₂SiO₃ + CO₂↑.
3
Write equations for the chain Si → SiO₂ → Na₂SiO₃ → H₂SiO₃.
Si + O₂ → SiO₂; SiO₂ + 2NaOH → Na₂SiO₃ + H₂O; Na₂SiO₃ + 2HCl → 2NaCl + H₂SiO₃↓.
4
How many grams of H₂SiO₃ can be made from 244 g Na₂SiO₃ (2 mol)? (M(H₂SiO₃) = 78)
156
5
Why is pure silicon valuable in industry and electronics? Name two uses.
It is a semiconductor, used in electronic circuits (chips) and solar cells.