Методическая разработка по английскому языку для студентов факультета химии и химической технологии " Simple Chemistry" Алматы 2017
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мет. разработка по химии
- Бұл бет үшін навигация:
- Ex. 1 Read and translate the text Bonds
| Present Continuous for future
We use present continuous for future when talk about something which we planned and will do it for certain. In Russian this tense is translated as a future. For example: Tomorrow I am visiting my friend who is at the hospital now. – Завтра я навещу своего друга, который сейчас лежит в больнице. Vocabulary bond связь equal равный near-equal почти равный sharing of electrons равное или почти равное распределите электронов to share распределять, делиться between между bonded atoms связанные атомы to make sense иметь смысл to occur встречаться, происходить difference in разница в electronegativity электроотрицательность to indicate указывать covalent bond ковалентная связь non-polar не полярный polar полярный, дипольный unequal не равный when когда typically обычно a rule правило ionic bond ионная связь complete transfer полный перенос to transfer переносить at all совсем to consist of состоять из generally как правило to create создавать great большой to attract притягивать to take забирать to attract the electrons enough притягивать достаточно электронов to measure измерять ammonia аммиак to observe наблюдать to turn black чернеть impurity примесь pressure давление Ex. 1 Read and translate the text Bonds There are three types of bonds in chemistry. Non-polar covalent bonds occur when there is equal or near-equal sharing of electrons between the two bonded atoms. This makes sense because covalent bonds are the sharing of electrons between two atoms. Molecules such as Cl2, H2 and F2 are good examples. Typically, a difference in electronegativity between 0.0 and 0.4 indicates a non-polar covalent bond. Polar covalent bonds occur when there is unequal sharing of the electrons between the atoms. Molecules such as NH3 and H2O are examples of this. The typical rule is that bonds with an electronegativity difference between 0.5 and 1.7 are polar bonds. Ionic bonds occur when there is complete transfer of the electrons in the bond. This bond does not contain atoms at all, but consists of two ions. Substances such as NaCl and MgCl2 are examples. Generally, the differences in electronegativity which are equal to 1.8 or greater create ionic bonds. The difference in electronegativity is so great that one atom attracts enough electrons to "take" them from the other atom. жүктеу/скачать 422,31 Kb. Достарыңызбен бөлісу:
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