How do you set up a decomposition reaction?  The chemicals given are: magnesium ribbon zinc metal 1 M hydrochloric acid aqueous sodium carbonate aqueous potassium hosphate methane carbon dioxide aqueous calcium chloride aqueous sodium sulfate I need to form a decomposition reaction from these chemicals (don't have to use all of them). 

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A decomposition reaction is where a chemical species breaks down, either spontaneously or via a catalyst, into two or more smaller chemicals.  You only need two of the chemicals in the list above to produce a decomposition reaction, 1 M hydrochloric acid and aqueous sodium carbonate.  In a water solution, sodium carbonate (Na2CO3) dissolves and separates into its parent ions sodium (Na+) and carbonate (CO3--).  The carbonate anion will combine with hydrochloric acid (HCl) to make carbonic acid (H2CO3).  Carbonic acid spontaneously decomposes into water and carbon dioxide.  This is shown in the equation below:

H2CO3 --> H2O + CO2

The carbon dioxide produced will bubble out of the solution.

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