earning tasks 4 Directions: Analyze if the following material are pure substances or mixtures. Classify the pure substances into elements, or compounds, while the mixtures into homogeneous and heterogeneous. Write them in the proper column on the table below. 1. Air 2. Graphite 3. Diamond 4. Distilled water (H2O) 5. Brass 6. Steel 7. Sodium Chloride 8. Copper Wire 9. Milk 10. Gasoline 11. Tap water 12. Oxygen 13. Gold Bar 14. Iron 15. Hydrogen Peroxide (H2O2)​