Chemistry Polymers IGCSE

What is the main difference between addition polymerisation and condensation polymerisation?

• Addition polymerisation does not produce by-products, while condensation polymerisation does.

• Addition polymerisation results in a lower molecular weight polymer compared to condensation polymerisation

• Addition polymerisation produces more by-products than condensation polymerisation

• Condensation polymerisation does not require a catalyst, while addition polymerisation does

Explain the process of addition polymerisation with an example.

• Addition polymerisation involves the removal of monomers from the polymer chain.

• The polymerisation of ethene to form polypropene is an example of addition polymerisation.

• The polymerisation of ethene to form polyethene is an example of addition polymerisation.

• Addition polymerisation is the process of breaking down polymers into smaller molecules.

What are the properties of polyethene?

• Brittle, easily degradable, high electrical conductivity

• Flexibility, resistance to chemicals, low electrical conductivity

• Stiff, resistant to electricity, low chemical resistance

• Rigid, sensitive to chemicals, high thermal conductivity

Discuss the uses of polyamide.

• Textiles, carpets, and ropes

• Glassware, ceramics, and paper products

• Cooking utensils, electronics, and furniture

• Automobile parts, building materials, and medical devices

How are plastics PE and PP different from each other?

• PE and PP have the same properties and characteristics.

• PE is a type of PP.

• PP is more flexible and has a lower melting point than PE.

• PE is more flexible and has a lower melting point than PP.

What are the environmental concerns related to dealing with plastics?

• Increased air quality, faster decomposition, and benefit to wildlife

• Environmental pollution, harm to wildlife, and slow decomposition

Explain the concept of polymers.

• Polymers are single units with no repeating structure

• Small molecules made up of repeating units called monomers

• Large molecules made up of repeating units called monomers

• Polymers are always in liquid form