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Name: __________________________________ Date: ______________ Period: ____ WS Solutions and Solubility 1. A solution consists of a _____________________ dissolved in a _________________. 2. A solution is a _________________________ mixture. (which means _______ throughout) Is this type of mixture a pure substance? Yes or No Explain. _______________________________ ______________________________________ 3. Classify the following materials as: solution (S) or heterogeneous mixture (HM) or Neither (N) ____ a. smoky air ____ f. salt water (NaCl in H2O) ____ b. sugar water (C12H22O11 in H2O) ____ g. milk ____ c. vinegar (HC2H3O2 in H2O) ____ h. soda with bubbles ____ d. oil-based paint ____ i. pure distilled water (H2O) ____ e. pure iodine (I2) ____ j. ethanol in water (C2H5OH in H2O) 4. A solution is formed by adding methanol, CH3OH, to water. Identify each of the following intermolecular attractions as breaking or forming in the solution process: (circle answers) breaking / forming methanol – methanol breaking / forming water – water breaking / forming methanol – water 5. In general, the stronger the intermolecular attractions between solute and solvent molecules, the _______________ the solubility. 6. In general, the _____________ the intermolecular attractions between solute and solute molecules, the lower the solubility. 7. Match each term with the correct description: nonelectrolyte strong electrolyte weak electrolyte ____ ____ ____ A. partially dissolves as ions and conducts to some extent B. completely dissociates into ions and conducts C. dissolves, but does not conduct 8. Define “solubility”: ___________________________________________________________________ 9. Match each term with the correct description: saturated ____ A. solution with less than the max amount of solute dissolved supersaturated ____ B. solution with exactly the max amount of solute dissolved unsaturated ____ C. solution with more than the max amount of solute dissolved 10. High temp. makes ______________ less soluble, but make _____________ more soluble. 11. High pressure makes _____________ more soluble, but has no effect on the solubility of ___________. 12. Why do sodas left open out of the fridge go “flat”? __________________________________________. 13. Complete the phrase that describes the types of substances that will generally dissolve in each other: _______ dissolves _______. Therefore, polar solvents (like water) can dissolve ___________ solutes (like alcohols, sugars, ionic compounds, etc.). But nonpolar solutes (like fats, oils, hydrocarbons, etc.) will dissolve in _______________ solvents. 14. List three actions you could take to make a solid dissolve better in a liquid: ____________________ ____________________ ____________________ 15. List three actions you could take to make a gas dissolve better in a liquid: ____________________ ____________________ ____________________ For # 16-20, consider the graph of solubility curves below. 16. Which substance has the lowest solubility at 20oC? __________ 17. If 40 g of KCl is dissolved in 100 g of water at 80oC, then the solution is __________________. 18. If 80 g of KNO3 is dissolved in 100 g of water at 40oC, then the solution is __________________. 19. If 80 g of KNO3 is dissolved in 100 g of water at 50oC, then the solution is __________________. 20. How many grams of NH4Cl can dissolve in 100 g of water at 70oC? _______ g