Practice Questions on Chemical Bonding and Molecular Structure

University:
Shippensburg University of Pennsylvania
Course:
CHM 121 | Chemical Bonding
Academic year:

2022
Views:

393

Pages:

4
Author:

Prince Sampson

PRACTICE QUESTIONS FOR EXAM 4 1) Which of the following has eight valence electrons? A. Ti4+ B. Kr C. ClD. Na+ E. all of the above 2) In ionic bond formation, the lattice energy of ions ________ as the magnitude of the ion charges _______ and the radii ________. A. increases, decrease, increase B. increases, increase, increase C. decreases, increase, increase D. increases, increase, decrease E. increases, decrease, decrease 3) In which of the molecules below is the carbon-carbon distance the shortest? A. H2C CH2 B. H-C≡C-H C. H3C—CH3 D. H2C C CH2 E. H3C—CH2—CH3 4) Of the molecules below, the bond in ________ is the most polar. A. HBr B. HI C. HCl D. HF E. H2 5) The formal charge on nitrogen in NO3- is ________, where the Lewis structure of the ion is: A. B. C. D. E. -1 0 +1 +2 -2 6) The Lewis structure of the CO32- ion is ________. A. B. C. D. E. 7) The Lewis structure of N2H2 shows ________. A. a nitrogen-nitrogen triple bond B. a nitrogen-nitrogen single bond C. each nitrogen has one nonbonding electron pair D. each nitrogen has two nonbonding electron pairs E. each hydrogen has one nonbonding electron pair 8) The halogens, alkali metals, and alkaline earth metals have ________ valence electrons, respectively. A. 7, 4, and 6 B. 1, 5, and 7 C. 8, 2, and 3 D. 7, 1, and 2 E. 2, 7, and 4 9) How many equivalent resonance forms can be drawn for CO32-? (Carbon is the central atom.) A. 1 B. 2 C. 3 D. 4 E. 0 10) Electronegativity ________ from left to right within a period and ________ from top to bottom within a group. A. decreases, increases B. increases, increases C. increases, decreases D. stays the same, increases E. increases, stays the same 11) A nonpolar bond will form between two ________ atoms of ________ electronegativity. A. different, opposite B. identical, different C. different, different D. similar, different E. identical, equal 12) There are ________ valence electrons in the Lewis structure of CH3Cl. A. 14 B. 16 C. 18 D. 20 E. 22 13) The ion PO43- has ________ valence electrons. A. 14 B. 24 C. 27 D. 29 E. 32 14) The Lewis structure of AsH3 shows ________ nonbonding electron pair(s) on As. A. 0 B. 1 C. 2 D. 3 E. This cannot be determined from the data given. 15) The Lewis structure of PF3 shows that the central phosphorus atom has ________ nonbonding and ________ bonding electron pair(s). A. 2, 2 B. 1, 3 C. 3, 1 D. 1, 2 E. 3, 3 16) The formal charge on carbon in the molecule below is ________. A. B. C. D. E. 0 +1 +2 +3 -1 17) Using the table of average bond energies below, the ΔH for the reaction is ________ kJ. Bond: C≡C D (kJ/mol): 839 A. B. C. D. E. +160 -160 -217 -63 +63 C-C 348 H-I 299 C-I 240 C-H 413