1. Solutions, Suspensions and Colloids
Activity 2-4
Key Concepts: mixtures vs. pure substances, types of mixtures

2. Materials Needed Large test tubes with stoppers (6/group)
Beral pipettes (1/group)
Weigh boats (3/group)
Laser pen (1/group)
Ringstand (1/group)
Filter paper (5/group)
3” funnel, short stem (1/group)
50-mL beaker (1/group)
Milk (1/2 pint/class)
Olive oil (25 mL/class)
Balance, 0.01g (1-2/class)
Soil (1 cup/class)
5 g CuSO4
5 g NaCl
Types of matter concept map (4 class sets)

3. Do Now – August 25/26
Chemistry is defined by two different types of materials – ‘mixtures’ and ‘pure substances’. What do you think some of the differences between mixtures and pure substances might be?

4. Objective
I can explain the differences between types of mixtures, graphically and in writing, using a macro-nano-symbolic table.

5. Homework – Due Thursday/Friday
Make a graphic organizer showing the following terms:
Mixture
Pure substance
Element
Compound
Heterogeneous mixture
Homogeneous mixture
Solution
Suspension
colloid

6. Agenda Do Now, Objective (5 min) Mixtures vs. Pure Substances
Solutions, Suspensions and Colloids Lab
Chem Talk Reading
BrainPop Video
Solutions, Suspensions and Colloids Lab 2
Chem to Go: Individual Practice
Exit Ticket

7. Mixtures vs. Pure Substances
Draw this diagram (including particle diagrams) in your notes.
All matter has mass and takes up space
Pure substances are made up of one type of matter – they are elements and compounds, and cannot be broken down physically
Mixtures are made up of more than one type of matter – they are homogeneous or heterogeneous. They can be taken apart physically.

8. Solutions, Suspensions and Colloids
One way to get different types of materials is to mix them together. Lots of different things can happen when materials are mixed. Each mixture has its own properties (characteristics)
Taking mixtures apart is much harder!

9. Think Pair Share
Is it easier to separate milk from coffee or milk from a bowl of cereal? Why?

10. Solutions, Suspensions and Colloids
In today’s lab, you will be examining the properties (characteristics) of 5 different mixtures. You will use your observations to learn about the three different types of ‘mixtures’ that exist in the world:
Solutions
Suspensions
Colloids

11. Lab Groups Noah, Wendy, Irma, Adrian Charlie, Daira, Edgar T., Cecilia
Tierra, Christopher, Kassandra, Marjon
Silvia, Andy, Nataly, Edgar M
Samantha, Coral, Jesus, Edgar S.
Alejandro, Gabriela, Sarah, Christian
Brayan, Maria, Leidy, Whitney
Alondra, Elva, Ulises, Eriberto

12. Lab Groups Kaley, Juan, Jean, De’Oshana Tajane, Oscar, Ever, Cookies
Saisha, Ricardo, David
Jose B., Alejandro, Gabriel, Keioshana
Yaridt, Danny, Liliana, Kaley
Daniel G., Gerald, Luz, Denys
Rolando, Antonia, Corina, Cristobal

13. Lab Groups Kaley, Juan, Jean, De’Oshana Tajan’e, Oscar, Ever, Cookies
Saisha, Ricardo, David, Carlos Castillo
Jose B., Alejandro, Gabriel, Carlos Cisneros
Yaridt, Danny, Liliana, Jose R.
Daniel G., Luz, Denys, Keioshana
Rolando, Antonia, Corina, Cristobal

14. Lab Groups Josse A., Dulce, Justice, Pedro
Aaron, Efren, Lesly F., Sarita
Leslie A., Adrian, Jackie, Milagro
Jazmin H., Bruno, Bryan
Tatyana, Emilia, Juan I., Jorge B.
Joryn, Saul, Jessica L., Danya
Julian, Yizel, Jose R.
Jose V., Natrurell, Natalie G.

15. Lab Groups Alejandra, Alanis, Juan, Miguel
Imani, Eliot, Isaac, Alondra G.
Gnalen, Darrion, Lizbeth, Lesly
Jennifer E., Anifa, Jennifer A., Esperanza
Alondra A., Brenda, Vilma, Sandy

16. Form Groups Go to your group’s station Assign group roles
Send the Time/Materials Manager to get a lab worksheet

17. Step 1 – Get Materials
Complete STEP 1 – Get Materials with your group.

18. Step 2 – Setup Lab Station
Complete STEP 2 – Setup Lab Station with your group
PUT ALL MATERIALS IN DIFFERENT TEST TUBES
Make sure that all test tubes are labeled
Spokesperson: take notes on your data table

19. Step 3 – Mix the Mixtures Complete STEP 3 – Mix the Mixtures
Make sure that you write down observations as you mix the mixtures

20. Step 4 – Run Tests on Mixtures
Complete STEP 4 – Run Tests on Mixtures
Use the laser pointer carefully
If you do not know how to fold the filter paper into a funnel, ask Ms. Bergman

21. Step 5 – Clean Up Materials
Complete STEP 5 – Clean Up Materials.
Make sure to return all the materials to the front of the room
Return to your assigned seat.

22. Chem Talk Complete the Chem Talk reading on page 122 of your textbook.
Define the following terms in your vocabulary section
Pure substance
Solution
Solute
Solvent
Colloid
Suspension

23. BrainPop
ndchemistry/compoundsandmixtures/

24. Types of Mixtures
When different substances are mixed together, and can be taken apart physically they are called Mixtures.
Solution: a homogeneous mixture of two or more substances. Homogeneous means that the mixture looks the same throughout.
Suspension: a heterogeneous mixture that contains fine solid particles in a liquid. The solid particles will settle to the bottom.

