Respuesta :

Hockey20
In a synthesis reaction two or more simple substances combine to form a more complex substance. Two or more reactants yielding one product is another way to identify a synthesis reaction. For example, simple hydrogen gas combined with simple oxygen gas can produce a more complex substance-----water

Answer:

In a synthesis reaction.

Explanation:

n a synthesis reaction or combination reaction two or more elements or compounds combine to form a product, this product is always a compound and more complex one. For example, we can have H₂ + O₂ ------> H₂O, or a molecule of water, which is a compound plus oxygen, which is an element H₂O + O₂ (oxygen)-----> H₂O₂