1. Mixtures, Concentration, & Solubility

2. What is a Mixture? Two or more different substances combined together What are some examples of mixtures you can think of?

3. The properties of a mixture can vary because the composition of the mixture is not fixed. Can you give an example of a mixture that might vary due to the composition?

4. Types of Mixtures Heterogeneous –a mixture where the parts are noticably different Homogeneous – a mixture where the substances are so evenly distributed that it is difficult to distinguish one substance in the mixture

5. What type of mixture is this? http://www.google.com/imgres?imgurl=http://upload.wikimedia.org/wikipedia/commons/thumb/a/a7/CaesarSalad3.jpg

6. What type of mixture is this? http://www.google.com/imgres?imgurl=http://www.simplyrecipes.com/photos/fresh-tomato-salsa

7. What type of mixture is this? http://www.google.com/

8. What type of mixture is this? www.google.com/

9. What type of mixture is this?

11. What is a solution? The mixture that forms when substances dissolve and form a homogeneous mixture. What are some examples of solution?

12. What is a solute? A substance whose particles are dissolved in a solution What are some examples?

13. What is a solvent? A substance in which a solute dissolves.

14. What do you think it means when I say, “Concentration of a solution.” The concentration of a solution is the amount of solute dissolved in a specific amount of solvent Give me an example of a concentrated solution.

15. Units of concentration Grams of solute 100 cm 3 of solvent Or gms/100cm 3

16. Example: John dissolved 15 grams of iced tea mix in 55 cm 3 of water. What is the concentration of the iced tea? 15 gms X 100 = 27.3 gms/100cm 3 55 cm 3

17. What is solubility? The maximum amount of solute that normally dissolves in a given amount of solvent at a certain temperature. What does this mean?

18. Solubility curve of Salt and Sugar How much sugar can be dissolved at 40˚C?

19. What types of solutions can be made? Unsaturated solution: A solution in which more solute can be dissolved at a given temperature.

20. For sugar, where would the unsaturated solution be for 60˚C?

21. Saturated Solution: A solution that contains as much solute as a solvent can normally hold at a given temperature.

22. For salt: Where would a saturated solution be located at 80˚C?

23. Supersaturated solution: A solution that contains more solute than the solvent can normally hold at a given temperature. Can be made by increasing the temperature and then slowly cooling it down

24. They are unstable solutions Can make a precipitate (a solid that forms and separates from a liquid mixture.) – so some comes back out of solution.

25. Where would supersaturation be located on this graph for sugar?