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- Given the bonds C N, C H, C Br, and S O, (a) which atom in each is the more electronegative? (b) which of these bonds is the most polar?Which of these molecules is least likely to exist: NF5, PF5, SbF5, or IF5? Explain why.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+
- Draw Lewis structures for the following: (a) SiH4, (b) CO,(c) SF2, (d) H2SO4 (H is bonded to O), (e) ClO2-, (f) NH2OH.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?Car2, (uy the NIT DOnI I NI3. 9. Write Lewis structures for the following molecules and ions: (a) OF2, (b) N2F2, (c) SizH6, (d) OH"
- (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(a) True or false: The hydrogen atom is most stable when ithas a full octet of electrons. (b) How many electrons must asulfur atom gain to achieve an octet in its valence shell? (c) Ifan atom has the electron configuration 1s22s22p3, how manyelectrons must it gain to achieve an octet?Draw Lewis structures for HFO4, HFO3, HC0O4, HC0O3, HCO2. (These molecules have the halogen atom as the central atom. All O atoms are attached to the halogen. The hydrogen atom is bonded to one of the O atoms.) Use formal charges to determine which molecule is least likely to occur in nature. (A) HFO4 (B) HC(O2 (C) HC!O3 (D) HFO3 (E) HC\O4 DO000
- Except for nitrogen, the elements of Group 5A(15) all form pentafluorides and most form pentachlorides. The chlorine atoms of PCI5 can be replaced with fluorine atoms one at a time to give, successively, PCI4F, PCI3F2, ..., PF5. (a) Given the relative sizes of F and Cl, would you expect the first two F substitutions to be at axial or equatorial positions? О axial O equatorial This answer has not been graded yet. (b) Which of the five fluorine-containing molecules have no dipole moment? (Select all that apply.) O PCI3F2 O PCI2F3 O PCIF4 O PF5 O PCI4FH. H. H. H. H. The diagram above shows two resonance structures for a molecule of C6H6. The phenomenon shown in the diagram best supports which of the following claims about the bonding in C6H6 ? (A) In the C6H6 molecule, all the bonds between the carbon atoms have the same length. (B) Because of variable bonding between its carbon atoms, C6H6 is a good conductor of electricity. (C) The bonds between carbon atoms in C6H6 are unstable, and the compound decomposes quickly. The C6H6 molecule contains three single bonds between carbon atoms and three double bonds between (D) carbon atoms. IIUDraw the Lewis structures and determine which of these molecules is least likely to exist. (A) H3S+ (B) H3O+ (С) НзО- (D) H3S- (E) OH- Draw all 5 structures with 1 central atom. All of the other atoms are attached to the central atom.
