3 Part One. The Predicate

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 tell; i f la m not mistaken; to tett the truth.
Example: I don’t remember when urea was synthesized. - To tell you the truth. I don't remember it either.
1.I 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 chemistry? 6. What discoveries stimulated the development of chemistry 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 does the law of definite proportions state? 10. What is the difference between a compound and a mixture?
Ex. 2. Translate the sentences into English.

1. Agar yanglishmasam, kimyoning rivojlanish tarixi 5 davrga bo'lingan. 2. Aynan flogistonni nazariyasi, agar adashmasam, gazlarni topishga olib keldi. 3. Mening bilishimcha, qadimgi Yunonistonda materiyani o'rganishga falsafiy yondoshilgan. 4. Toza moddalarni birinchi bo'lib alkimyogarlar olishgan. 5. Menimcha, gazlardan birinchi bo’lib kislorodni kashf etgan. 6. Nima uchun odamlar uzoq vaqtdan beri flogistonga ishonishgan? Aytish qiyin. 7. Organik kimyo va noorganiklarning farqi nimada? - Xulosa qilib aytish qiyin. 8. Haqiqatan ham, laboratoriyada ishlash menga qiyin.

Ex. 3. Маke up short dialogues according to the model.

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Ex. 4. Give detailed answers to the questions.

1. What do you know about the periodicity in chemistry? 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 chemistry?

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 substance which cannot be divided into a simpler one by ordinary chemical methods.