Any element or compound is a PURE SUBSTANCE. 1. Water is a PURE SUBSTANCE because it contains only Water molecules. 2. Blood contains a lot of things so it is a MIXTURE of salt, iron, nutrients, etc. 3. The oceans is obviously a MIXTURE because it has salt and water. 4. Iron is a PURE SUBSTANCE with a chemical element with symbol Fe. 5. Brass is a MIXTURE of copper and zinc. 6. Uranium is a PURE SUBSTANCE with a chemical element with symbol U. 7. Wine is a MIXTURE of water, sugar, alcohol. 8. Leather is a MIXTURE of skin and rubber, etc. 9. Table Salt (NaCl) is a PURE SUBSTANCE because it's a compound. Hope that helps.
