A: $CaO$
C: $Ca(OH)_2$
D: $Cu(OH)_2$
E: $CuO$
B: $CaCl_2$
F: $NaCl$
G: $NaOH$
PTHH:
$CaCO_3\buildrel{{t^o}}\over\to CaO+CO_2$
$CaO+H_2O\to Ca(OH)_2$
$CuCl_2+Ca(OH)_2\to Cu(OH)_2+CaCl_2$
$Cu(OH)_2\buildrel{{t^o}}\over\to CuO+H_2O$
$CuO+CO\buildrel{{t^o}}\over\to Cu+H_2O$
$CaCO_3+2HCl\to CaCl_2+CO_2+H_2O$
$CaCl_2+Na_2CO_3\to CaCO_3+2NaCl$
$2NaCl+2H_2O\buildrel{{đpmn}}\over\to 2NaOH+H_2+Cl_2$
$4NaOH\buildrel{{đpnc}}\over\to 4Na+2H_2O+O_2$
