Опишите их цвет и норм. русские названия: MgO; Na*2O; Fe*2O*3; - №27790382

Опишите их цвет и норм. русские названия: MgO; Na*2O; Fe*2O*3;
- Предмет:
  Химия
- Автор:
  brandon163
- 5 лет назад

Ответы 1

MgO - оксид магния, Na*2O - оксид натрия, Fe*2O*3 - оксид железа (3).
- Автор:
  micaelamooney
- 5 лет назад
- 0
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Вариант №1
1. Переведите письменно следующий текст:
The nature of electricity
The ancient Greeks knew that when a piece of amber is rubbed with wool or fur it achieves the power of attracting light objects. Later on the phenomenon was studied, and, the word electric, after the Greek word 'electron", meaning amber was used. Many scientists investigated electric phenomena, and during the nineteenth century many discoveries about the nature of electricity, and of magnetism, which is closely related to electricity, were made. It was found that if a sealing-wax rod is rubbed with a woolen cloth, and, a rod of glass is rubbed with a silken cloth; an electric spark would pass between the sealing-wax rod and the glass rod when they are brought near one another. Moreover, it was found that a force of attraction operates between them. A wax rod repels an electrified sealing wax, however,, and also an electrified glass rod is repelled, by a similar glass rod.
The ideas were developed that there are two kinds of electricity, which were called resinous electricity, and that opposite kinds of electricity attract one another, whereas similar kinds repel one another.
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