Technician a says that aluminum should be repaired in a separate area from steel. Technician b says that a vacuum attachment should be used when sanding aluminum. Who is right?.

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).

Answer///precipitate;