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Combination reaction, sometimes called synthesis, in composition elements get together to form a compound. eg 2Mg+O2--> 2MgO Decomposition, in decomposition, the compound comes apart.eg CaCO3-->CaO+CO2

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15y ago
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9y ago

In a combination reaction elements combine to form compounds. In decomposition the compound come apart. Decomposition is a reacting substance is slit into simpler products.

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14y ago

you answer my question ediot...

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Q: What is the difference between a combination reaction and a decomposition reaction?
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