What type of reaction is shown below? Check all that apply. Ca + 2H2O → Ca (OH) 2 + H2 synthesis decomposition combustion single replacement double replacement

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Princess

Chemistry

9 November, 23:31

What type of reaction is shown below? Check all that apply. Ca + 2H2O → Ca (OH) 2 + H2 synthesis decomposition combustion single replacement double replacement

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Answers (2)

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Reid Lam · Answer 1

The third option is correct which is single replacement.

Explanation:

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.

Dutchess · Answer 2

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