3) Both matter and energy
Explanation:
First of all, the law of conservation of energy states that:
"Energy cannot be created or destroyed, but only transformed or transferred"
This means that during a chemical reaction, energy is conserved.
Moreover, in a chemical reaction the law of conservation of mass is also valid, which states that:
"In a chemical reaction, the mass of the reactants is equal to the mass of the products"
Therefore, mass is also conserved in a chemical reaction.
So, the correct answer is
3) Both matter and energy
Note that this is not true in a nuclear reaction, where part of the mass of the particles involved can be converted into energy, and therefore, mass is not conserved.
Learn more about the law of conservation of mass:
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