Lesson 13

  1. Lesson 10
  2. Lesson 11
  3. Lesson 12
  4. Lesson 14
  5. Lesson 15
  6. Lesson 16

: ϳ. . .

Section I

Ex. 1. Practise your pronunciation.

a) period [ 'pionod], ancient [' einjont], civilization [.smlai'zeijn], China [ 'tjaino], India [' indjo], Greece [gri: s], Egypt [ 'iidsipt], quintessence [kwin 'tesns], elixir [l'likso], technique [tck'niikj, iatrochcmist [ai'a: trdo'kemist], pursuit [pd'sju: t], phlogiston [flo'dsiston], subsequent [' sAbsikwont], qualitative [ 'kwohtotiv], quantitative fkwontitotiv], identify [ai'dcntifai], urea [juono]

b) there \ are, inuthe \ history, au'theoryuof \ numbers, could ^ be ^ Nchangcd, 'oneuofv\ Which, andutheu\ Answer, 4hisuisuthe \ datc, \ provcduthat, theudis'coveryuofNparticlcs

c) There are 'five' periods | in the 'history of \ chemistry.

Ex. 2. Pay attention to the structure of the following words, translate them into Russian:

a) collcctive, elusive, native, quantitative, qualitative, imperative

b) afternoon, anything, football, nevertheless, iatrochcmist, meanwhile, three-dimcntional, withstand, quintessence

e) technique, unique

Ex. 3. Define the meanings of the word matter in the following sentences:


1. During the phlogiston period men postulated a hypothetical matter. 2. Biology is the science of the physical life of living matter. 3. What is the matter with you? 4. We have not discussed this matter yet. 5. No matter what method of preparation was used, the substance should be pure. 6. It is a matter of common knowledge that matter can be neither destroyed nor created. 7. It is just the matter of time when the problem will be solved. 8. As a matter of fact the properties were quite different from diosc postulated

Ex. 4. Find the predicate and the subject in the following sentences:

1. The ancient period in the history of chemistry comprising the older civilizations developed practical arts and a philosophical approach to the study of matter. 2. The principal goals of an alchemical period were an elixir of life and the philosopher's stone. 3. By the philosopher's stone alchemists wanted to change base metals into gold. 4. This is the date when modem chemistiy begins. 5. Organic chcmistiy was not understood until 1828.6. Fricdcrich Wohler proved that the vital force was not needed for the production of compounds. 7. The periodic law withstood the onslaught of the discovery of the subatomic particles.




Text 9 | Fluorine | Lesson 10 | Text 10 | Lesson 11 | Fascinating Phosphorus | Modifications of Phosphorus | Lesson 12 | Chemical Symbols for Representing Compounds | Text 13 |

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