CHM 261, QUIZ 13 PDF

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Fall'18 quiz 13 questions and answers...

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Name: __________________________ Date: _____________ 1. Neon atoms are attracted to each other by A) dipole-dipole forces. B) London dispersion forces. C) hydrogen bonding. D) covalent bonding. E) intramolecular forces. 2. When the electron cloud of a molecule is easily distorted, the molecule has a high _____________. A) polarity B) polarizability C) dipole moment D) van der Waals radius E) compressibility 3. Which of the following atoms should have the smallest polarizability? A) Si B) S C) Te D) Bi E) Br 4. The strongest intermolecular interactions between hydrogen sulfide (H2S) molecules arise from A) dipole-dipole forces. B) London dispersion forces. C) hydrogen bonding. D) ion-dipole interactions. E) disulfide linkages. 5. The strongest intermolecular interactions between hydrogen fluoride (HF) molecules arise from A) dipole-dipole forces. B) London dispersion forces. C) hydrogen bonding. D) ion-dipole interactions. E) ionic bonds.

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6. Which of the following pairs of molecules can form hydrogen bonds between them? A) HCl and HI B) CH3OH and NH3 C) CH4 and H2O D) SO2 and CH2O E) H2 and O2 7. Which of the following should have the highest boiling point? A) CF4 B) CCl4 C) CBr4 D) CI4 E) CH4 8. A system delivers 225 J of heat to the surroundings while delivering 645 J of work. Calculate the change in the internal energy, E, of the system. A) –420 J B) 420 J C) –870 J D) 870 J E) –225 J 9. Cold packs, whose temperatures are lowered when ammonium nitrate dissolves in water, are carried by athletic trainers when transporting ice is not possible. Which of the following is true of this reaction? A) H < 0, process is exothermic B) H > 0, process is exothermic C) H < 0, process is endothermic D) H > 0, process is endothermic E) H = 0, since cold packs are sealed 10. Which of the following is not a state function? A) internal energy B) volume C) work D) pressure E) enthalpy

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Answer Key 1. 2. 3. 4. 5. 6. 7. 8. 9. 10.

B B B A C B D C D C

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