MgSO3+2NAOh=Ma(OH)2+Na2SO3
C7H16--Cr2O3, t°--> C6H5CH3
C6H5CH3 + Cl2--ультрафиолет--> C6H5CH2Cl + HCl
2C6H5CH2Cl +2Na --> C6H5-CH2-CH2-C6H5 + 2NaCl
2Ca + O2 = 2CaO
CaO + H2O = Ca(OH)2
Ca(OH)2 + 2HCl = CaCl2 + 2H2O
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2Ba + O2 = 2BaO
BaO + H2O = Ba(OH)2
Ba(OH)2 + H2SO4 = BaSO4 + 2H2O