Chemistry chapter 7 Quiz Key PDF

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chapter 7 quiz with corrected answer marked...

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Chap. 7 Chemistry quiz 1. According to the VSEPR model, the predicted molecular geometry of the SO 3 molecule is pyramidal. tetrahedral. trigonal planar. seesaw. Square planar. 2. What is the predicted molecular geometry of the CH 4 molecule according to the VSEPR model? tetrahedral trigonal pyramidal trigonal planar square planar seesaw 3. Using the VSEPR model, what is the predicted molecular geometry of the PCl 3 molecule? linear bent trigonal planar trigonal pyramidal tetrahedral 4. What is the predicted molecular geometry of the IBr 3 molecule according to the VSEPR model? tetrahedral T-shaped bent trigonal planar seesaw 5. According to the VSEPR model, which molecule is predicted to be linear? H 2S HCN BF 3 H 2CO SO 3 6. According to the VSEPR model, which molecule has a predicted tetrahedral molecular geometry? XeF 4 BF 3 AsF 5 CF 4 NH 3 7. Using the VSEPR model, predict the molecular geometry around the central atom in SO 3 2–. trigonal planar trigonal pyramidal tetrahedral trigonal bipyramidal

octahedral 8. What is the total number of electron domains around the central atom for a molecule having a Tshaped molecular geometry, such as BrF 3? 5 2 3 4 6 9. What is the number of lone electron pairs on the central atom of a molecule having a linear molecular geometry, such as CO 2? 1 2 3 0 4 10. According to the VSEPR model, a molecule with the general formula AB 5 with one lone pair on the central atom will have a ______ molecular geometry. tetrahedral trigonalbipyramidal square pyramidal octahedral seesaw 11. What is the molecular geometry of the thiocyanate anion, SCN –, as predicted by the VSEPR model? (Carbon is the central atom.) linear bent tetrahedral trigonal planar trigonal pyramidal 12. What is the molecular geometry of NO 2– as predicted by the VSEPR model? linear trigonal planar bent tetrahedral trigonal pyramidal 13. What is the molecular geometry of ClO3F as predicted by the VSEPR model?

trigonal pyramidal square planar square pyramidal tetrahedral octahedral

14. What is the molecular geometry of SiF62− as predicted by the VSEPR model? trigonal bipyramidal octahedral tetrahedral seesaw square pyramidal 15. According to the VSEPR model, what is the predicted electron-domain geometry around the central iodine atom in the ion lF 2– ? octahedral trigonal bipyramidal tetrahedral trigonal planar bent 16. According to the VSEPR model, what is the predicted Cl–C–Cl bond angle in CCl 4? 90° 109.5° 120° 145° 180° 17. What is the predicted O–C–O bond angle in CO 2? 60° 90° 109.5° 120° 180° 18. Which is the most reasonable prediction for the three F–Br–F bond angles in BrF 3? 90°, 90°, and 180° 86°, 94°, and 180° 86°, 86°, and 172° 94°, 94°, and 172° 120°, 120°, and 120° 19. Which one of the following molecules is nonpolar? NH 3 OF 2 CH 3Cl H 2O BeCl 2 20. Which one of the following molecules has a dipole moment of zero? CO CH 2Cl 2 SO 3

SO 2 NH 3 21. Predict the molecular geometry and polarity of the SO 2 molecule. linear, polar linear, nonpolar bent, polar bent, nonpolar trigonal planar, polar 22. Which one of the following molecules is polar? CH 4 CHBr 3 F2 CBr 4 CO 2 23. Which of the following is defined as the attractive forces between polar molecules? I. dispersion forces II. II. dipole-dipole interactions III. ion-dipole interactions I and III II only III only I, II, and III I only 24. Which substance should exhibit hydrogen bonding in the liquid phase? PH 3 He H 2S CH 4 CH 3OH 25. Which substance will exhibit hydrogen bonding between molecules? (CH3)3N CH 3–O–CH 3 CH3CH2–OH CH 3CH 2–F HI 26. The strongest intermolecular interactions between ethyl alcohol (CH 3CH 2OH) molecules arise from dipole-dipole forces. London dispersion forces. hydrogen bonding. ion-dipole interactions. carbon-oxygen bonds.

27. The strongest intermolecular interactions between hydrogen fluoride (HF) molecules arise from dipole-dipole forces. London dispersion forces. hydrogen bonding. ion-dipole interactions. ionic bonds. 28. Ammonia's unusually high melting point is the result of dipole-dipole forces. London dispersion forces. hydrogen bonding. covalent bonding. ionic bonding. 29. In which of the following compounds will the molecules not form hydrogen bonds with each other

30. Which kinds of intermolecular forces exist between propane molecules? I. dispersion forces II. dipole-dipole interactions III. ion-dipole interactions I only II only III only I, II, and III I and III 31. Which one of the following pure substance has both dispersion forces and dipole-dipole forces? HCl BCl 3 Br 2 H2 CO 2 32. Octane is a component of fuel used in internal combustion engines. The dominant intermolecular forces in octane are dipole-dipole forces. London dispersion forces. hydrogen bonding.

covalent bonds. carbon-hydrogen bonds. 33. Which of the following pure substances has the highest boiling point? CH 4 Cl 2 Kr CH 3Cl N2 34. Arrange the following in order of increasing boiling point: RbCl, CH3Cl, CH3OH, CH4. CH 3OH < CH 3Cl < RbCl < CH 4 CH 3OH < CH 4 < CH 3Cl < RbCl RbCl < CH 3 Cl < CH 3 OH < CH 4 CH 4 < CH 3OH < CH 3Cl < RbCl CH 4 < CH 3Cl < CH 3OH < RbCl 35. Indicate the type of hybrid orbitals used by the central atom in CCl 4. sp sp2 sp3 sp3d sp3d 36. Indicate the type of hybrid orbitals used by the central atom in SF 6. Sp sp2 sp3 sp3d sp3d2 37. In which molecule is the central atom sp 2 hybridized? SO 2 N 2O BeCl 2 NF 3 PF 5 38. A molecule with the formula AB 4 and a tetrahedral molecular geometry uses ________ to form itsσ bonds. sp hybrid orbitals sp 2 hybrid orbitals sp 3 hybrid orbitals sp 3 d hybrid orbitals sp 3 d 2 hybrid orbitals 39. Valence bond theory predicts that carbon will use ________ hybrid orbitals in the carbonate anion, CO 3 2–. sp sp 2 sp 3

sp 3 d sp 3 d 2 40. Valence bond theory predicts that sulfur will use ________ hybrid orbitals in sulfur dioxide, SO 2. sp sp 2 sp 3 sp 3 d sp 3 d 2 41. For which one of the following molecules is the indicated type of hybridization not appropriate for the central atom? BeCl 2; sp 2 SiH 4; sp 3 BF3; sp2 C2H2; sp H2O; sp 42. What is the hybridization of phosphorus in PCl 3? sp3 sp2 sp sp3d sp3d2 43. Which is the correct hybrid orbital diagram representing the hybridization of iodine in ICl 5?

44. Which is true concerning the molecular geometry of SF 6? The predicted F–S–F bond angle is 60°. The predicted F–S–F bond angle is 90°. The predicted F–S–F bond angles are 90° and 120°. The predicted F–S–F bond angles are 90° and 180°. The predicted F–S–F bond angles are 60°, 120°, and 180°. 45. According to the VSEPR model, a molecule with the general formula AB 4 with two lone pairs on the central atom will have a _____ molecular geometry. tetrahedral square pyramidal square planar octahedral seesaw...