Write word and balanced chemical equation from the reaction; Glass is sometimes decorated by etching pattern on its surface. Etching occurs when hydrofluoric acid reacts with the silicon dioxide in the glass to form gaseous silicon tetra fluoride and liquid water

Answer 1

The word equation for the reaction is:

Hydrofluoric acid + Silicon dioxide → Silicon tetrafluoride + Water

The balanced chemical equation for the reaction is:

\[ \text{4 HF} (aq) + \text{SiO}_2 (s) \rightarrow \text{SiF}_4 (g) + \text{2 H}_2\text{O} (l) \]

In this reaction, 4 moles of hydrofluoric acid react with 1 mole of silicon dioxide to produce 1 mole of silicon tetrafluoride and 2 moles of water.