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- Which one of the following molecules does not have a dipole moment? Justify your answer. (a) BrCI(b) CIF(c) BrF(d) O2(e) ICI2) Using principles of chemical bonding and/or intermolecular forces, explain each of the following: (a) Molecules of NF3 are polar, but those of BF3 are not. (b) MgCl2 and MgF2 (c) F2 and Br2 Note: Please explain, I am confused. Thank youFor each of the following molecules or molecular ions, give the steric number, sketch and name the approximate molecular geometry, and describe the direction of any distortions from the approximate geometry due to lone pairs. In each case, the central atom is listed first and the other atoms are all bonded directly to it. (a) TeH2 (c) PCI (b) AsF3 (d) XeF
- The structure of borazine, B3N3H6, is a six-membered ringof alternating B and N atoms. There is one H atom bondedto each B and to each N atom. The molecule is planar.(a) Write a Lewis structure for borazine in which the formalcharge on every atom is zero. (b) Write a Lewis structurefor borazine in which the octet rule is satisfied forevery atom. (c) What are the formal charges on the atomsin the Lewis structure from part (b)? Given the electronegativitiesof B and N, do the formal charges seem favorableor unfavorable? (d) Do either of the Lewis structuresin parts (a) and (b) have multiple resonance structures?(e) What are the hybridizations at the B and N atoms inthe Lewis structures from parts (a) and (b)? Would you expectthe molecule to be planar for both Lewis structures?(f) The six B¬N bonds in the borazine molecule are allidentical in length at 1.44 Å. Typical values for the bondlengths of B¬N single and double bonds are 1.51 Å and1.31 A°, respectively. Does the value of the B¬N…How would you answer part III of this FRQ? this is a non graded practice.10.57 In addition to ammonia, nitrogen forms three other hydrides: hydrazine (N,H), diazene (N,H,), and tetrazene (N,H,). (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 H,NNNNH,) decomposes above 0°C to hydrazine and nitrogen gas. Draw a Lewis structure for tetrazene, and calculate AHn for this decomposition. rxn
- Answer the following questions about the structures of ions that contain only sulfur andfluorine. (a) The compounds SF4 and BF3 react to form an ionic compound according to the following equation. SF4 + BF3 -----> SF3BF4 (i) Draw a complete Lewis structure for the SF3* cation in SF3BF4. (ii) Identify the type of hybridization exhibited by sulfur in the SF3* cation. (iii) Identify the geometry of the SF3* cation that is consistent with the Lewis structure drawn in part (a) (i). (iv) Predict whether the F-S-F bond angle in the SF3* cation is larger than, equal to, or smaller than 109.50°. Justify your answer.Consider the Lewis structure shown below.(a) Does the Lewis structure depict a neutral molecule or anion? If it is an ion, what is the charge on the ion? (b) What hybridizationis exhibited by each of the carbon atoms? (c) Arethere multiple equivalent resonance structures for the species?(d) How many electrons are in the p system of the species?For each pair, choose the compound with the higher lattice en-ergy, and explain your choice: (a) BaS or CsCl; (b) LiCl or CsCl.
- (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 observationsQUESTION 1 Consider the following species when answering the following question: (1) PC13 (ii) CC14 (1ii) TeCl4 (iv) X-F4 For which of the molecules is the molecular geometry (shape) the same as the VSEPR electron domain arrangement (electron pair arrangement)? A. (i) and (ii) B. (i) and (iii) C. (ii) and (v) D. (iv) and (v) E. (v) onlyDraw the Lewis structures for each of the following ionsor molecules. Identify those in which the octet rule is notobeyed; state which atom in each compound does not followthe octet rule; and state, for those atoms, how manyelectrons surround these atoms: (a) PH3, (b) AlH3, (c) N3-,(d) CH2Cl2, (e) SnF62-.
