Weegy: D. movement of the electrons.
User: Which of the following is NOT always true about a synthesis reaction?
A. One product is formed.
B. There is only one reactant.
C. The general formula is A + B ? C.
D. A reactant might be a compound, or it might be an element.
Weegy: B. There is only one reactant. Because ,In a synthesis reaction, two reactants combine to form a new compound. (More)