Mixtures and Solutions Investigation 8

1. Mixtures and Solutions Investigation 8 Date: 10/13/14 LT: I can distinguish between mixtures and solutions. Sponge: Name a mixture. Name a solution.

2. To do… Agenda

3. Copy in index Mixture: combination of two or more substances that can be physically separated. Solution: evenly mixed combination of substances that cannot be physically separated.

4. Copy in index Solvent: substance in which a solute is dissolved (the water in lemonade). Solute: substance being dissolved into a solvent (lemon sugar powder in lemonade).

5. Reading/Venn diagram (NB) Mixtures and Solutions reading. While you read… Underline the definitions and draw arrows Complete the Venn Diagram. Only items that share similarities with both are written in the intersection.

8. Reading/Short Answers (NB) Mixtures Reading. We will stop throughout the reading to look at videos and take notes. Read and then answer Q1.

9. Q1 Q: What are some other examples of mixtures? ________________________ _________________________________ _________________________________ _________________________________

10. Q1 Q: What are some other examples of mixtures? Lemonade, trail mix, chocolate chip cookies

11. Underline! Underline the 2nd sentence on page 2 – “A homogenous mixture has the same composition throughout.” Underline the last sentence of 2nd paragraph – “In a heterogeneous mixture the two substances are not evenly distributed.”

12. Underline! Underline each of the first sentences under the descriptions for solutions, colloids, and suspensions. “A solution is a homogenous mixture with tiny particles.” “A colloid is a homogenous mixture with medium sized particles.” “A suspension is a heterogeneous mixture with large particles.”

13. Q2 Q: If you buy a can of paint at a paint store, a store employee may put the can on a shaker machine to mix up the paint in the can. What type of mixture is the paint? Give evidence from this reading to support your answer. _________________________________ _________________________________ _________________________________

14. Q2 Q: If you buy a can of paint at a paint store, a store employee may put the can on a shaker machine to mix up the paint in the can. What type of mixture is the paint? Give evidence from this reading to support your answer. It is a suspension. The paint has sat for a long time and separated out so the employee must mix it back up.

15. Q3 Q: The milk you buy at the supermarket has gone through a process called homogenization. This process breaks up the cream in the milk into smaller particles. As a result, the cream doesn’t separate out of the milk no matter how long it sits on the shelf. Which type of mixture is homogenized milk? Give evidence from this reading to support your answer. _________________________________ _________________________________ _________________________________

16. Q3 Q: The milk you buy at the supermarket has gone through a process called homogenization. This process breaks up the cream in the milk into smaller particles. As a result, the cream doesn’t separate out of the milk no matter how long it sits on the shelf. Which type of mixture is homogenized milk? Give evidence from this reading to support your answer. The milk is a colloid or solution since the particles can’t settle out or be filtered out, and they are too small to see.

17. Review question Review: What are some examples of physical properties? _________________________________ _________________________________ _________________________________

18. Review question Review: What are some examples of physical properties? Color, odor, mass, density, length

19. Q4 Q: Suppose you have a mixture of salt and pepper. What physical properties of the salt and pepper might allow you to separate them? Give evidence from this reading to explain how you would go about separating them. _________________________________ _________________________________ _________________________________

20. Q4 Q: Suppose you have a mixture of salt and pepper. What physical properties of the salt and pepper might allow you to separate them? Give evidence from this reading to explain how you would go about separating them. Their size and boiling points can be used. A special tool like a screen can filter out pepper. The water can be evaporated to leave the salt behind.

21. Q5 Q: Susan makes the following entry in her notebook: “On Friday we were given a blue liquid in a shallow container. We placed it on the windowsill over the weekend. On Monday morning, there was no liquid left, but the dish has some blue stuff in it.” Was the blue liquid in the dish a heterogeneous mixture, a solution, or a pure substance? Explain your choice including evidence from this reading. _________________________________ _________________________________ _________________________________

22. Q5 Q: Susan makes the following entry in her notebook: “On Friday we were given a blue liquid in a shallow container. We placed it on the windowsill over the weekend. On Monday morning, there was no liquid left, but the dish has some blue stuff in it.” Was the blue liquid in the dish a heterogeneous mixture, a solution, or a pure substance? Explain your choice including evidence from this reading. Heterogenous since the mixture separated in to parts just by sitting there.

23. Q5 continued Q. Explain what happened in the dish. _________________________________ _________________________________ _________________________________

24. Q5 continued Q. Explain what happened in the dish. The blue stuff and the liquid separated. The liquid evaporated more quickly leaving the blue stuff.

