Câu 8:

`\text{2KMnO}_4` $\xrightarrow{\text{t}^o}$ `\text{MnO}_2 + \text{K}_2\text{MnO}_4 + \text{O}_2↑`

`\text{Fe} + 2\text{HCl}` $\xrightarrow{\text{t}^o}$ `\text{FeCl}_2 + \text{H}_2`

`\text{2Fe} + \text{3Cl}_2` $\xrightarrow{\text{t}^o}$ `\text{2FeCl}_3`

`\text{3Fe} + \text{2O}_2` $\xrightarrow{\text{t}^o}$ `\text{Fe}_3\text{O}_4`

`\text{Fe}_3\text{O}_4 + \text{8HCl}` $\xrightarrow{\text{t}^o}$ `\text{2FeCl}_2 + \text{FeCl}_3 + \text{4H}_2\text{O}`

Câu 9:

`\text{2Na} + \text{2H}_2\text{O} -> \text{2NaOH}` `+` `\text{H}_2`

`\text{CaCO}_3` $\xrightarrow{\text{t}^o}$ `\text{CaO}` `+` `\text{CO}_2`  

`\text{2KClO}_3` $\xrightarrow{\text{t}^o}$ `\text{2KCl}` `+` `\text{3O}_2`

`\text{4P} + \text{5O}_2` $\xrightarrow{\text{t}^o}$ `\text{2P}_2\text{O}_5`

`\text{P}_2\text{O}_5 + \text{3H}_2\text{O} -> \text{2H}_3\text{PO}_4`

2KMnO4 -> MnO2 + K2MnO4+ O2 ↑

Fe +2HCl -> FeCl2 + H2

2Fe+3Cl2->2FeCl3

3Fe+2O2->Fe3O4

Fe3O4+8HCl->2FeCl2+FeCl3+4H2O

câu 9

2Na+2H2O-->2NaOH+H2

CaCO3-to->CaO+CO2

2KClO3-to->2KCl+3O2

4P+5O2-to->2P2O5

P2O5+3H2O-->2H3PO4