Monday September 22, 2014

LT: I can explain the relationship between solubility and temperature. Criteria for Success: *I can experiment with solvents, solutes and temperature *I can make solutions using hot and cold temperatures. Agenda: Warm Up Video: Study Jams Quick Notes Solubility Lab Lab Questions Debrief ------------------ Warm up: What examples of solutions in your daily lives? What are examples of mixtures in your life? *What’s the difference between a solution & a mixture??   Video: Study Jams http://studyjams.scholastic.com/studyjams/jams/science/matter/mixtures.htm   Video: Study Jams -Mixtures **Glue this Note Catcher into your journal and answer the questions 1.) What is the definition of a mixture? 2.) Why is a mixture a physical change? 3.) What is a solvent? 4.) What is a solute? 5.) Give an example of a heterogeneous mixture 6.) Give an example of a homogeneous mixture. Quick Notes Solubility: The amount of a substance that can be dissolved in a given amount of solvent Solute: A substance dissolved in another substance (Salt, Sugar) Solvent: a substance capable of dissolving another substance (water) Solutions: a homogeneous mixture of 2 or more substances.    Solubility lab Solubility and Temperature LT: I can explain the relationship between solubility and temperature. In this lab you will be looking at solubility and temperature. Remember a solution is a type of mixture where a solute is dissolved in a solvent. In this lab we will be using salt as a solute and water as a solvent. Materials: cup of salt, thermometer, salt, 2 beakers, water (hot and cold) HOT WATER Procedure 1)   Fill one beaker up with a small amount of hot water 2)   Record the temperature of the water in the table below 3)   Fill your small plastic cup with 6 teaspoons of salt 4)   SLOWLY Add a small amount of the salt into the beaker of HOT water and stir with a plastic spoon 5)   Continue to SLOWLY add salt and stir until a small amount of salt will not dissolve. You will be able to tell when this happens because the salt will sit at the bottom of the cup.   6)   Measure the amount of salt left in the cup and record the amount on the table. (Estimate the amount) 7)   Find the amount of the salt that dissolved by subtracting your starting amount of salt and your ending amount of salt  (Estimate the amount) COLD WATER Procedure 8)   Fill one beaker up with a small amount of cold water 9)   Record the temperature of the water in the table. 10)          Fill your small plastic cup with 6 teaspoons of salt 11)          SLOWLY add a small amount of the salt into the beaker of COLD water and stir with a plastic spoon 12)          Continue to SLOWLY add salt and stir until a small amount of salt will not dissolve 13)          Measure and record the amount of salt left in your plastic container, and record the amount on the table.  (Estimate the amount) 14)          Find the amount of the salt that dissolved by subtracting your starting amount of salt and your ending amount of salt. (Estimate the amount) Results and Questions Temperature Amount of salt at start Amount of salt at end Amount of salt dissolved Hot Cold 1) How much salt dissolved in the hot water? 2) How much salt dissolved in the cold water? 3. What do you think happened with the salt would no longer dissolve in the water? 3) What is the relationship temperature between solubility and temperature? Explain how you came to this conclusion. 4) How does this apply to your life? Can you think of any life examples? Lab questions                              ***TOO much salt = over saturation                                       ex: Dead Sea -The solvent is “overwhelmed” and has more of the dissolved material than can be dissolved, or absorbed.           Ex: a sponge  Debrief:  What is the relationship between solubility and temperatur?