The silicate industry
Answers are for parents and teachers.
1
Complete Na₂CO₃ + SiO₂ → ?. How many moles of CO₂ are released from 106 g Na₂CO₃?
Na₂CO₃ + SiO₂ → Na₂SiO₃ + CO₂↑; 1 mol of CO₂.
2
In glass making, 1 mol Na₂CO₃ and 1 mol CaCO₃ are fused with excess SiO₂. How many grams of CO₂ are released in total? (M(CO₂) = 44)
88
3
Why can glass be given many shapes?
It has no sharp melting point; it softens gradually and its viscosity changes slowly.
4
List five silicate objects from home or school and say which type each is (glass, ceramics, cement).
For example: window — glass; brick — ceramics; cup — ceramics; tile — ceramics; concrete slab — cement.
5
Write one sentence about the old tradition of the silicate industry in Uzbekistan.
The potters of Samarkand, Bukhara, Khiva and Rishton have made pottery and patterned tiles for centuries.