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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.

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The proof that in any synthesis reaction, a chemical change has occurred is that in a synthesis reaction, two reactants combine to form a new compound.

Answer: Option (a) is the correct answer.

Explanation:

A chemical reaction is a reaction in which there is formation of new compounds due to change in chemical composition of the reactants during the reaction.

For example, [tex]2Na + Cl_{2} \rightarrow 2NaCl[/tex]

Therefore, we can conclude that a proof that in any synthesis reaction, a chemical change has occurred because in a synthesis reaction, two reactants combine to form a new compound.