English for chemists

Section III
Ex. 1. Respond to the statements or questions using the following expressions: as far as I know; as far as I remember, to my mind; it's hard to tett; if lam not mistaken; to tett the truth.
Example: I don’t remember when urea was synthesized. • •To tell you the truth, 1 don't remember it cither.
1.1 didn’t know that the alchemical period lasted so long. 2. What did Boyle state in his law? 3. When was Dalton’s atomic theory introduced?

4. What country did Fricdcrich Wohler live in? 5. What period is considered as the beginning of modem chcmistry? 6. What discoveries stimulated the development of chcmistry in the 19th century? 7. Sorry to say, but I’ve never heard about phlogiston before. 8. Do you know how Dalton’s model of the atom looked like? 9. What docs the law of definite proportions state? 10. What is the difference between a compound and a mixture?

Ex. 2. Translate the scntcnccs into English.
1. Если я не ошибаюсь, история развития химии делится на 5 пе­ риодов. 2. Именно поиски флогистона привели к открытию газов, если я не ошибаюсь. 3. Насколько я знаю, философский подход к изучению материи был разработан в Древней Греции. 4. Насколько я помню, чистые вещества впервые были получены алхимиками. S. По-моему, одним из первых газов открыли кислород. 6. Почему люди так долго верили во флогистон?— Трудно сказать. 7. Чем отличается органическая химия от неорганической? — Трудно сказать в двух словах. 8. По правде говоря, мне трудно работать в лаборатории.

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Ex. 3. Макс up short dialogues according to the model.
Model: — A general question.

— An answer (+. -).

Example: — Are you a student?

— Yes, I am. / No, I’m not.

Ex. 4. Give detailed answers to the questions.
1. What do you know about the periodicity in chcmistry? 2. How did chemistry change with time? 3. What were the most important discoveries of the 19th century? 4. What can you say about the 20th-century chcmistry?
Ex. 5. Discuss the following topics:

1. 
   The Achievements of the Ancicnt Civilizations.
   

2. 
   The Principal Discoveries in the History of Chemistry and their Importance.
   
3. 
   The Twenty-First-Century Chemistry.
   
4. 
   New Frontiers in Chemistry.
   

WHAT IS IT?

A substancc which cannot be divided into a simpler one by ordinary chcmical methods.