Question

What are decomposition reactions?

Answer 1

`"Compound "->" Products"`

Explanation:

Decomposition reaction is under this form:

`"Compound "->" Products"`

Which means is that you have one reactant which is a compound that will give you products which could be a combination of:

`"Compound "->" Compound" + "Compound"`

`"Compound "->" Compound" + "element"`

`"Compound "->" element" + "element"`

Example:
When you heat `CuCO_3` it will decompose into copper(II) oxide `CuO` and carbon dioxide `CO_2`:

`CuCO_3(s) -> CuO(s) + CO_2(g)`

Here is a video that explain all types of chemical reactions alone with an experimental example on each.