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.

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.