Decomposition reaction (1 Viewer)

[jjuunnee]

I know that in the decomposition reaction AB --> A+B but I don't understand the examples listed below

First one:
CaCO₃ ---> CaO + CO₂
why does it equal to calcium oxide + carbon dioxide and not calcium + carbonate?

Second one:
KClO₃ ---> KCl + O₂
I just don't understand this one haha

 

[leehuan]

I know that in the decomposition reaction AB --> A+B but I don't understand the examples listed below

First one:
CaCO₃ ---> CaO + CO₂
why does it equal to calcium oxide + carbon dioxide and not calcium + carbonate?

Second one:
KClO₃ ---> KCl + O₂
I just don't understand this one haha

Assuming you meant calcium ions (and carbonate ions) for the first one.

Some reasons I can get off the top of my head
a) What's the point. Their ionic bond will probably reform in a matter of seconds
b) CaO and CO₂ are also stable substances that can occur naturally.

 

[dan964]

I know that in the decomposition reaction AB --> A+B but I don't understand the examples listed below

First one:
CaCO₃ ---> CaO + CO₂
why does it equal to calcium oxide + carbon dioxide and not calcium + carbonate?

Second one:
KClO₃ ---> KCl + O₂
I just don't understand this one haha

Another example
MgSO₄ -> MgO + SO₃ or
2MgSO₄ -> 2MgO + O₂ + 2SO₂

Pretty much the decomposition tends to form stable substances.

Your second example is not balanced. but if it was the thing to consider, that elements with valency + 1 are likely to easily bond with elements with valency of -1.