1. Water (H₂O): A pure substance made of hydrogen and oxygen atoms in a fixed ratio. It has a consistent composition and boiling point.
2. Gold (Au): A pure element, consisting only of gold atoms. It is a shiny, malleable metal.
3. Table Salt (NaCl): A compound formed by the ionic bond between sodium and chlorine. It has a specific chemical formula and properties.
4. Sugar (C₁₂H₂₂O₁₁): A pure compound made up of carbon, hydrogen, and oxygen atoms in a fixed ratio. It has a distinct sweet taste.
5. Carbon Dioxide (CO₂): A compound composed of carbon and oxygen atoms. It is a colorless gas that is essential for plant life.
1. Seawater: A mixture of water, salt, minerals, and other dissolved substances. The proportions of these components can vary.
2. Air: A mixture of gases, primarily nitrogen, oxygen, and carbon dioxide. The composition of air can change depending on location and altitude.
3. Sand: A mixture of different types of rock particles, often including quartz, feldspar, and mica. The composition and size of the particles can vary.
4. Milk: A mixture of fat, proteins, lactose, and water. The components can be separated by processes like churning (butter) or straining (skim milk).
5. Salad: A mixture of different vegetables, fruits, and dressings. The ingredients can be added in different proportions to create unique combinations.
