P2O5->x->K3PO4->FePO4
SI-SIO2->NaSIO3->H2SIO3->SIO2
CuO->CuCl2->Cu(OH)2->CuSO4->Cu
FeCO3->FeO->FeCl2->FeS->FeSO4
P2O5->H3PO4->Na3PO4->Ca3(PO4)2->H3PO4
P2O5->x->K3PO4->Ca3(PO4)2
H2S->S->x->Na2SO3
CaO->x+Na2CO3->CaCO3->CO2
MgSO4->x_t_>MgO->Mg(NO3)2
CuCl2->x_t_>CuO->CuSO4

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Please note that the reactions provided are chemical equations showing the transformation of compounds into other compounds. The arrows indicate the direction of the reaction.

P2O5 -> x -> K3PO4 -> FePO4 (Phosphorus Pentoxide -> Intermediate x -> Potassium Phosphate -> Iron(II) Phosphate)Si-SiO2 -> NaSiO3 -> H2SiO3 -> SiO2 (Silicon - Silicon Dioxide -> Sodium Metasilicate -> Metasilicic Acid -> Silicon Dioxide)CuO -> CuCl2 -> Cu(OH)2 -> CuSO4 -> Cu (Copper(II) Oxide -> Copper(II) Chloride -> Copper(II) Hydroxide -> Copper(II) Sulfate -> Copper)FeCO3 -> FeO -> FeCl2 -> FeS -> FeSO4 (Iron(II) Carbonate -> Iron(II) Oxide -> Iron(II) Chloride -> Iron(II) Sulfide -> Iron(II) Sulfate)P2O5 -> H3PO4 -> Na3PO4 -> Ca3(PO4)2 -> H3PO4 (Phosphorus Pentoxide -> Phosphoric Acid -> Sodium Phosphate -> Calcium Phosphate -> Phosphoric Acid)P2O5 -> x -> K3PO4 -> Ca3(PO4)2 (Phosphorus Pentoxide -> Intermediate x -> Potassium Phosphate -> Calcium Phosphate)H2S -> S -> x -> Na2SO3 (Hydrogen Sulfide -> Sulfur -> Intermediate x -> Sodium Sulfite)CaO -> x + Na2CO3 -> CaCO3 -> CO2 (Calcium Oxide -> Intermediate x + Sodium Carbonate -> Calcium Carbonate -> Carbon Dioxide)MgSO4 -> x -> MgO -> Mg(NO3)2 (Magnesium Sulfate -> Intermediate x -> Magnesium Oxide -> Magnesium Nitrate)CuCl2 -> x -> CuO -> CuSO4 (Copper(II) Chloride -> Intermediate x -> Copper(II) Oxide -> Copper(II) Sulfate)