25. Copy in your notebook under your sponge!

26. Q6 – see next slide Draw a diagram (using particles) to show the difference between: Pure substance vs mixtures 2. Heterogeneous and homogeneous mixtures.

27. Q6 Draw a diagram (using particles) to show the difference between: Pure substance vs mixtures 2. Heterogeneous and homogeneous mixtures.

28. Mixtures and Solutions Date: 10/14/14 LT: I can distinguish between mixtures and solutions. Sponge: Describe the difference between and mixture and solution.

29. To do… Check hw

30. What is a mixture? Can a mixture be all solids? Yes! Like our mystery mixture. Can a mixture be all liquids? Yes! Like salad dressing. Can a mixture be all gases? Yes! Air. Can a mixture be a combination of solid, liquid, or gas? Yes! A mixture is simply a combination of two or more substances.

31. Today we are going to make two different mixtures by combining solids and a liquid. We are using Calcium Carbonate (chalk), Sodium Chloride (salt), and water. Read procedures on pg 131.

32. Materials Mgr: Get a stack of cups. Return them to the table. Collect 2mL of each substance in the correctly labeled cup. Group observations written on page 131. Team Mgr: Collect 30mL of water in each cup. Data Mgrand Info Mgr: Get 2 wooden sticks. Each of you stir one mixture. Group observations written on page 131.

34. Discussion: What happened when you made a mixture of calcium carbonate and water? What happened when you made a mixture of sodium chloride and water? So…one you could still see the solid material, but in the other you couldn’t? Label them mixture and solution!

35. Let’s see how we can “undo” the mixture process - PAGE 133 Show filter cone procedure. Materials Mgr: 2 filter papers 1 funnel stand Team Mgr: Fold filter papers and place one in the funnel. Data Mgr: Place empty C.C. cup under funnel. Slowly pour C.C. mixture into filtered funnel. Observations under filtering results. Info Mgr: Place empty S.C. cup under funnel. Slowly pour S.C. mixture into filtered funnel. Observations under filtering results.

37. PAGE 133 cont. How can we separate the S.C. from the water?

38. Pipette 10 drops of each liquid in the correct well!

39. Clean up! • Return pipettes, wooden sticks, and funnel stands to the side counter. • Trash cups and filter papers. • Return trays near the microwave. • One person at your table takes notebooks back in the crate.

40. Mixtures and Solutions Date: 10/15/14 LT: I can distinguish between solvents and solutes. Sponge: If I want to separate out sand and water, what could I do? If I want to separate out salt from water, what could I do? What might speed up the process?

41. To do… • Check HW

42. Add to your index… Dissolving: when two substances are mixed and it looks like one disappears in the other.

43. How would you…? • How would separate cereal from milk? • How could you speed up the process of evaporation? • If you are trying to dissolve sugar in a cup of tea, how could you speed up the process? (what allows a solute to be more soluble)

44. Page 133: Let’s look at the well trays! What do you see?

45. Take notes on page 132! How did you separate the calcium carbonate and water? Filtration How did you separate the sodium chloride and water? Evaporation Put trays back on counter!

46. Foss Multimedia: Explore Dissolving (show twice) • Concentrate on the solute particles one time and the solvent particles the next time! • http://www.fossweb.com/delegate/ssi-wdf-ucm-webContent/Contribution%20Folders/FOSS/multimedia_ms_1E/ChemicalInteractions/dissolution/dissolution.html

47. Journal check (# card 1-5) For #s 1-4, choose from solvent, solute, mixture, or solution. • ________________is combined completely and with an even distribution and cannot be physically separated. • The substance which is being dissolved into another is called a _________________. Like the sugar • The substance in which another is being dissolved is called the _________________. Like the coffee • A __________ occurs when two or more substances combine together but can be physically separated.

48. Journal check continued For #5, Choose either evaporation or filtration. 5) In our lab, the sodium chloride was separated by the process of _______________.

49. Resource book pg 49/NB pg 135 Read pages 49-53. Answer the questions in full sentences on pg 135.

50. Water particles bump and collide with the copper chloride breaking the bonds. The copper chloride now bonds with the water. • Saliva, sweat, urine, tears, stomach acid, blood • Both – it isn’t clear so it’s a mixture. However, some things are dissolved in it. • Evaporation! The water evaporates leaving the copper chloride.