Chapter 15 HW-1 - Chapter 15 HW Created: 4:43:30 PM CDT...

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Chapter 15 HW Created: 4:43:30 PM CDT Student: _________________________________________________________ 1. If a solute dissolves in an endothermic process A. H bonds must exist between solvent and solute. B. strong ion-dipole forces must exist in the solution. C. the solute must be a gas. D. the entropy of the solution is immaterial. E. the entropy of the solution must be greater than that of its pure components. 2. When two pure substances are mixed to form a solution A. heat is released. B. heat is absorbed. C. there is an increase in entropy. D. there is a decrease in entropy. E. entropy is conserved. 3. A solution of sucrose (sugar) in water is in equilibrium with solid sucrose. If more solid sucrose is now added, with stirring, A. the concentration of the solution will increase. B. the concentration of the solution will decrease. C. the concentration of the solution will remain the same. D. the volume of solution will increase. E. a supersaturated solution will be produced. 4. Which of the following pairs of ions is arranged so that the ion with the smaller charge density is listed first? A. K + , Rb + B. Cl - , K + C. Cl - , Br - D. Ca 2+ , Ba 2+ E. None of these pairs are arranged in this way. 5. Which of the following pairs of ions is arranged so that the ion with the larger (i.e., more negative) heat of hydration is listed first? A. Br - , K + B. Mg 2+ , Sr 2+ C. Ca 2+ , Sc 3+ D. Na + , Li + E. None of these are arranged in this way. 6. A solution of potassium hydroxide is in equilibrium with undissolved solute at 45°C. What will happen if the temperature is raised to 50°C? (Δ H soln = - 57.6 kJ/mol) A. The mass of dissolved KOH will increase.
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B. The mass of dissolved KOH will decrease. C. The mass of dissolved KOH will be unchanged. D. The mass of water in the solution will increase. E. More information is needed in order to make a reliable prediction. 7. The Henry's Law constant ( k ) for carbon monoxide in water at 25°C is 9.71 × 10 -4 mol/(L·atm). How many grams of CO will dissolve in 1.00 L of water if the partial pressure of CO is 2.75 atm? A. 3.53 × 10 -4 g B. 2.67 × 10 -3 g C. 9.89 × 10 -3 g D. 7.48 × 10 -2 g E. none of these choices is correct 8. Methane has a Henry's Law constant ( k )of 9.88 × 10 -2 mol/(L·atm) when dissolved in benzene at 25°C. How many grams of CH 4 will dissolve in 3.00 L of benzene if the partial pressure of CH 4 is 1.48 atm? A.
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Chapter 15 HW-1 - Chapter 15 HW Created: 4:43:30 PM CDT...

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