UNE CHEM 1011 EXAM QUESTIONS WITH CORRECT ANSWERS

UNE CHEM 1011 EXAM QUESTIONS WITH
CORRECT ANSWERS

A dipole-dipole force is characterized by - CORRECT ANSWER✔✔-the
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electrostatic attraction between the permanent dipoles in any polar
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molecule


Which of the following will have the strongest dipole-dipole attractions?
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- CORRECT ANSWER✔✔-NCl3
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A cohesive force - CORRECT ANSWER✔✔-is the result of the
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intermolecular forces that attract identical molecules | | | | |




A liquid is most likely to rise in a capillary tube when - CORRECT
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ANSWER✔✔-the adhesive forces are stronger than the cohesive forces | | | | | | | |




ΔHfrz is - CORRECT ANSWER✔✔-the energy change when a substance
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changes from the liquid phase to the solid phase
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The correct expression to calculate the heat required to convert 100 g of
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liquid water starting at 12 °C to steam at a final temperature of 135 °C is
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- CORRECT ANSWER✔✔-(m x c x ΔT)water + (n x ΔHvap) + (m x c x
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ΔT)steam

,In a phase diagram, the critical pressure represents - CORRECT
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ANSWER✔✔-the maximum pressure that a gas can exist | | | | | | |




In the phase diagram determine the state of CO2 at -25 °C and 25,000
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kPa - CORRECT ANSWER✔✔-Liquid
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Metallic solids - CORRECT ANSWER✔✔-are composed of atoms, with
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nuclei in a "sea" of delocalized electrons
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Methanol, CH3OH, is a common solvent used in organic chemistry labs.
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Methanol evaporates very quickly at room temperature and feels
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noticeably cold when evaporating. If the ΔHvap for methanol is 37.5
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kJ/mol, how much heat is removed when 1.1 g of methanol evaporates?
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- CORRECT ANSWER✔✔-1.29 kJ
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A solvent - CORRECT ANSWER✔✔-can be a solid, liquid, or gas
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When a solute is introduced to a solvent - CORRECT ANSWER✔✔-
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energy is released when solute-solvent interactions are formed
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Nonelectrolytes - CORRECT ANSWER✔✔-do not yield ions in solution | | | | | | | |

, Which of the following will have the lowest conductivity when dissolved
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in water? - CORRECT ANSWER✔✔-0.1 M sucrose, C12H22O11
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The solubility of a gas in a liquid - CORRECT ANSWER✔✔-decreases as
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the temperature of the solution increases
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Which of the following will have the highest vapor pressure? - CORRECT
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ANSWER✔✔-0.1 M NaCl in water | | | |




An aerosol is a colloid composed of - CORRECT ANSWER✔✔-a liquid
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dispersed in a gas | | |




Which of the following is true of soaps and detergents? - CORRECT
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ANSWER✔✔-Many soap or detergent molecules surround nonpolar | | | | | | |



substances to form colloidal particles that can easily be washed away
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The pressure of carbon dioxide in a bottle of champagne is 6.25 atm at
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25°C. What mass of CO2 is dissolved in a 0.750 L bottle of champagne?
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The Henry's Law constant for CO2 in water is 3.3 x 10-2 mol/L*atm? -
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CORRECT ANSWER✔✔-6.8 g | |




Hexane is commonly used in labs as a solvent for nonpolar compounds.
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What is the molality of 22.3 mg of vitamin D (C27H44O, 384.6 g/mol) in
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