a)
4FeS+7O₂⇒2Fe₂O₃+4SO₂
4FeS₂+7O₂⇒2Fe₂O₃+4SO₂
Fe₂O₃+6HNO₃⇒Fe(NO₃)₃+3H₂O
Fe(NO₃)₃+3NaOH⇒Fe(OH)₃+3NaNO₃
2Fe(OH)₃⇒Fe₂O₃+3H₂O
2Fe₂O₃⇒4Fe+3O₂
b)
2Zn+O₂⇒2ZnO
ZnS+Na₂O⇒ZnO+Na₂S(2ZnS+3O₂⇒2ZnO+2SO₂)
ZnO+Na₂O⇒Na₂ZnO₂
Zn(OH)₂⇒ZnO+H₂O
ZnO+2HCl⇒ZnCl₂+H₂O
Na₂ZnO₂+4HCl⇒2NaCl+ZnCl₂+2H₂O
ZnCl₂+2NaOH⇒Zn(OH)₂+2NaCl
Zn(OH)₂+CaCl⇒ZnCl₂+Ca(OH)₂
Succes!Sper că te-am ajutat!
