Polymer Quiz

What is a polymer?

• A type of metal alloy

• A large molecule made of many repeating units called monomers

• A molecule with no repeating units

• A small molecule made of a single unit

What is the main difference between HDPE and LDPE?

• LDPE is harder and more rigid than HDPE

• HDPE has closely packed chains, while LDPE has branched chains

• LDPE has closely packed chains, while HDPE has branched chains

• HDPE is more flexible than LDPE

What effect do plasticisers have on polymers?

• They increase the density of polymers

• They make polymers softer and more flexible

• They make polymers more brittle

• They make polymers more rigid

What are semi-crystalline polymers?

• Polymers with only crystalline sections

• Polymers with only amorphous sections

• Polymers that are completely disordered

• Polymers with both crystalline and amorphous sections

Which of the following is a property of thermosetting polymers?

• They are only used below 125 °C

• They soften when heated

• They can be remoulded after initial forming

• They contain strong crosslinks and do not melt

Which of the following is an example of a thermoplastic polymer?

• Urea formaldehyde

• Bakelite

• Melamine

• Low density poly(ethene) (LDPE)

What is the role of a catalyst in polymerization?

• It has no effect on the reaction

• It is consumed in the reaction

• It initiates the polymerization process

• It slows down the reaction

Which of the following polymers is known for its high impact resistance?

• Polyethylene terephthalate (PET)

• Polycarbonate

• Polystyrene

• Polyvinyl chloride (PVC)

What is the glass transition temperature in polymers?

• The temperature at which a polymer becomes completely crystalline

• The temperature at which a polymer becomes brittle

• The temperature at which a polymer decomposes

• The temperature at which a polymer transitions from a hard, glassy state to a soft, rubbery state