Cr <span>1s</span>2 <span>2s</span>2 <span>2p</span>6 <span>3s</span>2 <span>3p</span>6 <span>4s</span>1 <span>3d</span>5
ТИП ХИМ.СВЯЗИ В ВА(ОН)2 -ИОННАЯ СВЯзь
1) Fe + Cl2 = FeCl3
2) FeCl3 + 3NaOH = Fe(OH)3 + 3NaCl
3) Fe(OH)3 + 3HNO3 = Fe(NO3)3 + 3H2O
Ba+ + OH2- + 2h+ + 2cl- = ba+ + cl2- + 2h2o
oh2- + 2h+ = 2h2o
А)
<span>
<span /></span>
<span>2Na + 2H2O -> 2NaOH + H2
2NaOH + H2SO3 -> Na2SO3 + 2H2O
Na2SO3 + CaCl2 -> 2NaCl + CaSO3
2NaCl + CaSO4 -> Na2SO4 + CaCl2
</span>б)
Mg + H2SO4 (разбавл. ) = MgSO4 + H2.
MgSO4 + 2NaOH = Mg(OH)2 (осадок) + Na2SO4.
Mg(OH)2 (нагрев) = MgO + H2O.
MgO + 2HCl = MgCl2 + H2O
в)
2Pb + O2 = 2PbO
PbO + 2HNO3 = Pb(NO3)2 + H2O
Pb(NO3)2 + Ba(OH)2 = Pb(OH)2 + Ba(NO3)2
Pb(OH)2 = PbO + H2O
PbO + SO3 = PbSO4
г)
Cu+2H2SO4 = CuO+SO4+H2O
CuO+ 2HCl = CuCl2+H2O
CuCl2+ 2NaOH = Cu(OH)2+ 2NaCl
Cu(OH)2*CuCO3 t= 2CuO+ H2O + CO2