UMass Amherst CHEM 112 - Chem 112 Exam 2 Review (3 pages)

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Chem 112 Exam 2 Review



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Chem 112 Exam 2 Review

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Pages:
3
School:
University of Massachusetts Amherst
Course:
Chem 112 - Gen Chem-Sci
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Exam 2 Review Ammonia NH 3 is used as a refrigerant At its boiling point of 33 C the standard enthalpy of vaporization of ammonia is 23 3 kJ mol What is the change in enthalpy when 53 9 g of ammonia is condensed at 33 C A 7 36 kJ B 7 36 kJ C 23 3 kJ D 73 7 kJ E 73 7 kJ As pure molecular solids which of the following exhibits dipole dipole intermolecular forces PH 3 SO 3 HCl and CO 2 A PH3 and HCl B PH3 only C SO3 and CO2 D SO3 HCl and CO2 E HCl only The predominant intermolecular attractive force in N 2 is A Covalent B induced dipole induced dipole C Dipole dipole D Ionic E dipole induced dipole Which action s will decrease the equilibrium concentration of an inert gas such as N2 in water 1 decreasing the temperature of the water 2 increasing the volume of water 3 decreasing the pressure of the gas above the liquid A 1 2 and 3 B 1 and 3 C 1 only D 2 only E 3 only What is the H3O concentration in 4 15E 3 M NaOH aq at 25 C Kw 1 01E 14 A 4 19E 17 M B 4 11E 11 M C 9 90E 13 M D 2 43E 12 M E 3 53E 12 M Which equation depicts aqueous hydrogen sulfide behaving as a Br nsted Lowry acid in water A H 2 S aq 2 OH aq SO 2 aq 2 H 2 g B HS aq H 3 O aq C H 2 S aq H 3 O aq H 2 S aq H 2 O H 3 S aq H 2 O D HS aq H 2 O HSO aq H 2 s E HS aq H 3 O aq H 2 S aq H 2 O Which of the following statements concerning intermolecular forces is are CORRECT 1 Dipole dipole attractions occur in all molecules that contain polar bonds regardless of whether the molecule has a dipole 2 Induced dipole induced dipole forces exist in all molecular solids 3 Hydrogen bonding only occurs in molecules containing OH bonds A 1 2 and 3 C 1 only E 2 only B 3 only D 1 and 2 Exam 2 Review In the following net ionic equation identify the Bronsted Lowry acid NO 2 aq HS aq A B C D HNO 2 aq S 2 aq NO2HSS2HNO2 What intermolecular force or bond is primarily responsible for the solubility of CH3OH in water A ionic bonding B ion dipole force C hydrogen bonding D covalent bonding E dipole dipole force What is the molar mass of a nonpolar molecular compound if 9 02 grams dissolved in 52 0 grams benzene begins to freeze at 2 15 C The freezing point of pure benzene is 5 50 C and the freezing point depression constant K fp is 5 12 C m A 3 77 g mol B 209 g mol C 265 g mol D 153 g mol E 297 g mol Which of the following molecules is expected to form hydrogen bonds in the pure liquid or solid phase ethanol CH3CH2OH acetic acid CH3CO2H acetaldehyde CH3CHO and dimethyl ether CH3OCH3 A acetaldehyde only B ethanol and acetic acid C acetaldehyde and dimethyl ether D ethanol only E ethanol and dimethyl ether The Henry s law constant for N2 in water at 25 C is 6 0E 4 mol kg bar What is the equilibrium concentration of N2 in water when the partial pressure of N2 is 401 mm Hg 760 mm Hg 1 atm 1 013 bar A 1 15E 3 m B 3 21E 4 m C 1 14E 3 m D 3 17E 4 m E 0 241 m The conjugate base of OH is A OH B O2 C H3O D OH E H Which of the following liquids will be miscible with water in any proportions ethanol CH 3 CH 2 OH carbon tetrachloride CCl 4 hexane C 6 H 14 and or formic acid HCO 2 H A carbon tetrachloride and formic acid B carbon tetrachloride and hexane C ethanol and formic acid D ethanol and carbon tetrachloride E ethanol carbon tetrachloride and hexane Exam 2 Review What is the mole fraction of water in a solution that is 25 4 by weight ethylene glycol The molar mass of ethylene glycol HOCH 2 CH 2 OH is 62 07 g mol A 9 00E 2 B 0 746 C 0 910 D 2 94 E 10 1 Which of the following liquids has the largest enthalpy of vaporization A C4H10 B C5H12 C C2H6 D C3H8 E C6H14 Ideally colligative properties depend only on the A molar masses of the solute particles in a solution B relative numbers of solute and solvent particles in a solution C hydrated radii of the molecules or ions dissolved in a solution D partial pressure of the gases above the surface of a solution E density of a solution Select the one best statement Boiling point elevation A occurs only when ionic solids are present B occurs only at sea level C occurs only for molecular solutes D results from a reduction in the vapor pressure of the solution E is the change in boiling point observed when one goes to a higher elevation When a glass tube with a small diameter is placed in water the water rises in the tube This is known as action A 12 6 meter by 13 1 meter pool of water has a depth of 2 85 meters What mass of silver ion is present in the reservoir if the concentration of silver ion is 0 180 ppm 1 m 3 1000 L assume the density of the solution is 1 00 g mL A 0 847 g B 7 13E 2 g C 84 7 g D 8 47E 2 g E 1 80E 4 g


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