a) Match English terms and their definitions:
| 1. resin
| a) a thread or filament from which a vegetable tissue, mineral substance, or textile is formed;
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| 2. plastic
| b) a solid or liquid synthetic organic polymer used as the basis of plastics, adhesives, varnishes, or other products;
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| 3. foam
| c) material in the form of a very thin flexible sheet;
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| 4. adhesive
| d) a white translucent material obtained by bleaching and purifying beeswax and used for such purposes as making candles, modeling, and as a basis of polishes;
|
| 5. wax
| e) a colourless pungent gas in solution made by oxidizing methanol;
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| 6. film
| f) a synthetic material made from a wide range of organic polymers such as polyethylene, PVC, nylon, etc.;
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| 7. fiber
| g) a substance with particular chemical properties including neutralizing alkalis, and dissolving some metals;
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| 8. tyre
| h) a lightweight form of rubber or plastic made by solidifying such a liquid;
|
| 9. acid
| i) a rubber ring placed over the rim of a wheel of a road vehicle to provide traction and reduce road shocks;
|
| 10. formaldehyde
| j) a substance used for sticking objects or materials together; glue.
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b) Choose the best variant:
1. The combination of two or more materials is called ….
a) composite material; b) matrix; c) alkali; d) substance.
2. Polymers consist of long-chain molecules made of large numbers of identical small ….
a) chemicals; b) monomers; c) fibers; d) films.
3. Many plastics did evolve as … for natural products such as rubber, ivory or wood.
a) polymers; b) combinations; c) resins; d) replacements.
4. The giant molecules of which polymers consist may be cross-linked, linear or ….
a) sufficient; b) branched; c) similar; d) small.
c) Match the words to get phrases:
| 1. fiber
| a) linked;
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| 2. specific
| b) strength;
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| 3. epoxy
| c) material;
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| 4. cross
| d) resin;
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| 5. polyvinyl
| e) glass;
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| 6. composite
| f) chloride.
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