Today…

1. Today… • Get Out: • Nothing • Our Plan: • Airbag Lab (Reading & Initial Measurements) • Homework (Write in Planner): • Nothing

2. Today… • Get Out: • Goggles, Lab Handout, Bag of Supplies • Our Plan: • Airbag Lab • Quick Reminders: • Come up with a design FIRST (use 2.50 g of baking soda and 29.8 mL of vinegar for each trial). • Make sure to time the reaction from beginning to end AND measure the height of your bag for EVERY TRIAL! • After you have a design that you like, tinker with the amounts of vinegar and baking soda until you have the perfect combination. • You MUST have a design by the end of class! • Homework (Write in Planner): • Nothing

3. Today… • Turn in: • Nothing • Our Plan: • Airbag Lab – Packet due TODAY! • Must Have: • Calculations p. 3 & 4 • Trial(s) with Speed & Height/Diagram p. 5 • At least 6 trials changing amount of chemical • Final Tests the last 20 minutes • Homework (Write in Planner): • Enjoy your Weekend

4. Check this out… • Oobleck • http://www.youtube.com/watch?v=1nX8jvj_jOk

5. Today… • Turn in: • YOU NEED YOUR TEXTBOOK TODAY AND NEXT CLASS! • Our Plan: • Video Clips • Stop the Process Reading & Activities • Homework (Write in Planner): • Finish AT LEAST the first two pages from the packet (2 & 3).

6. Here’s some of what you’ll learn… • http://www.youtube.com/watch?v=PBF_t8Zt9AU

7. Page 4, box #1 • http://vimeo.com/2670546

8. Today… • Turn in: • YOU NEED A TEXTBOOK TODAY! • Get out Stop the Process & Clicker • Our Plan: • Clicker Review • Immiscible Love Story • Set Up Borax with your table group • Finish Stop the Process Reading • Quick Review of Saturation • Supersaturated Lab • Wrap Up – Mix-Pair-Share • Homework (Write in Planner): • Finish Stop the Process

9. Quick Review – Grab a Clicker • In salt water what is the solute, salt or water? • In lemonade what is the solvent, water, lemon juice, or sugar? • Which kind of Kool Aid has the MOST SOLVENT; very sweet or barely sweet? • What do we call a solution that can conduct electricity?

10. Solution Formation Animation • http://www.mhhe.com/physsci/chemistry/essentialchemistry/flash/molvie1.swf

11. Immiscible Love Story

12. Steve Spangler Video – Stop the Process Last Box • http://www.stevespanglerscience.com/experiment/instant-hot-ice

13. Saturated vs. Unsaturated

14. Video Clip of Supersaturation – Hot Ice

15. Lab Time!

16. Wrap Up – Mix-Pair-Share • How can you tell if a solution is saturated, unsaturated, or supersatured? • What do you add to a solution to make it supersaturated? • What is an example of two things that are immiscible? • What does it mean if something is deliquescent? • In Jello, what is the solute and what is the solvent?

17. Today… • Turn in: • Stop the Process • Our Plan: • Review • Finish Supersaturated Lab • Molarity POGIL • Wrap Up – High Five • Homework (Write in Planner): • Finish POGIL

18. Review– Mix-Pair-Share • How can you tell if a solution is saturated, unsaturated, or supersatured? • What do you add to a solution to make it supersaturated? • What is an example of two things that are immiscible? • What does it mean if something is deliquescent? • In Jello, what is the solute and what is the solvent?

19. Wrap Up As a team, what are 5 things that you learned today?

20. Saturated vs. Unsaturated

21. Today… • Turn in: • Get Out Index Card/Sticky Note and number 1 - 8 • Our Plan: • Molarity Quick Review • Molarity Quiz • Finish POGIL • Start Crossword Puzzle, if time • Homework (Write in Planner): • POGIL, if not finished

22. Vocab Review • Which word from the word wall am I? • When you add water to Kool-Aid and make it less concentrated. • Two substances that can’t mix, like oil and water. • Milk, cheese, fog, mayonnaise • If you add a seed crystal and a solution crystallizes. • In ocean water, water is the _____. • A substance that cannot conduct electricity.

