Question

question 10 (multiple choice worth 3 points)
(06.02r mc)
which is proof that in any synthesis reaction, a chemical change has occurred?
in a synthesis reaction, two reactants combine to form a new compound.
many synthesis reactions involve a phase change.
in a synthesis reaction, oxygen is always converted to carbon dioxide.
all synthesis reactions are exothermic.

Explanation:

A chemical change is characterized by the formation of a new substance. In a synthesis reaction, two or more reactants combine to form a new compound, which is evidence of a chemical change. Phase - changes are physical changes, oxygen is not always converted to carbon dioxide in synthesis reactions, and not all synthesis reactions are exothermic.

Answer:

In a synthesis reaction, two reactants combine to form a new compound.