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



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