When an iron nail rusts it seems to get heavier in mass. does the iron nail follow the law of conservation of mass?

a. no rusting is an exception to the law of conservation of mass.
b. no since rusting is a chemical change it does not follow the law of conservation of mass.
c. yes, iron chemicals before the reactions, the mass after the reactions is the same.

Which statement correctly describes the phosphate ion, ? it is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge distributed over the entire ion. it is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge on the phosphorus atom. it is composed of one phosphorus atom and four oxygen atoms ionically bonded together, and there is a –3 charge distributed over the entire ion. it is composed of one phosphorus atom and four oxygen atoms ionically bonded together, and there is a –3 charge on the phosphorus atom.