Name Separations of Food Dyes by Paper Chromatography 9-1 Date (b) Are the structures that have the N-C-O bond skeleton resonance forms of the structures that have the C-N-O bond skeleton? Explain. 31 (c) Considering the Lewis structures, formal charges of the atoms, and relative electronegativities of N, C. and O, specify the most plausible Lewis structures for cyanate ion, NCO, and isocyanate ion, CNO. (Spec- ify them using the assigned labels.) CNO structure(s): ; NCO structure(s): (d) Which structure for the isocyanate ion, CNO, is the least plausi bution? (Specify it using the as label.) n the rge distri

Name Separations of Food Dyes by Paper Chromatography 9-1 Date (b) Are the structures that have the N-C-O bond skeleton resonance forms of the structures that have the C-N-O bond skeleton? Explain. 31 (c) Considering the Lewis structures, formal charges of the atoms, and relative electronegativities of N, C. and O, specify the most plausible Lewis structures for cyanate ion, NCO, and isocyanate ion, CNO. (Spec- ify them using the assigned labels.) CNO structure(s): ; NCO structure(s): (d) Which structure for the isocyanate ion, CNO, is the least plausi bution? (Specify it using the as label.) n the rge distri

Chemistry: Principles and Practice

3rd Edition

ISBN:9780534420123

Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer

Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer

Chapter9: Chemical Bonds

Section: Chapter Questions

Problem 9.72QE: Write all resonance structures of chlorobenzene, C6H5Cl, a molecule with the same cyclic structure...

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Using the bond dissociation enthalpies in Table 8.8, estimate the enthalpy of combustion of gaseous methane, CH4, to give water vapor and carbon dioxide gas.
Three known isomers exist of N2CO, with the atoms in these sequences: NOCN; ONNC; and ONCN. Write resonance structures for each isomer and use formal charge to predict which isomer is the most stable.
Several Lewis structures can be written for perbromate ion, , the central Br with all single Br—O bonds, or with one, two, or three Br=O double bonds. Draw the Lewis structures of these possible resonance structures, and use formal charges to predict which makes the greatest contribution to the resonance hybrid.
Write Lewis structures for the following: (c) C2F6 (contains a C¬C bond), (d) AsO3 3 -, (e) H2SO3 (H is bonded to O), (f) NH2Cl.. Arrange the bonds in each of the following sets in order of increasing polarity: (a) C¬F, O¬F, Be¬F; (b) O¬Cl, S¬Br, C¬P; (c) C¬S, B¬F, N¬O. What is the Lewis symbol for each of the following atoms or ions? (a) K, (b) As, (c) Sn2 + , (d) N3 Write electron configurations for the following ions and determine which have noble-gas configurations: (a) Cd2+, (b) P3-, (c) Zr4+
(b) The Murchison meteorite that landed in Australia in 1969 contained 92 different amino acids, including 21 found in Earth organism A skeleton structure (single bond only) of one of these extraterrestrial amino acids is shown below. Draw a Lewis structure, and identify any atoms having a nonzero formal charge. H3N. C ČH2 ČH3 (c) Draw the orbital diagrams and Lewis symbols to depict the formation of Na* and CI ions from the atoms. Give the formula of the compound formed. (d) The predicted bond length for HF is 109 pm (the sum of the covalent radii of H, 37 pm and F, 72 pm), however the actual bond length for HF is shorter (92 pm). It was observed that the difference between predicted and actual bond lengths becomes smaller going down the halogen group from HF to HI Describe these observations
19. :O: || :0-N- O: Which of the following statements, if true, would support the claim that the NO3 ion, represented above, has three resonance structures? (A) The NO3 ion is not a polar species. (B) The oxygen-to-nitrogen-to-oxygen bond angles are 90°. (C) One of the bonds in NO3 is longer than the other two. (D) One of the bonds in NO3¯ is shorter than the other two.
Ortho-Dichlorobenzene, C6H4Cl2, is obtained when two ofthe adjacent hydrogen atoms in benzene are replaced withCl atoms. A skeleton of the molecule is shown here. (a) Completea Lewis structure for the molecule using bonds andelectron pairs as needed. (b) Are there any resonance structuresfor the molecule? If so, sketch them. (c) Are the resonancestructures in (a) and (b) equivalent to one another asthey are in benzene?
Ortho-Dichlorobenzene, C6H4Cl2, is obtained when two ofthe adjacent hydrogen atoms in benzene are replaced withCl atoms. A skeleton of the molecule is shown here. (a) Completea Lewis structure for the molecule using bonds andelectron pairs as needed. (b) Are there any resonance structuresfor the molecule? If so, sketch them. (c) Are the resonancestructures in (a) and (b) equivalent to one another asthey are in benzene?
Calculate the enthalpy change for the following reactions using the bond enthalpy given below. (Bond enthalpy/kJ : H−H = 436, C−H = 413, C=O = 799, O=O = 495, O−H = 463) (a) H2(g) + 1⁄2O2(g) → H2O(g) (b) CH4(g) + 2O2(g) → CO2(g) + 2H2O(l)
Common exceptions to the octet rule are compounds and polyatomic ions with central atoms having more than 8 electrons around them. Phosphorus pentafluoride, PF5; sulfur tetrafluoride, SF4; xenon tetrafluoride, XeF4; and tri-iodide ion, I3, are all examples of exceptions to the octet rule. (a) Draw the Lewis structures of these substances.(b) For which elements in these substances can theatoms have more than 8 electrons around them?(c) How can the atoms of the elements youidentified in Part (b) be surrounded by morethan 8 electrons?
In addition to ammonia, nitrogen forms three other hydrides: hydrazine (N2H4), diazene (N2H2), and tetrazene (N4H4).(a) Use Lewis structures to compare the strength, length, and order of the nitrogen-nitrogen bonds in hydrazine, diazene, and N2.(b) Tetrazene (atom sequence H2NNNNH2) decomposes above 08C to hydrazine and nitrogen gas. Draw a Lewis structure for tetrazene, and calculate ΔH°rxn for this decomposition.
Write Lewis structures for the following molecules or ions:(a) SbH3(b) XeF2(c) Se8 (a cyclic molecule with a ring of eight Se atoms)