H2 + Br2 = 2HBr
Ca + 2HBr = CaBr2 + H2
CaBr2 + Na2CO3 = 2NaBr + CaCO3
4K + O2 = 2K2O
K2O + H2O = 2KOH
2KOH + H2SO4 = K2SO4 + 2H2O
K2SO4 + Ba(OH)2 = BaSO4 + 2KOH
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Answers & Comments
H2 + Br2 = 2HBr
Ca + 2HBr = CaBr2 + H2
CaBr2 + Na2CO3 = 2NaBr + CaCO3
4K + O2 = 2K2O
K2O + H2O = 2KOH
2KOH + H2SO4 = K2SO4 + 2H2O
K2SO4 + Ba(OH)2 = BaSO4 + 2KOH