When freshly cut sodium metal is exposed to air,the mass of the substance increases.Which of the following is the best explanation for this apparent violation of the Law of Conservation of Mass?
A) The air "pushes down" on the metal, causing the balance to display a falsely high mass
B) The sodium atoms move closer to one another, causing the sample to gain mass
C) The sodium reacts with a component of the air, and the total mass of the reactants is equal to the total mass of the products
D) Thermal energy of the air is converted into the additional mass
E) The Law of Conservation of Mass does not apply to metals
Correct Answer:
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