How could you tell that something else was produced besides just the rust

It is a mixture. simply put, a compound must be pure, that is, of only one chemical structure and composition. a mixture is made of different chemical substances (i.e. elements, molecules, compounds) that are not chemically bonded to each other, but instead physically grouped together, as in the case of gasoline (a homogeneous solution).

B) movement of materials into and out of the cell

Ch3cooh i think this is the answer