Silica Secrets Unveiled Exploring Properties, Reactions, and Applications

Silica is chemically inert due to strong SIO bonds, requiring high energy for reactions. It reacts with hydrofluoric acid to form silicon tetrafluoride and hydrofluorosilicic acid. Silica is acidic, reacting with bases like sodium hydroxide to form sodium silicate. When heated with carbon, it forms silicon carbide, a very hard substance. Quartz, a form of silica, exhibits the piezoelectric effect, releasing electric charge under pressure, and is used in clocks and broadcasting.

Why does silica generally not react with halogens and other acids?

• It is a base

• It reacts with all acids

• Due to its high bond association energy

• Because it has weak Si-O bonds

What is formed when silica reacts with hydrofluoric acid?

• Silicon carbide

• Sodium silicate

• Silicon tetrafluoride

• Quartz glass

What is the result of heating silicon dioxide with carbon in an electric furnace?

• Hydrofluorosilicic acid

• Quartz glass

• Sodium silicate

• Silicon carbide

What property does quartz exhibit when subjected to mechanical pressure?

• Piezoelectric effect

• Magnetic effect

• Thermal conductivity

• Optical clarity

In which applications is quartz commonly used?

• Clocks and broadcasting

• Building materials

• Making glass

• Chemical reactions