Solutions, Suspensions and Colloids Activity 2-4 Key Concepts: mixtures vs. pure substances, types of mixtures 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) 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? Objective I can explain the differences between types of mixtures, graphically and in writing, using a macro-nano-symbolic table. Homework – Due Thursday/Friday Make a graphic organizer showing the following terms: ◦ ◦ ◦ ◦ ◦ ◦ ◦ ◦ ◦ Mixture Pure substance Element Compound Heterogeneous mixture Homogeneous mixture Solution Suspension colloid 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 Mixtures vs. Pure Substances Draw this diagram (including particle diagrams) in your notes. 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! Think Pair Share Is it easier to separate milk from coffee or milk from a bowl of cereal? Why? 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 Lab Groups 1. 2. 3. 4. 5. 6. 7. 8. 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 Lab Groups 1. 2. 3. 4. 5. 6. 7. 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 Lab Groups 1. 2. 3. 4. 5. 6. 7. 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 Lab Groups 1. 2. 3. 4. 5. 6. 7. 8. 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. Lab Groups 1. 2. 3. 4. 5. Alejandra, Alanis, Juan, Miguel Imani, Eliot, Isaac, Alondra G. Gnalen, Darrion, Lizbeth, Lesly Jennifer E., Anifa, Jennifer A., Esperanza Alondra A., Brenda,Vilma, Sandy Form Groups Go to your group’s station Assign group roles Send the Time/Materials Manager to get a lab worksheet Step 1 – Get Materials Complete STEP 1 – Get Materials with your group. 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 Step 3 – Mix the Mixtures Complete STEP 3 – Mix the Mixtures ◦ Make sure that you write down observations as you mix the mixtures 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 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. 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 BrainPop http://www.brainpop.com/science/mattera ndchemistry/compoundsandmixtures/ 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. Solutions Solutions have two parts – solute and solvent ◦ Solute: what is dissolved ◦ Solvent: what the solute is dissolved in 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. Suspensions Suspensions have the largest particles. These particles will float at first, but eventually settle out from the material they’re floating in. Solutions vs. Suspensions 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 LAB – Step 6 Go back to your lab groups Use your understanding of mixtures to complete STEP 6 – Analysis with your group Chem Essential Question Macro - 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. Nano - 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 - The colloids look like one see, but large enough that material, but the laser they disrupt the laser does not go straight pointer through Symbolic Finish Lab Turn your lab into the proper bin Return to your assigned seat. Exit Ticket 1. Which of the following is a colloid? Explain. a. b. c. d. 2. 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: a. b. c. d. Immiscible Heterogeneous Miscible A suspension Mixtures Day 2 Do Now Explain the difference between suspensions, solutions and colloids in 2-3 complete sentences. 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. Objective 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) 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. A mixture is poured through a filter and the entire mixture passes through B. A mixture is left to stand for a while and small particles settle out C. When viewed under a microscope, small particles are visible in the mixture D. A beam of light passed through the mixture is scattered. E. The mixture is blue and transparent (see-through) 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. A mixture is poured through a filter and the entire mixture passes through – Solution. The particles are small, and pass through the filter. B. A mixture is left to stand for a while and small particles settle out – Suspension. You can see the particles settle out. C. 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. D. A beam of light passed through the mixture is scattered. – Colloid – the mixture scatters light. E. The mixture is blue and transparent (see-through) – Solution, the particles are extremely small. Guided Notes Suggest a method you could use to separate the different materials in each of the following mixtures ◦ Solutions ◦ Colloids ◦ Suspensions 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. Guided Notes Suggest a method you could use to separate the different materials in each of the following mixtures ◦ Colloids – Evaporation 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. Types of Substances Graphic Organizer Draw this graphic organizer in your notes Significant Figures https://www.youtube.com/watch?v=_jZAe 9xeTFA Rules for Significant Figures Non-Zero = ALWAYS COUNT 1. ◦ 28.1 contains three significant figures ◦ 11,387 contains five significant figures Captive 0’s = ALWAYS COUNT 2. ◦ ◦ 1004 contains four significant figures 5091.08 contains six significant figures Leading 0’s = NEVER COUNT 3. ◦ ◦ ◦ Zeros to the left of the first non-zero digit are not significant; they indicate the position of the decimal point 0.0086 contains two significant figures 0.02088 contains four significant figures Trailing 0’s = SOMETIMES COUNT 4. ◦ ◦ ◦ ◦ 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). 0.0120 contains three significant figures 820.0 contains four significant figures 90.00380 contains seven significant figures Weekly Quiz 15 minutes Solutions, suspensions, colloids Mass, volume and density Good luck! Do your best!