$Đáp$ $án$ $+$ $Giải$ $thích$ $các$ $bước$ $giải$ $:$

$CaCl_2$ ${\text{ }}\xrightarrow{{{(1)}}}$ $Ca$ ${\text{ }}\xrightarrow{{{(2)}}}$ $CaO$ ${\text{ }}\xrightarrow{{{(3)}}}$ $Ca(OH)_2$ ${\text{ }}\xrightarrow{{{(4)}}}$ $Ca(NO_3)_2$ ${\text{ }}\xrightarrow{{{(5)}}}$ $CaCO_3$

$(1)$ $CaCl_2$ ${\text{ }}\xrightarrow{{{đpnc}}}$ $Ca$ $+$ $Cl_2$

$(2)$ $2Ca$ $+$ $O_2$ ${\text{ }}\xrightarrow{{{t^o}}}$ $2CaO$ 

$(3)$ $CaO$ $+$ $H_2 O$ $→$ $Ca(OH)_2$ 

$(4)$ $Ca(OH)_2$ $+$ $2HNO_3$ $→$ $Ca(NO_3)_2$ $+$ $H_2 O$

$(5)$ $Ca(NO_3)_2$ $+$ $Na_2 CO_3$ $→$ $CaCO_3$ $+$ $2NaNO_3$

$Chúc$ $bn$ $hk$ $tốt$ $!!$ $:))))$

$Xin$ $ctlhn$ $ạ.$

1) `CaCl_2\overset(\text(Điện phân nóng chảy))toCa+Cl_2`

2) `2Ca+O_2\overset(t^0)to2CaO`

3) `CaO+H_2O->Ca(OH)_2`

4) `Ca(OH)_2+2HNO_3->Ca(NO_3)_2+2H_2O`

5) `Ca(NO_3)_2+Na_2CO_3->CaCO_3+2NaNO_3`