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Decomposition of a Carbonate

Carbonates are compounds formed between a metal and the carbonate ion, (CO3)2-. When a carbonate decomposes, a metal oxide and carbon dioxide gas are produced. The general pattern of a decomposition of a carbonate reaction is:
MCO
3 --> MO + CO2 (M is used to represent the metal. CO3 is carbonate.)
Look at the example below.
Example #1:
Na
2CO3(s) --> Na2O(s) + CO2(g)
Sodium carbonate decomposes to form sodium oxide and carbon dioxide gas.

Now letâ€™s go step by step.
Predict the products when solid calcium carbonate decomposes.
 Description of Action Action 1. Write the formula for the given reactant. CaCO3(s) --> 2. On the products side of the equation, write the formulas for the metal oxide and carbon dioxide gas separated by a + sign. Be sure to remember to cross charges between the metal and oxygen when writing the formula for the metal oxide. CaCO3(s) --> CaO(s) + CO2(g) 3. Balance the equation CaCO3(s) --> CaO(s) + CO2(g) (It is already balanced.)

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