Organic Molecules

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  • Topic: Polymer, DNA, Monomer
  • Pages : 5 (1110 words )
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  • Published : May 11, 2013
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ORGANIC MACROMOLECULES

1. What is a polymer?

2. Man-made polymers have been studied since 1832. Today, the polymer industry has grown to be larger than the aluminum, copper and steel industries combined. Polymers already have a range of applications that far exceeds that of any other class of material available to man. Give examples where polymers are applied in each of these categories:

a) Agriculture
b) Medicine
c) Consumer Science
d) Industry
e) Sports

3. Study the following polymer structure:
–CH2-CH2-CH2-CH2- CH2-CH2-CH2-CH2– a) Give the name of this low density polymer.
b) What is the polymer identification code for this substance? c) Write the name and condensed structure of the monomer units of this polymer.
d) Name two properties of this polymer.
e) Name two uses for this type of polymer.

4. a) What is addition polymerisation?
b) Polyethylene is an example of an addition polymer. Describe what happens to the ethene molecule during this process. c) The mechanism of addition polymerisation consists of three steps. Name each step and give a brief description of each.

5. a) What is condensation polymerisation?
b) Where is condensation polymerisation used?

6. Read the following passage and answer the questions that follow:               
Over the past few decades, the use of synthetic polymers in disposable consumer goods has grown tremendously. This growth is proving to be taxing on the waste disposal system, consuming a large fraction of available landfill space. The raw materials for these polymers are obtained from petroleum. To reduce the demand for landfill space and the consumption of limited petroleum reserves, the recycling of polymers has become a subject of concern. One of the problems faced in recycling polymers is the great variety of polymers in use. To help sort wastes by type of polymer, most disposable polymeric goods are labeled with a recycling code: three arrows around a number above the polymer's acronym. These are intended to help consumers separate the waste polymers according to type before disposing of them. Most polymeric materials are recycled only once, and the product made of recycled polymer is discarded after use. To obtain the maximum benefit from recycled polymer, the products made from it generally are intended to have a relatively long useful life. Some recycled PET is now used in 2-liter soft-drink containers. In general, products made from recycled polymers are more expensive than those made from virgin plastic. This is the case because current manufacturing facilities are geared to production from new materials. a) Is petroleum a renewable or a non-renewable resource? b) One of the problems faced in recycling polymers is the great variety of polymers in use. Name four types of polymers and one product they are used for. c) Draw the recycling code for number 5 type polymers such as polypropylene. d) Natural polymers are biodegradable. What does this mean?

7. a) What are the four groups of organic compounds found in living things? Give an example of each.
b) Which group is responsible for the energy requirements of living organisms? c) Which group is responsible for protein synthesis?
d) Which group has amino acids as monomers?
e) Which group has nucleotides as monomers?
f) Which group has monosaccharides as monomers?
g) Which group carries the genetic code of organisms?

8. Describe three difference between RNA and DNA.

SOLUTIONS

1. A polymer is a substance composed of molecules with large molecular mass composed of repeating structural units, or monomer, connected by covalent chemical bonds.

2. a) Agriculture - polymeric...
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