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Answer 1

2Ca+O2-->2CaO

CaO+H2O-->Ca(OH)2

Ca(OH)2+H2SO4-->CaSO4+2H2O

Ca(OH)2+2HNO3-->Ca(NO3)2+2H2O

Cu(OH)2+2HNO3-->Cu(NO3)2+2H2O

Cu(NO3)2+H2SO4-->CuSO4+2HNO3

4Na+O2-->2Na2O

Na2O+H2O-->2NaOH

NaOH+H2CO3-->Na2CO3+H2O