23. Molarity Review M = mol/L • What is the molarity of a solution with 3.4 grams of HCl in 157 mL? (0.59 M) • What volume of solution would be made from 2.1 moles of 3.72 M solution? (0.56 L)

24. Today… • Turn in: • Get out POGIL • Our Plan: • Finish POGIL • Molarity Activity • Homework (Write in Planner): • POGIL Due next class • State Assessment Next Class

25. Today… • Turn in: • Nothing • Our Plan: • State Assessment • Molarity Review Activity • Molarity Quiz • Homework (Write in Planner): • Nothing

26. Today… • Turn in: • POGIL & Grab a Clicker • Our Plan: • Vocab Crossword Puzzle (25 min) • Dilution Notes • Rainbow in the Blue Lab • Clicker Review • Homework (Write in Planner): • Finish Lab Questions & Crossword

27. Review Time • Clicker Review • What volume of solution would be made if you have 78.9 g of HCl and want to make a 3.72 M solution? • What is the percent by mass of a 25.6 g Kool Aid solution with 3.87 g of Kool Aid powder?

28. Dilution • Definition- making a solution less concentrated • Equation – M1V1=M2V2 • where M= molarity & V=volume

29. Example • What volume of concentrated HCl (12.4M)should be used to make 250mL of 4M HCl?

30. Example • What volume of water should be used ? • Making 250mL

31. Example 2 • 12mL of an unknown concentration of sulfuric acid was used to make a 500mL sample of 0.56M sulfuric acid. What was the concentration of the unknown?

32. Stop! • Complete the example problems in your notebooklet.

33. LAB TIME!!! • Complete the rainbow out of the blue lab

34. Wrap Up • Clicker Review 2 • Clicker Review 3

35. Today… • Turn in: • Crossword Puzzle - basket • Dilution Lab - basket • Our Plan: • Clicker Review • Daily Challenge • Notes • Worksheet #2 • Homework (Write in Planner): • Worksheet Due next class

36. Daily Challenge • In the winter when the streets are going to become icy, what does the city do? Why do they do it?

37. Colligative Properties

38. Molality • Concentration of a solution expressed as moles of solute per kilogram of solvent (m)

39. Equation • m= moles solute mass of solvent (kg)

40. Example • A solution was prepared by dissolving 17.1g of sucrose in 125g of water . Find the molal concentration of this solution. • m= moles solute mass of solvent (kg)

41. Examplecontinued… • Find moles of solute- 17.1 g sucrose x 1mole = 0.0500 mole 342.34 g • Find kg solvent – 125g x 1kg = 0.125kg 1000g • Use equation- 0.0500 mole = 0.400 m 0.125kg

42. Try It Out • Do #1 & #2 on your worksheet

43. Colligative Property • Properties that change when solute particles are added.

44. Vapor Pressure Lowering • Vapor Pressure is the pressure caused by molecules that have escaped from the liquid phase to the gaseous phase. • It is the tendency of molecules to evaporate.

45. Vapor Pressure Lowering • Liquid molecules at the surface of a liquid can escape to the gas phase when they have enough energy. • By adding a solute the amount of surface area for the escaping solvent molecules is less (solute particles take up space). • The solvent molecules have a lower probability to evaporate (pressure is lower)

46. Vapor Pressure Lowering • Example – water vs. salt water

47. Freezing Point Depression • In order for a liquid to freeze it must form crystals. • When a solute is added, it disrupts the solution’s ability to form crystals.

48. Freezing Point Depression • Example – Putting salt on icy sidewalks in the winter

49. Another Example • Antifreeze in cars • Insects & Reptiles– survive freezing temps by producing a form of antifreeze (alcohols and sugars) • Species of fish in the Antarctic

50. Freezing Point Depression • The Equation Δtf = Kfm • Δtf(freezing point depression) is the difference between the freezing points of the pure solvent and a solution • Kf is the molal freezing point constant • m is the molality