CHEM CONNECT CH.9

The "big six" polymers are all classified as thermoplastics because they

can be melted and shaped.

Consider this table. Year U.S. population(millions) Plastics produced in the U.S. (billions of pounds) 1997 26989 2003 290107 How many pounds of plastics were produced per person in 2003?

369

Which functional groups are present in all amino acids?

Amine and acid groups

Which would be classified as a natural polymer?

Cellulose

Which raw material serves as the source for most polymers?

Crude oil

Polystyrene is used to make Styrofoam® cups. For this usage, which property is most important?

Good insulator

This is a schematic representation of the two different forms of polyethylene. Which of the following statements is true?

I is HDPE and it has a higher melting point than II which is LDPE

Every year about 100 billion pounds of plastic are produced in the United States (over 350 pounds for every woman, man, and child). What strategies may be employed to reduce the amount of plastics going into landfills?

Incineration Biodegradation Recycling All of these choices are correct

This is a representation of a plastic bag being stretched. Which statement best describes what is happening in the figure?

Molecular chains shift from a random orientation to align parallel to each other in the direction of the pulling force

Will synthetic polymers always have to be made from crude oil?

No, new technologies are being developed to use bio-based raw materials

Which of these synthetic polymers is most closely related to the natural protein polymers?

Nylon

Which would be classified as a synthetic polymer?

Nylon

How are HDPE and LDPE different?

One has branched chains while one is linear

Incineration of plastics can be used to generate energy. One of the "big six" plastics releases hydrochloric acid, HCl, when incinerated. Which one?

PVC

This pie chart gives the composition by weight of municipal solid waste (MSW) before recycling in 2008. Which of the following statements is not true?

The plastic and paper waste combined account for more than half the MSW

What is biodegradation?

Using bacteria and fungi to eat the waste plastic

A polymer is a large molecule

made up of long chains of atoms covalently bonded together.

Polyvinyl chloride (PVC) is used in

plumbing pipe.

Skin, hair, muscle, and enzymes are all made of protein, which is a natural polymer. Proteins are

polyamides.