2. Classify the following as: pure substance - element (PE), pure substance - compound (PC), mixtur homogeneous (MHO) or mixture - heterogeneous (MHe) Sodium Milk Blood Saline solution Stainless steel Sugar Salt (NaCl) Brass Chlorine Air -Beryllium (Be) wood Seawater Iron ore wine Greek salad gasoline copper (II) sulfate (CuSO4) plastic lined paper carbon (C) gadolinium (GD) Ammonia (NH3) Iron (III) Oxide (Fe2O3). Iron (Fe)