What is an example of a synthesis reaction?

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Water decomposing into Hydrogen and Oxygen

Carbon combining with Oxygen to form Carbon Monoxide

Nitrogen and Oxygen combining to form Nitrogen Dioxide

Hydrogen and Oxygen combining to form water

Hydrogen and Oxygen combining to form water, which is an example of a synthesis reaction: 2H2 + O2 → 2H2O
In this reaction, two substances (hydrogen and oxygen) combine to form a new compound (water).