A synthesis reaction is a reaction in which two or more substances combine to yield a single product.
A synthesis reaction is a reaction in which two or more substances combine to yield a single product. In considering the reaction; 2Mg+ O2— 2MgO, we can see that a single product was formed as highlighted above.
Hence the reaction as written in the question above can rightly be classified as a synthesis reaction because a single product was formed.
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