I. Warming up and Vocabulary Work. I.1 Discuss the following questions.

I.1 Discuss the following questions.

1. Are plastics widely used today as engineering materials? (Give examples)

2. What properties do plastics possess useful for industrial purposes?

3. Can plastics be widely used in machine-building?

 

I.2 Alice and Andrew are talking about plastics in the library. Read their dialogue; say what new things you have learnt about plastics.

Alice:Hi, Andrew, are you busy now?

Andrew: yes, I am. I have to draw up a laboratory report. Can you help me do it properly?

Alice: Well as far as I know, a laboratory report must contain the object of the experiment, the results that were obtained and the conclusions.

Andrew:And what about the procedure and the equipment? Must I include them into the report, too?

Alice: In my view, both of them must be included if you need a detailed report. By the way, Andrew, what did you have to determine during your experiment?

Andrew:We had to compare the properties of different plastics.

Alice:And what results did you get?

Andrew: Well, you know that plastics may be divided into thermoplastics and thermosetting plastics. So we have come to the conclusion that thermoplastics may be heated several times, while thermosetting plastics may be heated only once.

Alice:Oh, this is very interesting. And as far as I understand, this peculiarity of plastics must be taken into account when different engineering products are produced.

Andrew:Certainly. And I will have to prove it in my report.

 

I.3 Give answers to the questions given before the text according to the dialogue.

 

I.4 Learn the words to the topic; translate them into Russian and remember them:

 

Nouns	Adjectives	Verbs
molecule chain chemistry cellulose wax coil rubber polyurethane resin plastic thermosets thermoplastics foam sheet film	identical stretched transparent similar sufficient flexible synthetic	synthesize soften harden decompose subject prevent extrude shape mould

 

I.5 Analyze the formation of the verbs; define the original word as a part of speech.

1. to synthesize 2. to softe 3. to harden 4. to decompose

 

I.6 Find the corresponding pairs.

1. воск	a. resin
2. молекула	b. rubber
3. химическое вещество	c. plastic
4. резина	d. wax
5. смола	e. chemical
6. пластмасса	f. transparent
7. одинаковый	g. cellulose
8. прозрачный	h. subject
9. подвергать	i. film
10. клетчатка	j. molecule
11. плёнка	k. sheet
12. лист	l. identical

 

I.7 Make the following nouns plural if possible.

Molecule, chain, chemistry, cellulose, wax, coil, rubber, polyurethane, resin, plastic, film, sheet, foam.