8.2 Composition of Glass and Its Uses

Silicon dioxide is a major component of glass. What is the type of glass formed when 24% of lead(II) oxide is heated with silicon dioxide?

• Fused glass

• Lead crystal glass

• Borosilicate glass

• Soda lime glass

Diagram shows the glasses on spectacles. The glasses contain a layer of substance M. What is substance M?

• Lead(II) oxide

• Silver chloride

• Calcium carbonate

• Boron oxide

Diagram shows a crystal chandelier found in Madam Mariam's living room. What is the most suitable type of glass used to make the chandelier in Diagram and its reason?

• Fused glass: High heat resistance

• Borosilicate glass: High melting point

• Soda lime glass: Low melting point

• Lead crystal glass: High refractive index

A transparent solid is formed when molten sand at high temperature is cooled quickly. What is this solid?

• Ceramic

• Fused glass

• Soda lime glass

• Borosilicate glass

Lead glass is very suitable for making fine glassware and art objects because this type of glass

• has a high refractive index

• has a high softening point

• is most transparent to ultraviolet and infrared rays

• is a good heat insulator

The raw materials for making soda lime glass are

(Select all the correct answers)

• sodium carbonate

• calcium carbonate

• silicon dioxide

• boron oxide

A decorative glassware manufacturer wants to make a display panel that is sensitive to the intensity of light. What is the most suitable material?

• Conducting glass

• Photochromic glass

• Lead glass

• Borosilicate glass

Which of the following properties of lead glass makes it very suitable for making fine glassware and art objects?

• Transparent

• High melting point

• High refractive index

• Good insulator of heat

Which of the following glass has the lowest melting point?

• Fused glass

• Soda-lime glass

• Borosilicate glass

• Lead crystal glass

When a mixture of sand, sodium carbonate and calcium carbonate is heated to a temperature of 1500°c, which type of glass is produced?

• soda-lime glass

• fused silica glass

• borosilicate glass

• photochromic glass