UNE 1011 midterm| 189 Questions| With Complete Solutions

Strong electrolytes: ciate almost completely into ions in solution b. only yield a small fraction of ions in solution c. are always dissolved ionic compound d. Can not be covalent compounds correct answer: a. dissociate almost completely into ions in solution Hexane is commonly used in labs as solvent for non polar compounds. what is the molality of 22.3 mg of vitamin D (C27H44O, 384.6 g/mol) in 50 mL of hexane? Hexane has a density of 0.661 g/mol correct answer: 1.75 X 10^-3 m A foam is a collie composed of correct answer: a gas dispersed in a liquid the solubility of a solid in a liquid typically _____ (increases/decreases) with ______ (increasing/decreasing) temperatures with a few exceptions. correct answer: typically increases with increasing temperatures when a solute is introduced to a solvent: a. energy is released by forming solute-solute and solvent-solvent interactions b.a solution will always form c. energy is released when solute-solvent interactions are formed d. a solution will only form if energy released by salvation is low correct answer: c. energy is released when solute-solvent interactions are formed Which of the following will have the lowest freezing point: a. 0.1 M NaCl in water b. 0.5 M NaCl in water c. 1.0 M NaCl in water d. 2.0 M NaCl in water correct answer: d. 2.0 M NaCl in water an ideal solution correct answer: is formed with no energy change which of the following will have the lowest conductivity when dissolved in water? a. 0.1 M potassium chloride KCl b. 0.1 M sodium sulfate Na2SO4 c. 0.1 M calcium nitrate Ca(Na3)2 d. 0.1 M sucrose, C12H22O11 correct answer: d. 0.1 M sucrose C12H22O11 true or false: many soap or detergent molecules surround non polar substances to form collide particles that can easily be washed away correct answer: true