Question

evelyn mixes vinegar and baking soda in a sealed container. after the reaction, she weighs the container and finds it has the same mass as before. what scientific law does this demonstrate?
mass is created in a chemical reaction
mass is created in a physical change
new chemicals formed from a chemical reaction have a larger overall mass than the original reactants
mass is never created or destroyed

Explanation:

According to the law of conservation of mass, in a chemical reaction (which occurs when vinegar and baking soda react), mass is neither created nor destroyed. Evelyn's experiment, where the mass before and after the reaction in a sealed container is the same, demonstrates this law. The first two options about mass being created in a chemical/physical change are incorrect as mass isn't created. The third option about new chemicals having a larger mass than reactants is wrong because of mass conservation.

Answer:

Mass is never created or destroyed.