1. II III I I. Types of Mixtures (p. 476 – 479) Ch. 15 – Mixtures & Solutions

2. A. Definitions  Mixture = Variable combination of 2 or more pure substances  Homogeneous = uniform composition throughout  Heterogeneous = variable composition HeterogeneousHomogeneous

3. A. Definitions  Solution –  Solution – homogeneous mixture Solvent Solvent – dissolves the solute Solute Solute – substance being dissolved

4. B. Mixtures  Gases can also mix with liquids  Gases are usually dissolved in water  Examples are carbonated drinks Homogeneous mixtures (solutions) Contain sugar, flavorings and carbon dioxide dissolved in water

5. B. Mixtures  Solution homogeneous very small particles – avg diameter usually less than 2 nm (10 -9 m) no Tyndall effect particles don’t settle Ex: rubbing alcohol Tyndall Effect

6. B. Mixtures  Colloid heterogeneous medium-sized particles, usually between 2 nm and 1000 nm Tyndall effect particles don’t settle Ex: milk

7. B. Mixtures  Suspension Heterogeneous large particles usually > 1000nm particles settle Tyndall effect Ex:fresh-squeezed lemonade

8. B. Mixtures  Examples: mayonnaise muddy water fog saltwater Italian salad dressing colloid suspension colloid true solution suspension

9. Mixtures Mini-Lab  Have fun! 20 minutes…