What are plastics?

• Natural materials that can be easily molded into shape.

• Synthetic materials that can be easily molded into shape.

• Organic compounds found in nature.

• Metals that have been used for thousands of years.

What happens to some plastics when they are heated?

• They become hard and rigid.

• They decompose.

• They soften and become flexible.

• They turn into crude oil.

Which of the following is NOT a use for plastics mentioned in the text?

• Milk and fruit-juice containers.

• Rubbish bins.

• Laundry baskets.

• Building construction materials.

What are hard and rigid plastics used to make?

• Spectacle lenses and electrical insulation.

• Toilet seats, electrical switches, and outdoor furniture.

• Milk containers and laundry baskets.

• Crude oil and bitumen.

What are most plastics a product of?

• Physical reactions with natural gas.

• Chemical reactions with crude oil.

• Biological processes with plant materials.

• Mechanical processes with metal ores.

What are plastics made from?

• Single molecules

• Chains of molecules

• Metal alloys

• Natural fibers

What does the term "polymer" mean?

• Poly means 'few'

• Poly means 'one'

• Poly means 'many'

• Poly means 'none'

How many repeated units does the chain of molecules in the diagram have?

• One

• Two

• Three

• Four

What is the Greek word from which 'plastic' is derived?

• Plastikos

• Plastos

• Plastis

• Plastein

What does the Greek word 'plastikos' mean?

• Able to be recycled

• Able to be destroyed

• Able to be moulded

• Able to be solidified