Санкт-петербургского государственного университета высшее профессиональное образование т. А. Степанова, И. Ю. Ступина
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| by, of, to, in, after, without, between
1. D. I. Mendeleyev made ... a thorough study ... the relation ... the atomic weights... the elements and their properties. 2. Mendeleyev’s periodic table consisted ... seventeen columns. 3 .... a general way Mendeleyev’s table resembled ... the present periodic table ... the noble gases. 4. Mendeleyev placcd... a number... elements... different positions. 5. The periodic law was accepted ... its proposal... Mendeleyev. 6 . M ost... the elements occur ... the periodic table ... the order ... increasing atomic weights. 7. Mendeleyev predicted the existence ... six elements corresponding... vacant places... his table. 8 . The properties... the newly discovered elements were very close ... the properties predicted ... him. Ex. 9. Translate the sentences into Russian. Pay attention to the meaning of the word that (those). 1. Put your bag on that table. 2. Mendeleyev found that the atomic weights were correlated with the properties of corresponding elements. 3. Ib e atomic weight of potassium is 39.098 and that of argon is 39.948. 4. The inversion of the order in the periodic system from that of atomic weight caused much conccm. 5. The properties o f the elements and those of their compounds arc close to those predicted by Mendeleyev. 6 . That difficulty exists no more. 7. The properties of those compounds arc different. 8 . Elements from Group I differ from those of Group II. Ex. 10. a) Write the three forms of the following verbs: find, have, do, be, mean, know, study, show, bear, lay, draw, found, try, come, take, make, lead, predict, resemble b) Translate the sentences into Russian. 1. Special attention was drawn to valence. 2. The most important step was taken when Mendeleyev studied the relation between the atomic weights and the properties of the elements. 3. This final step was taken by the great Russian chcmist in 1869.4. A periodic table containing seventeen columns was proposed by him. 5. In 1871 the table was revised corresponding to revised values of the atomic weights of some elements. Ex. 7. Give the English equivalents for the following: 21 6 . The periodic law was accepted and widely used by chcmists. 7. It was found that the atomic weights which had been accepted for some elements were not accurate. 8 . After the paper on the periodic table was presented, it was soon published in Russian and in German. 9. Properties of chcmical elements and compounds arc thoroughly studied in laboratories. 10. Some elements were given new places in the table after the revision of their' atomic weights. 11. The inversion o f the order in the periodic system has now been rccognizcd as having little significance. 12. The periodic law is widely applied by chcmists. 13. Radon was discovered during the investigation o f the properties o f radium and radioactive substanccs. Ex. 11. Translate the scntcnccs into English. I. Когда Менделеев разрабатывал периодическую систему, мно гие элементы еще не были открыты. 2. Русское химическое обще ство было основано в 1868 году. 3. Нулевая группа была добавлена к периодическом таблице после открытия инертных газов. 4. Предска зания Менделеева оправдались последующим открытием новых эле ментов. 5. Гелий, неон, аргон, криптон и ксенон были открыты в 1894 году и в последующие годы. 6 . Всю свою жизнь Менделеев по святил развитию науки. 7. Химические свойства указывали на нару шение порядка в нескольких местах в таблице. 8 . Менделеев пред сказал существование шесте элементов. Ex. 12. Make up questions to the italicized parts of the scntcnccs. 1. Mendeleyev proposed a periodic table containing seventeen columns (2). 2. The periodic table was acccptcd immediately after its proposal (2). 3. Most of the elements occur in the periodic table in the order of increasing atomic weight ( 2 ). Ex. 13. Answer the following questions: 1. When did Mendeleyev present his periodic system? 2. Were there noble gases in his periodic table? 3. Why did Mendeleyev revise his table? 4. What elements arc there in Group “0”? 5. How arc elements arranged in the system? 6 . Why arc there elements in the inverted order of atomic weights? 7. What discoveries verified Mendeleyev’s pre dictions? жүктеу/скачать 5,96 Mb. Достарыңызбен бөлісу:
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