• Document: ch9 and 10 practice test
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ch9 and 10 practice test 1. Which of the following covalent bonds is the most polar (highest percent ionic character)? A. Al •I B. Si •I C. Al •Cl D. Si •Cl E. Si •P 2. What is the hybridization of the central atom in ClO3– ? A. sp B. sp2 C. sp3 D. sp3d E. sp3d2 3. Which of the following solids would have the lowest melting point? A. KI B. KBr C. KCl D. KF 4. Estimate the enthalpy change, ΔH, for the reaction 2CO + O2 → 2CO2 given the following bond energies. BE(C≡O) = 1074 kJ/mol BE(O=O) = 499 kJ/mol BE(C=O) = 802 kJ/mol A. +2380 kJ B. +744 kJ C. +1949 kJ D. -561 kJ E. -744 kJ 5. Which one of the following molecules has an atom with an expanded octet? A. HCl B. AsCl5 C. ICl D. NCl3 E. Cl2 6. How many covalent bonds will a nitrogen atom usually form? A. 1 B. 2 C. 3 D. 5 E. 8 7. Which of the elements listed below has the greatest electronegativity? A. Mg B. Ga C. Si D. Ba E. Pb 8. Which of the atoms listed below is the most electronegative? A. Li B. Cs C. P D. As E. Ge 9. Which one of the following molecules is nonpolar? A. NH3 B. OF2 C. CH3Cl D. H2O E. BeCl2 10. The geometry of the ClF3 molecule is best described as: A. distorted tetrahedron B. trigonal planar C. tetrahedral D. T-shaped E. trigonal pyramidal 11. According to the VSEPR, theory the geometry of the atoms in the carbonate ion, CO32– is A. square planar. B. tetrahedral. C. pyramidal. D. trigonal planar. E. octahedral. Page 1 ch9 and 10 practice test 12. Which one of the following compounds does not follow the octet rule? A. NF3 B. CF4 C. PF5 D. AsH3 E. HCl 13. The bond between which of the following pairs of atoms would be the least polar (lowest percent ionic character)? A. C •Cl B. C •C C. C •H D. O •C E. N •C 14. The total number of bonding electrons in a molecule of formaldehyde (H2CO) is A. 3 B. 4 C. 6 D. 8 E. 18 15. A nonpolar covalent bond (pure covalent) would form between which one of the following pairs of atoms? A. Na •Cl B. H •Cl C. Li •Br D. Se •Br E. Br •Br 16. What is the hybridization on the central atom in NO3– ? A. sp B. sp2 C. sp3 D. sp3d E. sp3d2 18. The Lewis structure for a chlorate ion, ClO3• should show ____ single bond(s), ____ double bond(s), and ____ lone pair(s). A. 2, 1, 10 B. 3, 0, 9 C. 2, 1, 8 D. 3, 0, 10 E. 2, 1, 10 19. Each of the three resonance structures of NO3• has how many lone pairs of electrons? A. 7 B. 8 C. 9 D. 10 E. 13 20. According to VSEPR theory, which one of the following molecules should be trigonal bipyramidal? A. SF4 B. XeF4 C. NF3 D. SF6 E. PF5 21. The geometry of the CS2 molecule is best described as A. linear. B. trigonal planar. C. tetrahedral. D. bent. E. trigonal pyramidal. 22. Predict the molecular geometry and polarity of the SO2 molecule. A. linear, polar B. linear, nonpolar C. bent, polar D. bent, nonpolar E. None of the above. 23. Which one of the following is most likely to be a covalent compound? A. Rb2S B. SrCl2 C. CS2 D. CaO E. MgI2 Page 2 ch9 and 10 practice test 24. The electron dot formula for AsCl3 shows: (complete) A. a total of 84 electron dots B. three single bonds and 10 lone pairs C. two single bonds, one double bond, and 9 lone pairs D. one single bond, two double bonds, and 8 lone pairs E. three single bonds and one lone pair 25. Which of the following is a useful guideline for the application of formal charges? For neutral molecules: A. a Lewis structure in which there are no formal charges is preferred. B. Lewis structures with large formal charges (+2,+3 and/or -2,-3) are preferred. C. the preferred Lewis structure is one in which positive formal charges are on the most electronegative atoms. 26. Which of the following pairs of elements would be most likely to form an ionic compound? A. Cl and I B. Al a

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