CHEM 1212: Final Exam Questions and Answers

CHEM 1212: Final Exam Questions and Answers Colligative Properties - CORRECT ANSWER-properties of solution, such as freezing point and boiling point, which depend on the concentration of solute particles dissolved in the solvent Freezing Point Depression Equation - CORRECT ANSWERMolality - CORRECT ANSWER-moles of solute per kg of solvent Molality= - CORRECT ANSWERWhat is the definition of colligative properties? (Antifreeze) - CORRECT ANSWERproperties of a solution that depend on the concentration of solute dissolved in the solvent What is the difference between solute and solvent? (Antifreeze) - CORRECT ANSWERThe solute is what is dissolved, and the solvent is what is doing the dissolving. What is the difference between molality and molarity? (Antifreeze) - CORRECT ANSWER-molality=mol/kg molarity=mol/L What is the difference between freezing point and melting point? (Antifreeze) - CORRECT ANSWER-There is no difference between the melting point and boiling point. The freezing point and boiling point depends on the direction of the reaction -- whether a solid or liquid is being formed. An antifreeze solution contains 25 mL of ethylene glycol and 75 mL of water. What is the molality of the solution? (density of H2O = 1.00 g/mL and density of C2H4(OH)2 = 1.11 g/mL) (Antifreeze) - CORRECT ANSWER-5.96 m What will be the freezing point of the antifreeze solution in the question above? (Antifreeze) V of C2H4(OH)2 (mL): 25 mL V of H2O (mL): 75 mL Density of H2O (g/mL): 1.00 g/mL Density of C2H4(OH)2 (g/mL): 1.11 g/mL Kf of H2O: 1.86 *C/m Tf of H2O: 0 *C - CORRECT ANSWER--11.09 *C A different antifreeze solution contains 45 mL of ethylene glycol and 55 mL of water. What will be the freezing point of this new solution? (Antifreeze) Density of H2O (g/mL): 1.00 g/mL Density of C2H4(OH)2 (g/mL): 1.11 g/mL Kf of H2O: 1.86 *C/m Tf of H2O: 0 *C - CORRECT ANSWER--27 *C Based on your results, which of the following antifreeze solutions will be the best at protecting your radiator from freezing? (Antifreeze)