Question

Complete and Ballance the equations

Answer 1

caoh+h2
mgoh2+h2,,,,,,,,,

Answer 2

Answer :

According to the reactivity series these reactions occurs. The reactivity series are also shown below.

The balanced chemical reaction are :

$2Na(s)+2H_2O(aq)\rightarrow 2NaOH(aq)+H_2(g)$

$Ca(s)+2H_2O(aq)\rightarrow Ca(OH)_2(aq)+H_2(g)$

$Mg(s)+2H_2O(aq)\rightarrow Mg(OH)_2(aq)+H_2(g)$

$Zn(s)+2H_2O(aq)\rightarrow Zn(OH)_2(aq)+H_2(g)$

$Fe(s)+2H_2O(aq)\rightarrow Fe(OH)_2(aq)+H_2(g)$

$Zn(s)+2HCl(aq)\rightarrow ZnCl_2(s)+H_2(g)$

$Fe(s)+2HCl(aq)\rightarrow FeCl_2(s)+H_2(g)$

$Zn(s)+2NaOH(aq)\rightarrow Zn(OH)_2(aq)+2Na(s)$

$Al(s)+3KOH(aq)\rightarrow Al(OH)_3(aq)+3K(s)$

$2Al(s)+3H_2SO_4(aq)\rightarrow Al_2(SO_4)_3(aq)+3H_2(g)$