A chemist mixes two liquids together, and the reaction produces a gas and a solid. According to the law of conservation of mass, what should the chemist observe when she compares the total masses of the substances before and after the reaction?
A. The masses are equal.
B. The masses are inconsistent.
C. The mass of the substances before the reaction is greater than the mass of the substances after the reaction.
D. The mass of the substances before the reaction is less than the mass of the substances after the reaction.
Answer (3)
A is the answer. Because the masses are equal.
The answer is (A.) The masses are equal. (The law of conservation of mass says that mass cannot be created (added) or destroyed. So the total mass must be the same before and after. Hopefully, this helps)
According to the law of conservation of mass, the total mass of substances before a chemical reaction equals the total mass after the reaction. Therefore, the chemist should observe that the masses are equal. Hence, the correct option is A.
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