1. Unit 1 Mix and Flow of Matter Topic 2 Mixing and Dissolving Remember to name and date your notes!

2. Classification of Matter DON’T WRITE All substances can be broken down into two categories – Pure Substances and Mixtures.

3. A PURE SUBSTANCE contains only one type of particle. A MIXTURE contains two or more types of particles.

4. Homogeneous Mixtures Look as though they have only one substance in them, although, they may have 2 or more.

5. Solutions A solution is a homogeneous mixture in which no settling occurs – the substances always stay together.

6. Solution Sugar water is an example of a solution.

7. Heterogeneous Mixture Mixtures that contain two or more materials that are visible. Also known as Mechanical Mixture Classify the following as: HOMOGENEOUS OR HETEROGENSEOUS

8. Water and Sand Water and Salt Air Coca-Cola Cereal with milk Salt and pepper Kool-Aid Hetero Homo Hetero Homo Hetero

9. In-Between Mixtures Suspension – a heterogeneous mixture in which particles settle slowly after time. (OJ with pulp) Colloid – a heterogeneous mixture in which the particles don’t settle (remember Orbitz?)

10. Dissolving Dissolving – when a solution is formed by mixing two or more materials. Solute – the substance that dissolves in a solution. Solvent – the substance that does the dissolving of a solute. **There is usually more solvent than solute.

11. Dissolving cont’d. What is the solute and solvent in each of the following? 1.Kool-Aid 2.Ocean Water

12. Dissolving cont’d…again! Another way of saying that salt will dissolve in vinegar is to say that salt is “soluble” in vinegar. Soluble means “able to be dissolved in a particular solvent.”

13. How Much Can Be Dissolved? Saturated Solution: one in which no more solute will dissolve. EX. Think of adding sugar to water…eventually, sugar just gathers at the bottom of your glass…no more can be dissolved and is saturated.

14. Unsaturated Solution: one in which more solute could be dissolved.

15. What do you think that “insoluble” means? Solubility refers to how much of a solute we can dissolve in a solvent.