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V. Прочитайте текст. Дайте полные ответы на вопросы и переведите их.

  A chemical laboratory is equipped with different apparatuses and instruments: microscopes, analytical balances, distillators, burners.

There is a special room for weighing which is equipped with a set of balances for different use. The windows of the weighing-room should overlook the North as the sun may prevent accurate weighing of the substances.

  On the shelves and racks besides empty vessels there are many bottles and boxes with chemical substances called reagents. The most widely used reagents which are available at every laboratory are: acids (nitric, sulphuric, hydrochloric); alkalis (ammonium solution, potassium solution, sodium solution); oxides, inorganic salts, indicators (phenolphthalein, methylene green).

  Reagents which are used in large amounts are supplied in big boxes or bottles. Reagents which are seldom used are supplied in amounts up to 10 or 1g or even less.

  When students come to work to the laboratory they should put on white gowns and wash their hands with running water before work and after it.

1. What is a chemical laboratory equipped with?

2. Why do the windows of the weighing-room should overlook the North?

3. What are the most widely used reagents which are available at every laboratory?

4. What should students put on when they come to work to the laboratory?

2 Вариант

Part I

I. Заполните пропуски притяжательными местоимениями. Переведите.

1. (He) … pictures are beautiful.

2. (They) … tests are made perfectly.

3. (It) … fur is rather long and perfect.

4. (We) … teacher sometimes ring a bell.

5. (I) … brother is cheerful person.

Познавательные статьи:



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История Олимпийских игр

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