Chapter 11: Solutions 9. Which of the diagrams in the figure best represents an

Question

Chapter 11: Solutions 9. Which of the diagrams in the figure best represents an aqueous solution of NasSO? A) I B) II C) III D) either I or III E) none of these is correct 10. Which of the following statements regarding the rule "like dissolves like" is incorrect? ) Since cooking oil is composed primarily of hydrocarbons, it is insoluble in water B) Iodine, la, is very soluble in water. C) Ethanol, CH CH2OH, is water-soluble. D) Cooking oil, a nonpolar substance, is soluble in hexane, CoH E) Potassium nitrate, KNOs, is soluble in water. 11. Which of the following should be most soluble in water? A) Vitamin C (a very good hydrogen bonder) B) Vitamin A (a mostly nompolar molecule) C) CoH) D) (s) E) 0:(8) 12. Which of the following statements regarding solubility is incorrect? A polar compound will dissolve an ionic compound due to ion-dipole interacti A nonpolar solvent will not interact strongly enough with ions to dissolve an ionic compound. Nonpolar liquids will dissolve in one another because the intermolecular forces in the pure liquids are weak, and there is an increase in entropy Most solids are more soluble at higher temperature than at a lower temperature of the solvent. Most gases are more soluble at a higher temperature than at a lower temperature of the solvent. A) ons. B) C) D) E)

Explanation / Answer

9) OPtion B

picture II represents the Na+ ions and SO4-2 ions separately.

10) OPtion B

I2 is not soluble in water. As it is non -polar . Thus incorrect statement(does not follow like dissolves like rule)

11)OPtion A

Vitamin c is a good hydrogen bonder so easily dissolved in water

while the others are mostly non polar hence do not dissolve in wate.

12)OPtion E

The dissolution of gases is exothermic process and is favored only at lower temperatres.

Thus option E is wrong while the others are correct.

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