5. (20 pts, 2 pts each) True-False questions from chapter 11. Place a T for true

Question

5. (20 pts, 2 pts each) True-False questions from chapter 11. Place a T for true or an F for false in the
blank provided. (WHEN YOU ANSWER PLEASE COPY PAST MY QUESTION IN YOUR ANSWERING SPACE AND JUST TYPE True/False in the blank spaces.)
_____ Condensed phase means liquid phase only.
_____ Inter-molecular forces in pure molecular substances are the forces within molecules that hold them
together as the repeating units of the matter.
_____ London forces are electrostatic forces that involve induced dipole moments.
_____ Hydrogen bonding can occur in CH3-F, but not in CH4.
_____ Phase changes at constant pressure are characterized by the temperature remaining constant until
one phase disappears.
_____ Hydrogen bonding accounts for the fact that ice is less dense than liquid water.
_____ Water boils at a lower temperature in New Orleans (which is below sea level) than it does at the
highest peak in the Ozark Mountains.
_____ For pure substances, volatility increases as attractive forces increase.
_____ On a phase diagram (Pvap versus T), the critical point is an example of a triple point.
_____ Solid metals tend to be ductile.
6. (20 pts, 2 pts each) True-False questions from chapter 13. Place a T for true or an F for false in the
blank provided.
_____ The First Law of Thermodynamics favors all solution processes.
_____ Miscible describes two liquids that are mutually soluble in all proportions.
_____ The solubility of solid solutes in liquid solvents tends to decrease as temperature increases.
_____ The osmolality (or formality) of a 0.30m K2CrO4 solution is 0.90 moles of ions /Kg.
_____ Boiling-point depression is one of the colligative properties.
_____

Explanation / Answer

___F__ Condensed phase means liquid phase only. __T___ Inter-molecular forces in pure molecular substances are the forces within molecules that hold them together as the repeating units of the matter. ___T__ London forces are electrostatic forces that involve induced dipole moments. __T___ Hydrogen bonding can occur in CH3-F, but not in CH4. ___T__ Phase changes at constant pressure are characterized by the temperature remaining constant until one phase disappears. ___F__ Hydrogen bonding accounts for the fact that ice is less dense than liquid water. __ F___ Water boils at a lower temperature in New Orleans (which is below sea level) than it does at the highest peak in the Ozark Mountains. ___T__ For pure substances, volatility increases as attractive forces increase. ___T__ On a phase diagram (Pvap versus T), the critical point is an example of a triple point. ___T__ Solid metals tend to be ductile. 6. (20 pts, 2 pts each) True-False questions from chapter 13. Place a T for true or an F for false in the blank provided. ___F__ The First Law of Thermodynamics favors all solution processes. _T____ Miscible describes two liquids that are mutually soluble in all proportions. ____T_ The solubility of solid solutes in liquid solvents tends to decrease as temperature increases. __F___ The osmolality (or formality) of a 0.30m K2CrO4 solution is 0.90 moles of ions /Kg. _F____ Boiling-point depression is one of the colligative properties. __T___ “Hydrophobic” means water-fearing; “hydrophilic” means water-loving. ___T__ Milk is an example of a liquid colloidal dispersion. ___T__ ppm = (mass %) × (10^4). ___T__ The cryoscopic constant, KFP (ºC/m), is a property of the solvent and does not depend on the chemical nature of the solute. __F___ Molar masses of large biochemical molecules are generally determined by osmotic pressure measurements rather than by experiments involving the other colligative properties.

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