The shells of marine organisms contain CaCO3 , largely in the crystalline form known as calcite. There is a second crystalline form of CaCO3 known as aragonite. a. Based on the thermodynamic and physical properties given for these two crystalline forms, would you expect calcite in nature to convert

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)

every chemical equation adheres to the law of conservation of mass, which states that matter cannot be created or destroyed. therefore, there must be the same number of atoms of each element on each side of a chemical equation.