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Химия Answer the questions.
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Match English word combinations with their Ukrainian equivalents.

Translate into Ukrainian the following international words.

EXERCISES

VOCABULARY

GLASS AND GLASS PRODUCTS

Answer the questions.

EXERCISES

1. What are plastics?

2. What are the disadvantages of celluloid?

3. When was bakelite discovered?

4. What plastics can be softened by heat?

5. What are these plastics called?

6. What is the principal agent incorporated in a plastic?

7. Give some examples of fillers.

8. Which is the function of antioxidants?

9. What substances are added to assist the final formation of the product?

10. In what case stabilizers are added to the formation?

11. What does the procedure used to shape a plastic into its final form depend on?

Glass products are enormously varied. They include windows, bottles, mirrors, optical instruments, chemical apparatus, building blocks, pipes, doors, cloth, thermal and electrical insulation, electrical condensers, boats, automobile and aircraft bodies and filters.

Chemically, most glasses are silicates. Silica by itself makes a good glass (fused silica), but its high melting point (1,723° C) (degrees Centigrade) and its high viscosity in the liquid state make it difficult to melt and work. Fused silica products are used only when their special properties (low thermal expansion, light transmission) are essential.

Lime, CaO, is added to the glass, usually in the form of limestone, CaCO3, to form the basic soda-lime-silica glass composition which is used for the bulk of common glass articles, such as bottles and window glass.

pipe- труба thermal - термічний condenser - конденсатор aircraft body – корпус літака by itself – сам собою viscosity – в’язкість liquid state – рідкий стан make it difficult to melt and work – ускладнюють плавлення і обробку thermal expansion – термічне розширення light transmission – передача світла essential - суттєвий lime - вапно limestone soda-lime-silica glass composition – суміш, що складається з соди, вапна і кварцового скла bulk – велика частина чогось article – предмет, виріб

optical, instrument, apparatus, block, automobile, filter, special, composition.

1. electric insulation

2. automobile and aircraft bodies

3. a high melting point

4. high viscosity in liquid state

5. low thermal expansion

6. light transmission

7. the bulk of common glass articles

а. світлопроникність

b. елœектроізоляція

c. більша частина звичайних виробів із скла

d. низьке теплове розширення

e. висока в’язкість в рідкому стані

f. корпуси автомашин і літаків

g. висока точка плавлення

1. Give some examples of glass products

2. What is the melting point of fused silica?

3. In what cases are fused silica products used?

4. For what purpose is lime added to the glass?

5. In what form is lime usually added to the glass?


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