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solution2_pdf - dang(rtd356 – H02 Solutions – Mccord...

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dang (rtd356) – H02: Solutions – Mccord – (52450) 1 This print-out should have 14 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points Dissociation of a solid is aided by 1. weak binding of species in the solid and strong interactions between the solvent and solute. correct 2. strong interaction between solvent molecules. 3. None of these is correct. 4. strong binding in the solid and weak solvent-solute interaction. Explanation: Weak intermolecular forces in the solute facilitate separation of its particles and strong attractive forces between solute and solvent facilitate dissociation of a solid. 002 10.0 points Some distilled water is added to an empty beaker. A gram of copper(II) nitrate is added to the beaker with stirring. After a few min- utes, what is in the beaker? 1. nitrogen gas, copper atoms, electrons, and water 2. a sticky material of copper hydronitrite 3. copper ions, nitrate ions, and water cor- rect 4. solid copper, nitrate ions, and water 5. solid copper(II) nitrate and water Explanation: All nitrates are soluble in water, so the cop- per(II) nitrate dissolves. Soluble ionic com- pounds are strong electrolytes, so the cop- per(II) nitrate also dissociates into its cation and anion parts: Cu + 2 and NO 3 . 003 10.0 points Both ammonia and phosphine (PH 3 ) are sol- uble in water. Which is least soluble and why? 1. phosphine; the P - H bonds are so strong that they cannot break to enable phosphine to hydrogen-bond with water. 2. ammonia; it is too small to be hydrated by water molecules. 3. ammonia; it does not form hydrogen bonds with water molecules. 4. phosphine; it does not form hydrogen bonds with water molecules. correct 5. ammonia; the N - H bonds are so strong that they cannot break to enable the ammonia to hydrogen-bond with water.
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