Question

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.

Answer 1

Answer: Option (a) is the correct answer.

Step-by-step 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,
`2Na + Cl_(2) \rightarrow 2NaCl`

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.

Answer 2

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.