An unbalanced chemical equation is shown: 2cao + 2h2o → ca(oh)2 which of the following statements explains why the equation is not balanced? four molecules of ca(oh)2 should be produced during the decomposition reaction. two molecules of ca(oh)2 should be produced during the decomposition reaction. four molecules of ca(oh)2 should be produced during the synthesis reaction. two molecules of ca(oh)2 should be produced during the synthesis reaction.

The statement that explains the equation is not balanced is option-D. Two molecules of  should be produced during the synthesis reaction.

The balanced equation is,

Here, 2 molecules of CaO react with 2 molecules of water to synthesize 2 molecules 2 molecules of Calcium hydroxide.

Hence option A, B and C can be eliminated.

Therefore, the statement that explains the equation is not balanced is option-D. Two molecules of  should be produced during the synthesis reaction.

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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.

- lead + phosphoric acid = hydrogen + lead(ii) phosphate