Question

СРОЧНО!!! Укажите реакцию замещения: 1) Fe + O2 → Fe3O4 2) Mg + HCl → MgCl2 + H2 3) HgO → Hg + O2 4) FeO + HNO2 → Fe(NO2)2 + H2O . *

Answer 1

4

Формула реакции замещения
RX+ZY=RY+ZX

Answer 2

Reactions and Balanced Chemical Equations

1) Fe + O2 → Fe3O4 - The reaction is a combination reaction where iron reacts with oxygen to form iron(II,III) oxide. - The balanced chemical equation for this reaction is: ``` 3Fe + 2O2 → Fe3O4 ```

2) Mg + HCl → MgCl2 + H2 - This is a single displacement reaction where magnesium reacts with hydrochloric acid to form magnesium chloride and hydrogen gas. - The balanced chemical equation for this reaction is: ``` Mg + 2HCl → MgCl2 + H2 ```

3) HgO → Hg + O2 - This is a decomposition reaction where mercury(II) oxide breaks down into mercury and oxygen. - The balanced chemical equation for this reaction is: ``` 2HgO → 2Hg + O2 ```

4) FeO + HNO2 → Fe(NO2)2 + H2O - This is a double displacement reaction where iron(II) oxide reacts with nitrous acid to form iron(II) nitrite and water. - The balanced chemical equation for this reaction is: ``` FeO + 2HNO2 → Fe(NO2)2 + H2O ```

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