Phet: Sugar & Salt Solutions Simulation *Go to Ms Bs website – click on S & S Sol Sim Phase II: Explain FQ: How does the amount of water influence the concentration of a solute? Answer the following in your science notebooks… Phase I: Explore 1. Select the “Macro” tab on the sim. 2. Check the “Show values” box for various measurements to appear. 3. For 1-2 minutes freely explore the sim by creating different solution combinations and concentrations. TIPS: *You can empty the shaker by clicking on it and moving it back and forth. *A shaker is empty when the color changes from white to gray. DO NOT USE ANYTHING IN THE “CONDUCTIVITY” BOX!!! Please answer the following questions using vocabulary such as increases, decreases, or stays the same. Include any relevant measurements that will provide further supporting evidence. a. What happens to the volume of water when you move the slider all the way to the right on the faucet on top of the screen? b. What happens to the volume of water when you move the slider all the way to the right on the faucet attached to the tub? 1. Find and click the “Reset All” button 2. Check Amt of water Salt Concentration the “Show (L) (mol/L) Values” box for 2.0 various measurements to 1.5 appear. 3. Make a 1.0 table like this 0.5 one… 4. Add water to tub until reach 2.0 L mark. 5. Pour all of the salt into the tub. 6. Record the salt concentration in the table 7. Change the volume by using EVAPORATION to reach each of the volumes in the chart 8. Construct a line graph of the amount of water vs. salt concentration. 9. Describe the relationships between the two variables. Phase III: Application 1. Select the “Reset All”. 2. Check the “Show values” box for concentration measurements to appear. 3. In the “Solute” box choose “Sugar”. 4. Follow steps 4-9 from the previous Phase using sugar instead of salt. Amount of Water (L) Sugar Concentration (mol/L) 2.0 c. What happens to the volume of water when you move the evaporation slider to “lots”? 1.5 1.0 0.5 d. Is it possible to have 0L of water in the tub? If yes, how? Phase IV: Investigation 1. Click “Reset all” 2. Move the “Conductivity” system into the water. 3. Record what happens with the light 4. Start adding salt 7. Describe what happens when sugar is dissolved in the water 8. Draw a quick picture of this situation 9. Use these two simulations to make a prediction of why salt dissolved in water conducts electricity, but sugar does not. 5. Record what happens to the light 6. Click “Remove Salt” (leave conductivity in) 7. Add salt until the concentration reads about 1.0 mol/L 8. Record if the light is shining or not 9. Add 0.5 L more water to the tank 10. Record observation of the light brightness 11. WITHOUT resetting anything, find two ways to increase the brightness of the light again 12. “Reset all” again. 13. Repeat steps 1-5 with sugar rather than salt…be sure to record observations of the conductivity system. PHASE V – MICRO 1. Click on “micro” 2. Add salt to the solvent 3. Describe what happens when salt is dissolved in the solvent. 4. Draw a quick picture of this solution 5. “Reset All” 6. Now add sugar PHASE VI – Water 1. Click on “Water” 2. Click and drag the Salt particles into the water. 3. Note what happens 4. Reset All 5. Click and drag the sugar molecules into the water 6. Note what happens.