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Chemical Changes: Evidence and Examples

Explore the concept of chemical changes and solutions. Learn about solutes, solvents, and the different types of solutions. Discover factors that affect solubility and how to interpret solubility curves.

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Chemical Changes: Evidence and Examples

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  1. Warm up 9.3.15 • Give 5 examples (or evidence) of a chemical change • look in your book to help you • Page 24 will be Cornell notes…You probably will need two pages

  2. Solutions What is a solution?

  3. Some Definitions A solution is a _______________mixture of 2 or more substances. Made of two parts: SOLVENTSOLUTES

  4. Parts of a Solution • SOLUTE – the part of a solution that is being dissolved (usually the lesser amount) • SOLVENT – the part of a solution that dissolves the solute (usually the greater amount) • Solute + Solvent = Solution

  5. CHECKPOINT • Mrs. Bradshaw is making lemonade for the class…YUMMMM…wouldn’t it be nice! • What is the solute? • What is the solvent?

  6. Liquid - seawater Gas - air Solid – alloys Liquid/Gas-Soda TYPES OF SOULTIONS

  7. Solubility • Three (3) methods that affect solubility • Mixing, stirring, or shaking • Heating (increase temperature) • Crushing or grinding (increase surface area)

  8. Rate of DissolvingLiquids and Gases • 2L Coke from going flat? • Increase the pressure (keep cap on it) • Decrease the temperature (keep in the fridge) • DON’T SHAKE

  9. Definitions Solutions can be classified as saturated, unsaturated, or supersaturated. A saturated solution contains the maximum quantity of solute that dissolves at that temperature. An unsaturated solution contains less than the maximum amount of solute that can dissolve at a particular temperature Supersaturated solutions: is one that contains more solute than a saturated one at the same temperature

  10. Definitions SUPERSATURATED SOLUTIONS contain more solute than is possible to be dissolved Supersaturated solutions are unstable. The supersaturation is only temporary, and usually accomplished in one of two ways: • Warm the solvent so that it will dissolve more, then cool the solution • Evaporate some of the solvent carefully so that the solute does not solidify and come out of solution.

  11. What is the solubility of Potassium Iodide at 30 degrees Celsius? If 50 g of Sodium Chloride is dissolved in 100g water at 45 degrees Celsius, what type of solution is formed? (saturated, unsaturated, supersaturated

  12. TodayReview Catch up ½ day • MAKE SURE!!! • Vocabulary is complete in Interactive Notebook • Solubility Curve has been turned in (DUE TODAY) • Finish anything from lab yesterday • NOTEBOOK CHECK THURSDAY • Vocabulary (pg 4) • Notes (pg 6) • quick write (pg 7)

  13. Page 22 Solutions Quick Write based on Standards—3 short paragraphs • Summarize solutions • Solute and solvent • IN our sugar lab, the sugar was the ________ and the water was the ________ • Factors affecting Solubility • Relate to Demo. • What were the three ways? • Which one did you observe as the fastest • Solubility Curve • How do you read a solubility curve? • What happens to solubility as the temperature increases? • What is a saturated, supersaturated, and unsaturated solution?

  14. TOD---Quiz • Everyone takes it, • Do you best, • Use your notebook • If you do bad, I will replace with your test grade.

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