Question

An unbalanced chemical equation is shown:

Answer 1

balancing the eqn: 2CaO + 2H2O → 2Ca(OH)2

so two Ca(OH)2 are produced.

two things combine to form a single compound so its synthesis reaction.

ans is Two molecules of Ca(OH)2 should be produced during the synthesis reaction.

Answer 2

There are 2 Ca, 4 H (2*2) and 4 O (2+2) on the left hand side. So there should be the same number of atoms 2Ca and 4(O+H) on the right hand side.  The reaction is a synthesis (making something new), rather than a decomposition (destroying something).

The answer is Two molecules of Ca(OH)2 should be produced during the synthesis reaction.