25. Solutions Solutions have two parts – solute and solvent
Solute: what is dissolved
Solvent: what the solute is dissolved in

26. Solutions
Not all materials will form solutions. Sometimes, the solute doesn’t dissolve in the solvent. When this happens, the materials are said to be IMMISCIBLE (not mixable). If the solute dissolves completely, then the materials are MISCIBLE (mixable)
The oil is immiscible in the water.

27. Suspensions
Suspensions have the largest particles. These particles will float at first, but eventually settle out from the material they’re floating in.

28. Solutions vs. Suspensions
Solutions look the same throughout = homogeneous
Suspensions look different throught = heterogeneous

29. Colloids
Colloids are between solutions and suspensions. The particles are bigger than those in solutions, but they don’t settle to the bottom like in suspensions.
Milk is a colloid because liquid globs of fat are spread throughout water

30. LAB – Step 6 Go back to your lab groups
Use your understanding of mixtures to complete STEP 6 – Analysis with your group

31. Chem Essential Question
Macro
Nano
Symbolic
The solutions look the same throughout. You cannot see differences in them. The laser goes straight through
The suspensions look the same at first, but eventually the particles settle out. The laser doesn’t go through.
The colloids look like one material, but the laser does not go straight through
The solute particles are so small that they cannot be seen
The particles in the suspensions are large enough that they can be seen, and eventually settle out
The particles in the colloid are too small to see, but large enough that they disrupt the laser pointer

32. Finish Lab Turn your lab into the proper bin
Return to your assigned seat.

33. Exit Ticket Which of the following is a colloid? Explain.
NaCl dissolved in water
Milk
Sand mixed with water
Raisin bread
If a solute dissolves completely in a solvent in all proportions, that substance is said to be:
Immiscible
Heterogeneous
Miscible
A suspension

34. Mixtures Day 2

35. Do Now
Explain the difference between suspensions, solutions and colloids in 2-3 complete sentences.

36. Do Now
Explain the difference between suspensions, solutions and colloids in 2-3 complete sentences.
Solutions, suspensions and colloids are different types of mixtures. They are made up of more than one substance and are not chemically combined. Solutions are homogeneous (look the same), but suspensions and colloids are heterogeneous (look different). Suspensions have large particles that can be seen, and colloids have medium-sized particles that can be seen with a microscope.

37. Objective

38. Agenda Do Now, Objective (5 min) Review Mixtures (15 min)
Mass and Volume Lab (20 min)
Mass and Volume Analysis (20 min)
Significant Figures Mini-Lesson (10 min)
Weekly Quiz (15 min)

39. Guided Notes
Classify each of the following as a suspension, colloid, or solution. Explain your reasoning. (Hint: in some cases more than one answer may be possible).
A mixture is poured through a filter and the entire mixture passes through
A mixture is left to stand for a while and small particles settle out
When viewed under a microscope, small particles are visible in the mixture
A beam of light passed through the mixture is scattered.
The mixture is blue and transparent (see-through)

40. Guided Notes
Classify each of the following as a suspension, colloid, or solution. Explain your reasoning. (Hint: in some cases more than one answer may be possible).
A mixture is poured through a filter and the entire mixture passes through – Solution. The particles are small, and pass through the filter.
A mixture is left to stand for a while and small particles settle out – Suspension. You can see the particles settle out.
When viewed under a microscope, small particles are visible in the mixture – Colloid. The particles are slightly larger, and can be seen with a microscope.
A beam of light passed through the mixture is scattered. – Colloid – the mixture scatters light.
The mixture is blue and transparent (see-through) – Solution, the particles are extremely small.

41. Guided Notes
Suggest a method you could use to separate the different materials in each of the following mixtures
Solutions
Colloids
Suspensions

42. Guided Notes
Suggest a method you could use to separate the different materials in each of the following mixtures
Solutions – Evaporation. Think about what happens to your gym clothes after you sweat in them.

43. Guided Notes
Suggest a method you could use to separate the different materials in each of the following mixtures
Colloids – Evaporation
Clarified butter – heat it up and the water evaporates. Then the fat and the milk separate by density in the pan.

44. Guided Notes
Suggest a method you could use to separate the different materials in each of the following mixtures
Suspensions – filtration. You can see the bigger particles get caught in the filter while the smaller particles go through.

45. Types of Substances Graphic Organizer
Draw this graphic organizer in your notes

46. Significant Figures
9xeTFA

47. Rules for Significant Figures
Non-Zero = ALWAYS COUNT
28.1 contains three significant figures
11,387 contains five significant figures
Captive 0’s = ALWAYS COUNT
1004 contains four significant figures
contains six significant figures
Leading 0’s = NEVER COUNT
Zeros to the left of the first non-zero digit are not significant; they indicate the position of the decimal point
contains two significant figures
contains four significant figures
Trailing 0’s = SOMETIMES COUNT
Zeros to the right of the decimal point are significant if they are at the end of the number (or if they are followed by non-zero digits). 
contains three significant figures
820.0 contains four significant figures
contains seven significant figures

48. Weekly Quiz 15 minutes Solutions, suspensions, colloids
Mass, volume and density
Good luck! Do your best!