Санкт-петербургского государственного университета высшее профессиональное образование т. А. Степанова, И. Ю. Ступина
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1. Crystals melt, forming liquid iodine. 2. The temperature at which the crystals and the liquid arc in equilibrium is callcd the melting point. 3. Freezing of a liquid is very interesting to observe. 4. Healing must be done in the following way. 5. The grouping of molcculcs around a given molecule changes by raising the temperature. 6. What arc you going to do now? 7. Attempts arc being made to synthesize new elements in laboratory. Ex. 9. Translate the sentences into Russian. 1. Who is the discoverer o f the periodic law is well known not only to specialists but practically to everybody. 2. That solid, liquid and gas arc the three main states of a substance is a matter o f common knowledge. 3. Whether these substances will react depends on the conditions o f the reaction. 4. Whether a solution is acidic or not may be easily shown using litmus paper. 5. That a particular substance contains one element or another may be determined by qualitative analysis. 6. That the vapour pressure of a crystal depends on its size is well illustrated by many experiments. 7. Whether water is a compound or not may be shown by the reaction between water and some metals. 8. What ancient scientists thought was based on what they could observe around them. 9. That the alchemical period was very important in the history of chcmistry is unquestionable. 10. That chain molcculcs can be many thousands of atoms in length affects the behaviour of these substances. 11. What number of protons is there in the nucleus of the clement is known from its atomic number. 12. That water will dissolve a great number of different substances is an interesting fact. 13. That at the early stages of its development chemistry was mostly descriptive in character was quite natural. 14. Who the discoverer of nitrogen was is well known, it was isolated by Rutherford. 1 5. That students of chcmistry should be able to write chcmical equations readily and accurately is highly important. 16. That it was A. M. Butlerov who introduced the term “chcmical structure” should not be forgotten. 17. That melting is a physical process must be quite clear to the student of chemistry. 18. Whether the hydrogen bond will be broken depends on the amount of energy. 19. Who will examine us in general chemistry is not known yet. 20. That the aim of scicncc is to explain things is a popular belief. 21. When the process started was not registered by the instrument. 22. What pressure should be applied should be decided before the experiment. Ex. 10. Translate the sentences into English. 1. Как происходит переход из одного физического состояиия в другое, должно быть хорошо понятно каждому студенту. 2. Каждое вещество имеет свою собственную точку плавлення при одинаковом давлении. 3. Точка плавления твердого вещества— это в то же время и точка замерзания жидкости. 4. Известно, что жидкость принимает 126 форму сосуда, в котором она содержится, но сс объем не зависит от объема сосуда. 5. В отличие от газа, у кристаллов и жидкостей моле кулы располагаются довольно близко друг к другу. 6. То что структу ра является одной из важнейших характеристик состояния вещества, необходимо помнить всегда. 7. Кристаллы имеют упорядоченную структуру, а структура жидкости произвольна, поэтому плотность жидкости несколько меньше, чем у соответствующего кристалла. Ex. 11. Answer the following questions: 1. What temperature is callcd the melting point? 2. What is the difference between liquid and crystalline iodine? 3. In what way is it possible to explain the change from the solid to the liquid? 4. What is the principal difference between solid and liquid from the structural viewpoint? 5. What does the molccular motion depend on? жүктеу/скачать 5,96 Mb. Достарыңызбен бөлісу:
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