What type of reaction is shown below? Check all that apply. Ca + 2H2O → Ca(OH)2 + H2 synthesis decomposition combustion single r eplacement double replacement
2 answers:
<h2>Answer:</h2>
The third option is correct which is single replacement.
<h3>Explanation:</h3>
Ca + 2H2O → Ca(OH)2 + H2 .
In above reaction Ca take two OH- ions to become Ca(OH)2. So it is replacement of one type of atoms or ions (single replacement). If there is replacement of two type of ions/atoms then it will be double replacement. It is also not combustion or decomposition.
The balanced reaction is
Ca + 2H2O → Ca(OH)2 + H2
Here this reaction can be compared with
A + BC ---> AB + C
So here one reactant (A) is accepting a group which is being given by another compound (BC) however the A is not giving any group / element or ion
So this single displacement
Similarly in the given reaction
the anion OH- is only being replaced
The element Ca accepts OH- and H2O loses the same group to form new element H2
So the correct answer is
Single replacement also known as single displacement
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