Carry out chains of transformations. a) calcium, calcium oxide, calcium hydroxide, calcium phosphate.

| December 9, 2020 | education

Carry out chains of transformations. a) calcium, calcium oxide, calcium hydroxide, calcium phosphate. b) copper, copper oxide, copper chloride, copper hydroxide, copper oxide, copper. c) phosphorus, phosphorus oxide, orthophosphoric acid, calcium phosphate. d) silicon, silicon oxide, sodium silicate, silicic acid, silicon oxide, silicon.

a) calcium, calcium oxide, calcium hydroxide, calcium phosphate.
Ca-CaO-Ca (OH) 2-Ca3 (PO4) 2
1.2Ca + O2 = 2CaO
2. CaO + H2O = Ca (OH) 2
3.3Ca (OH) 2 + P2O5 = Ca3 (PO4) 2 + 3H2O
b) copper, copper oxide, chloride
copper, copper hydroxide, copper oxide, copper.
Cu-CuO-CuCl2-Cu (OH) 2-CuO-Cu
1.2Cu + O2 = 2CuO
2.CuO + 2HCl = CuCl2 + H2O
3. CuCl2 + 2NaOH = Cu (OH) 2 + 2NaCl
4. Cu (OH) 2 = CuO + H2O
5.2CuO = Cu + O2
c) phosphorus, phosphorus oxide, orthophosphoric acid, calcium phosphate.
P-P2O5-H3PO4-Ca3 (PO4) 3
1.4P + 5O2 = 2P2O5
2.P2O5 + 3H2O = 2H3PO4
3.2H3PO4 + Ca = Ca3 (PO4) 2 + 3H2
d) silicon, silicon oxide, sodium silicate, silicic acid, silicon oxide, silicon.
Si-SiO2-Na2SiO3-H2SiO3-SiO2-Si
1.Si + O2 = SiO2
2.SiO2 + 2NaOH = Na2SiO3 + H2O
3. Na2SiO3 + 2HCl = H2SiO3 + 2NaCl
4.H2SiO3 = H2O + SiO2
5.SiO2 + 2Mg = 2MgO + Si



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