Ex. 6 Translate from English into Russian or Kazakh.
1. This bond does not contain atoms.
3. All the time I observe the transfer of electrons in ionic bond.
4. This doesn’t make sense at all.
5. These differences in electronegativity create ionic bond.
6. Polar covalent bonds usually occur when there is an unequal sharing of electrons.
7. In covalent bonds I don’t see sharing of electrons.
8. We shared electrons between two atoms.
Ex.7 Read and translate the text.
The preparation of silver nitrate
Hello my name is Andrew. I am working at school. I am working as a teacher of chemistry. Now I will tell you about silver nitrate. I will tell you how to prepare it in the laboratory.
Silver nitrate is present as a complex compound in the solution partially:
2AgNO3 Ag [Ag (NO3)2]
During electrolysis of silver nitrate the release of metal takes place on the cathode partially.
Now I am preparing the solution of silver nitrate c (AgNO3) = 0, 5 - 1 mole /L in the amount of 20-50 mL. I am cooling this solution. I am using a glass cup as an electrolytic cell. Now I see the release of black lustrous crystals of the composition 2Ag3O4 AgNO3. I am removing them from anode. I am washing them with cold water on a glass filter. I will keep this substance for a long time. I will dry them in the air. I will heat a substance at the temperature of 165 – 170 o C. I see now how oxygen is detaching and forming 3Ag2OAgNO3.
Vocabulary
silver nitrate - нитрат серебра
to be present - присутствовать
precipitate - осадок
during - во время
electrolysis - электролиз
laboratory assistant - лаборант
research institute - исследовательский институт
complex compound -сложное соединение
to cool - охлаждать
glass cup - стеклянная чашка
electrolytic cell - электролизер, электролитическая ячейка
lustrous - блестящий
composition - состав
cathode - катод
anode - анод
to remove - удалять
from - с, от
glass filter - стеклянный фильтр
for a long time - в течение долгого времени
to dry - сушить
to heat - нагревать
oxygen – кислород
to detach - отщепляться
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