- Cooking Oil, Black Pepper, and Pebbles: These substances do not dissolve in water, creating a mixture with two phases (the substance and water). They can be separated using filtration because the particles are large enough to be caught by the filter.- Coffee Powder and Soy Sauce: These substances dissolve in water, resulting in a uniform mixture with only one phase. The dissolved particles are too small to be separated by filtration. Key Concept: Solutions are special types of mixtures where the components are evenly distributed and dissolved, resulting in a single phase and a uniform appearance. They cannot be separated by simple filtration.