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Use VSEPR theory to draw structures, with ideal bond an-gles, for boric acid and the anion it forms in reaction with water.
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- 9. The following figure shows the potential energy as a function of the distance between two hydrogen atoms. (a) Label the axes (include reasonable units!) and indicate the equilibrium bond distance. (b) What is the energy when the atoms are infinitely far apart? (c) On the same plot, sketch what you think the potential energy of the anion H; might look like. Consider where you would put the equilibrium bond distance and how deep the potential energy dips down.Three main group elements, X, Y and Z, from three different groups inthe Periodic Table, each form a neutral trifluoride, i.e. XF3, YF3 andZF3. (a) To which three groups of the Periodic Table could the elementsX, Y and Z belong? Are any of these atoms X, Y or Zhypervalent in the trifluorides formed? (b) Use VSEPR theory to deduce the shapes of the molecules XF3,YF3 and ZF3, showing full working, and sketch these shapes (c) Only two of the three trifluorides have a non-zero dipole moment.For these molecules to which groups of the Periodic Table do thecentral atoms belong?Arrange the following in the order of the property indicated for each set–(a) F2, Cl2, Br2, I2(Increasing bond dissociation energy).(b) HF, HCl, HBr, HI (decreasing acid strength).(c) NH3, PH3, ASH3, SbH3, BiH3(decreasing base strength).
- Which of the following bonds are polar? Which is the more electronegative atom in cach polar bond? (a) B-F (b) Cl-CI (c) Se-O (d) H–I Arrange the bonds in cach of the following sets in order of inereasing polarity: (a) C-F, O–F, Be-F; (b) 0-CI, S-Br, C-P; (c) C-S, B–F, N-0.Thionyl chloride (SOCl₂) is a sulfur oxohalide used indus-trially to dehydrate metal halide hydrates. (a) Write a balancedequation for its reaction with magnesium chloride hexahydrate,in which SO₂ and HCl form along with the metal halide. (b) Drawa Lewis structure of SOCl₂ with minimal formal charges.(a) What is the trend in electronegativity going fromleft to right in a row of the periodic table? (b) How doelectronegativity values generally vary going down a columnin the periodic table? (c) True or false: The most easilyionizable elements are the most electronegative.
- By referring only to the periodic table, select (a) the most electronegativeelement in group 6A; (b) the least electronegativeelement in the group Al, Si, P; (c) the most electronegative elementin the group Ga, P, Cl, Na; (d) the element in the group K,C, Zn, F that is most likely to form an ionic compound with Ba.Which of the following is a resonance structure of compound X? N (A) OH NH (B) X NH O NH (C) N (D)Describe the molecule xenon trioxide, XeO3, usingfour possible Lewis structures, one each with zero, one,two, or three Xe¬O double bonds.
- Chlorine dioxide gas (ClO2) is used as a commercial bleachingagent. It bleaches materials by oxidizing them. In thecourse of these reactions, the ClO2 is itself reduced. (a)What is the Lewis structure for ClO2? (b) Why do you thinkthat ClO2 is reduced so readily? (c) When a ClO2 moleculegains an electron, the chlorite ion, ClO2-, forms. Draw theLewis structure for ClO2-. (d) Predict the O—Cl—O bondangle in the ClO2- ion. (e) One method of preparing ClO2is by the reaction of chlorine and sodium chlorite:Cl2(g) + 2 NaClO2(s)------>2 ClO2(g) + 2 NaCl(s)If you allow 15.0 g of NaClO2 to react with 2.00 L of chlorinegas at a pressure of 1.50 atm at 21 °C, how many gramsof ClO2 can be prepared?Consider the Lewis structure for the polyatomic oxyanionshown here, where X is an element from the third period(Na - Ar). By changing the overall charge, n, from 1- to2- to 3- we get three different polyatomic ions. For each ofthese ions (a) identify the central atom, X; (b) determine theformal charge of the central atom, X; (c) draw a Lewis structurethat makes the formal charge on the central atom equalto zero.Which of these statements about resonance is true?(a) When you draw resonance structures, it is permissibleto alter the way atoms are connected.(b) The nitrate ion has one long N¬O bond and two shortN¬O bonds.(c) “Resonance” refers to the idea that molecules areresonating rapidly between different bonding patterns.(d) The cyanide ion has only one dominant resonancestructure.(e) All of the above are true.