C10b.5 Materials

What is the main component of soda-lime glass?

• Calcium carbonate

• Silicon dioxide

• Magnesium oxide

Which material is added to soda-lime glass to make borosilicate glass?

• Sodium oxide

• Lead oxide

• Boron trioxide

What happens to the structure of glass when it cools?

• It forms regular crystal patterns

• It retains a disordered structure

• It becomes metallic in nature

Why is soda-lime glass not used for laboratory equipment?

• It is too expensive

• It is too soft

• It softens at lower temperatures

What makes ceramics brittle?

• Weak metallic bonding

• Ionic charges that resist movement

• Flexible polymer chains

What are clay ceramics mainly made from?

• Polymer chains

• Crystalline metals

• Clay minerals and water

Which process hardens clay ceramics?

• Cooling slowly

• Heating in a furnace

• Freezing under pressure

Why is the structure of a ceramic object rigid?

• The atoms are arranged randomly

• The layers slide past easily

• The ions are fixed in place by strong forces

What is a composite material?

• A pure material used for reinforcement

• A blend of two materials for improved properties

• A substance made entirely of polymers

Which of the following is a composite?

• Glass

• Steel

• Fibreglass