1. Saltwater: This is a simple solution where salt (NaCl) is dissolved in water (H₂O). Separation can be achieved through evaporation.
2. Sand and Iron filings: This is a heterogeneous mixture. A magnet can be used to separate the iron filings from the sand.
3. Oil and Water: This is another heterogeneous mixture. The two liquids don't mix, so they can be separated using a separatory funnel.
