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Worksheet: Lewis Structure, Resonance, VSEPR, Molecular Polarity MULTIPLE CHOICE. 1) The total number of valence electrons in a phosphate ion is A) 29 B) 60 C) 32 1) D) 26 2) Which of the following Lewis structures does NOT fulfill the octet rule? . . . . A) H : O : C : : O : B) H : C :: N : · · · · · · H . . C) H : C : : O : · · H 2) . . . . D) : F : C : : C : F : · · · · · · · · H H 3) How many VSEPR electron groups are on the central atom in the Lewis structure . . H : C : : O : · · H A) 4 B) 2 C) 3 3) D) 1 4) According to VSEPR theory, predict which of the following triatomic molecules is bent . . . . . . . . . . . . . . A) H : O : H B) : O : : C : : O : C) : S : : C : : S : D) : O : : C : : S : · · 4) 5) For a molecule AX3 with four VSEPR electron groups on the central atom A, the bond angle ∠X-A-X is closest to A) 90° B) 180° C) 120° D) 109.5° 5) 6) The molecule AXY with four VSEPR electron groups on the central atom A would look like which one of the following 6) A) B) C) D) none of the above 1 . . . . . . 7) The molecular geometry of the molecule with a Lewis structure as : Cl : N : F : · · · · · · H 7) A) trigonal pyramidal B) linear C) bent D) trigonal planar E) tetrahedral 8) Which of the following molecules is nonpolar? A) HCN B) H2 O 8) C) HCl D) CO 2 PROBLEMS. Show work with proper Significant Figures and Units to receive credit. 9) Draw Lewis structures for the following species: a) Br2 ; b) HBr; c) HCN; d) H2 CO; e) CO 3 2- ; f) CHBr3 ; g) NHCl2 ; h) HOCl; More for thought: which ones are polar molecules? Answer: b,c,d,f,g,h 10) Write two resonance structures for HCO2 - (central C atom) 11) (a) Name compound Br 2 O7 ; (b) Write formula for sulfur tetrafluoride and dichlorine hexachloride dibromine heptoxide SF4 Cl2O6 12) Answer the questions by filling the spaces. 1 pt for each space unless otherwise stated. (H 2 O is used as an example). Molecules H2 O (example) Sum of all valence electrons 8 Lewis structure (3 pts each) PF4 + COCl 2 24 32 . . H : O : H · · Bond polarity polar C-O: Note: nonpolar O-H: polar C-F: polar △EN ≤ 0.4 Number of 3 VSEPR groups 4 on central atom Molecular bent (angular) trigonal planar geometry Bond angle ∠H-O-H = 109.5° 120 degrees Molecular polarity polar polar 2 P-F: polar 4 tetrahedral 109.5 degrees skip Answer Key Testname: WKST_IG_CHEMBONDING 1) C 2) B 3) C 4) A 5) D 6) C 7) A 8) D 9) 10) 11) 12) 3