Practice Questions for Exam 2 CH 1010 Fall 2023 ver 1

CH 1010 Practice Questions for Exam 2 Page 3 23. Arrange the bonds by increasing polarity: S—S, S—Br, S—Cl. 24. A disguised portion of the non-metals part of the periodic table is shown below. The compound XZ 2 … A. has polar bonds X— Z with the δ+ on the X. B. has polar bonds X— Z with the δ+ on the Z. C. has non-polar X—Z bonds. D. is ionic with cations of X 2+ . E. is ionic with cations of Z + . 25. Which substance has both covalent and ionic bonds? A. NH 4 Br( s ) B. CH 2 Cl 2 ( l ) C. KI( s ) D. SiF 4 ( g ) 26. Arrange the following polyatomic ions by increasing negative charge. ClO 4 x PO 4 x CO 3 x 27. Name the polyatomic ions in the above question. 28. Which ionic compound in each pair has a smaller lattice energy? Pair I: LiF or NaF Pair II: KF or CaF 2 A. LiF and KF B. LiF and CaF 2 C. NaF and KF D. NaF and CaF 2 29. Which of the following solids would have the highest melting point? Which the lowest? A. NaI C. MgCl 2 B. NaF D. MgO 30. Which represents a valid Lewis structure for dinitrogen tetraoxide, N 2 O 4 ? 31. The Lewis structure of AsCl 3 has ____ single bonds, ____ double bonds and ____ lone pairs. 32. Which of the following will have a Lewis structure in which central atom must exceed the octet rule? A. SF 4 D. NO 2 + B. CS 2 E. ClF 3 C. CF 4 F. NO 2 − 33. Which of the following ions will exhibit delocalized bonding? NO 2 − NO 2 + N 3 − 34. What is the approximate C—O bond order in the carbonate ion, CO 3 2 − ? 35. Given the following molecule, what are the formal charge on nitrogen atoms a, b and c respectively. C H N N N H H a b c .. N N O O O O .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. N N O O O O A B .. .. .. .. N N O O O O .. .. .. .. .. .. N N O O O O C D