nguyen (qkn57) – HW2 - Physical Equilibria II – shear – (51530) 1 This print-out should have 15 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. The simpler calculations for these topics are covered in ALEKS. Do them before attempt- ing the calculations in this homework. 001 10.0 points Water causes many electrolytes to dissociate 1. because the dispersion forces between ion and solvent are strong. 2. because it undergoes hydrogen bonding to large halide ions. 3. because water molecules are dipoles and the dipoles orient in an energetically favorable manner to solvate the ions. correct 4. because of repulsive interactions between ions in the crystalline state. Explanation: The more negative end of the water molecule orients toward the cation and the more positive end orients toward the anion; the ions remain apart. 002 10.0 points Dissociation of a solid is aided by 1. None of these is correct. 2. weak binding of species in the solid and strong interactions between the solvent and solute. correct 3. strong interaction between solvent molecules. 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. 003 10.0 points C 6 H 12 will most likely dissolve in which sol- vent? 1. H 2 O 2. HF 3. BaCl 2 4. NCl 3 5. CCl 4 correct Explanation: C 6 H 12 is a nonpolar molecule. Like dis- solves like, so the solvent most likely to dis- solve C 6 H 12 will be nonpolar. CCl 4 is nonpo- lar. 004 10.0 points For gases that do not react chemically with water, the solubility of the gas in water gen- erally (decreases, increases) with an increase in the pressure of the gas and (decreases, in- creases) with increasing temperature.
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