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THE SUBJUNCTIVE NOOD AND CONDITIONALSENTENCES 1. Had they taken into account the weight before heating they would have made less mistakes. 2. Thus, the deuterium, the nucleus of H2 could be considered to be built up from a proton and a neutron. 3. Had the condenser been placed in a direct current the current would have started flowing as though the condenser were not present. 4. Were water allowed to run back into the generator an explosion might result. 5. It is necessary that they should determine whether or not this inorganic substance is contained in the sample to be analysed. 6. It is necessary that atomic energy should be used only for peaceful purposes.7. A reliable device for neutron storage could greatly simplify the procedure, so that only one detector would be needed. 8. It is desirable that the determination of the effect of glass composition should be made. 9. If no catalyst were employed in cracking, the process would be called "thermal cracking” 10. If the gas were colourless, we should not notice its formation; we should have noticed the formation of this gas if it hadn't been colourless. 11. If analytical balances were used the results would be much more precise. 12. If air were a single compound the bubbles escaping from the solution would have the same composition as those of undissolved air. 13. If the liquid were placed between the plates of a condenser and an electric field applied, the molecules would tend to orient themselves both —.o positive and negative plates. 14. Had water been purified carefully they wouldn’t. repeat the experiment. Remember; water has to be purified lest it should contain microbes. 15. If two liquids had been mutually insoluble, neither one would have lowered the vapour pressure of the other. 16. It is desirable that the sample should be weighed again as the weight does not confirm our data. 17. If a crucible filled with pure arsenic were heated to a temperature above the melting point of the arsenic, and the system were then allowed to cool, it would be noted that the temperature would increase steadily with time. 18. If pure lead were used the falling drops would solidify rather suddenly on reaching the temperature 327'C. 19. If we contemplated water in a glass, the water would appear optically uniform. At any rate, we cannot discern any difference in the appearance of the water at the bottom of the glass and on the surface.20. If there was no order in the way in which atoms of different elements combine to form the molecules and crystals of compounds, it would be necessary for us to - memorize one by one the formulas of thousands of substances. 21. If an electron were to be removed from the sodium atom, leaving only 10 electrons around the nucleus, the resulting partic1e would have a positive charge, this particle composed of a sodium nucleus and 10 electrons, being called a sodium ion. 22. If the absolute temperature were doubted, the speed of the molecules would increase. 23. If some iodine crystals are put into a flask, which is then stoppered and allowed to stand at room temperature it would soon be seen that the gas in the flask becomes violet in colour, showing that a quantity of iodine evaporated. THE INFINITIVE 1. Reaction appears to be almost instantaneous at room temperature. 2. To test the validity of these assumption, we have to study the reactions of two representative nitrones. 3. However, since the problems to be investigated cannot be solved even in an idealized form by linear differential equation, the differential equation, which we are to use wi.l have to be non-linear. 4. The system under investigation is considered to be in a state of equilibrism, when all the co-ordinates are constant with respect to the time. 5. Hence, the Young's model appears to be too simple and needs to be modified to fit the present experimental findings. 6. He was always the first to take up the most difficult problems and to solve them. 7. One can hardly expect a true scientist to work in the limits of one narrow field. 8. To find the length of an object was a very difficult task and we had to carry out a lot of experiments. 9. Once the distribution of gas velocities has been calculated, the final step is to determine the nature and extent of the separation of uranium isotopes in the gas. 10. The only practical way to detect a slow neutron is to allow it to be absorbed by a nucleus. 11. Since we are to deal very largely with ions in our reactions it is necessary to remember that the solution should be diluted. 12. The science of organic chemistry is a very extensive one, and the selection of a small number of facts to e resented in these two chapters has to be restricted. 13. Urea was ong considered to be the first organic compound, it is known first to be produced in the laboratory. 14. Nylon is known to have been made in several different firms; the first to be produced commercially was the most important. 15. The order of some reactions is known to have been determined by measuring the time required for a constant fraction of reaction to occur. 16. Every living organism can be shown to be made of cells. 17. Since the enzyme concentration in living cells is likely to be difficult to estimate we often speak about their activities. 18. Over the past few years much attention is known to have been given to unimolecular reactions driven by lasers. It has also been stated lasers to find wide application in chemical industry. 19. This assignment is too difficult to be carried out at once, it is to take at least ten days or even more. 20. In qualitative analysis we have to deal with the amphoteric characteristics of the hydroxides. 2l. Since we are to deal very largely with ions in our reactions it is necessary to remember that the solution has to be diluted.to su a degree that the substance is largly ionized. 22. The absorption of a quantum of visible or ultraviolet radiation could be exected to alter the state of excitation electronic structure of an atom or a molecule. (Âîçâðàò) PART II (Íàçàä íà ãëàâíóþ) Date: 2015-12-17; view: 2024
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