Тема 3. «Химическая лаборатория. Эксперименты в лаборатории. Правила безопасности в лаборатории». Module 4

Task 1. Remember the following words and word combinations:

to escape – выделяться to pour – наливать to complete – завершать to ignite – поджигать weighing bottle – посуда для взвешивания googles – очки to warm – согревать, нагревать to be alike – быть похожим to transform – превращать(ся) to uncharged – разряжать to boil – кипеть to serve – служить retort – реторта to expel – выделять, выталкивать litmus – лакмус

harmful – вредный odour – запах drawer – выдвижной ящик flask – колба beaker – мензурка химический стакан funnel – воронка glassware – стеклянная посуда crucible – тигель vapour – пар fume – запах moist – влажный sour – кислый evaporating dish to pass – проходить flame – пламя light up – освещать

Task 2. Read the words and word combinations. Mind the pronunciation:

iron, chloride, hydrogen chloride, sodium nitrate, hydrochloric acid, nitric acid, suffocating odour, porcelain, moist, sulphuric acid, weighing bottle, sulphate, apparatus, ventilating hood, test-tube

Task 3. Transform into the Past. Mind the modal verbs:

1. He can use analytical balance as he has to work with very minute quantities. 2. He is to be at the laboratory at 7 o'clock. 3. She has to make an experiment today. 4. You must be very attentive, working at the laboratory.

Task 4. Fill in the blanks with can, may, must, to be to, to have to. Mind the tense.

1. I … help you yesterday as I came very late from the institute.

2. You … understand now that it is necessary to do everything in time.

3. … I take your dictionary? I have lost mine.

4. I can't go with them as I ... at the Institute at half past nine.

5. They ... prepare everything for the experiment tonight.

6. As he made many mistakes in his last work he … to rewrite his work.

7. Yesterday he … came to the library as he had a meeting.

8. At ten a.m. he … to make a report, I think it will be interesting.

9. If you want, you … read this article.

10. As the question is not solved the meeting ... to be put off.

Task 5. Read the text, divide it into logical parts and entitle them. Discuss it in your group. Here you can watch a film about a laboratory and its equipment http://chemistry-chemists.com/Video/Chemical-Lab.html

Laboratory

All the laboratories of inorganic chemistry are almost alike. These are large rooms where both students and research workers carry out their experimental work. Modern laboratories of inorganic as well as of organic and analytical

chemistry are provided with gas and running water. Every laboratory is to be provided with a ventilating hood for escape of both harmful and unpleasant vapours and odours. Every laboratory has to be lit up very well.

There are many laboratory benches with a great number of drawers in every laboratory. Different apparatus, devices as well as materials are to be kept in them. Besides we can see many shelves and cases for containers with chemicals.

On every laboratory bench one can see test-tubes, flasks, beakers, funnels, evaporating dishes, weighing bottles. All this glassware should be kept in good order.

Various burners serve for producing flames. Bunsen burner is to be mentioned among them.

Different crucibles are to be employed when heating of solution and igniting of materials are to be carried out. Crucibles are usually made of quartz, porcelain, and iron. In addition to these crucibles, there are platinum crucibles in some laboratories, but they are used very seldom.

Every laboratory should be equipped with different kinds of apparatus. Everything in the laboratory is to have its definite place.

Task 6. Work in pairs. Render the questions into English and answer them.

1. Что такое лаборатория?

2. Чем оборудованы современные лаборатории органической и неорганической химии?

3. Чем должны обязательно быть оборудованы все лаборатории?

4. Какие приборы необходимы при нагревании и поджигании?

5. Какие лабораторные приборы расставлены на полках?

6. Что обычно стоит на скамейках?

7. Сколько раз в неделю вы работаете в лаборатории?

8. Кто ваш руководитель?

9. Какие опыты вы уже проводили в лабораториях?

10. Какие правила безопасности вы должны соблюдать в лаборатории?

Task 7. Read the text and make a list of safety rules. Discuss it with your group and remember. Do the lab safety quiz after the discussion (http://chemistry.about.com/library/weekly/blsafetyquiz.htm)