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кристина4тина
кристина4тина
16.01.2021 08:29 •  Химия

Примеры реакций: 1) окислительно-восстановительные 2) соединения 3)разложения по 5 примеров на каждую реакцию

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Ответ:
Milena200516
Milena200516
16.01.2021
1.
3N2 + 3H2 = 2NH3
2Mg + O2 = 2MgO
Cl2 + H2 = 2HCl
3Mg + N2 = Mg3N2
2Na + O2 = Na2O2

2.
4Li + O2 = 2Li2O
H2 + Br2 = 2HBr
CuO + SO2 = CuSO3
2H2 + O2 = 2H20
K2O + CO2 = K2CO3

3.
2H20 = O2 + 2H2
Cu(OH)2 = CuO + H20
H2CO3 = CO2 + H2O
CaCO3 = CaO + CO2
Ca(HCO3)2 = CaCO3 + CO2 + H2O
4,5(7 оценок)
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Ответ:
бэйба123
бэйба123
16.01.2021

CIVII20II7

Объяснение:

определим валентность хлора в его соединении с кислородом — Cl2O7.

 

1. Записываем известную валентность кислорода над формулой. Неизвестную валентность обозначаем буквой x:

 

Clx2OII7.

 

2. Находим сумму единиц валентности каждого элемента. Для этого его валентность умножаем на число атомов:

 

x⋅2=2⋅7.

 

3. Вычисляем x:

 

2x=14,x=14:2=7.

 

Валентность хлора равна VII:

 

ClVII2OII7.

Составление формулы бинарного соединения по валентностям химических элементов

Если известны валентности двух элементов, то можно составить формулу их соединения.

4,6(78 оценок)
Ответ:
s1mple72
s1mple72
16.01.2021

Дур*

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