Which of the following molecules have dipole moments? (a) CS2 (b) SeS2 (c) CCl2F2 (d) PCl3 (P is the central atom) (e) ClNO (N is the central atom)
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Which of the following molecules have dipole moments?
(a) CS2
(b) SeS2
(c) CCl2F2
(d) PCl3 (P is the central atom)
(e) ClNO (N is the central atom)
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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?Write all resonance structures of chlorobenzene, C6H5Cl, a molecule with the same cyclic structure as benzene. In all structures, keep the CCl bond as a single bond. Which resonance structures are the most important?Identify the electron pair geometry, the molecular structure of each, and the polarity of the following molecules: (a) ClNO (N is the central atom) (b) Cl2CO (C is the central atom) (c) Cl2SO (S is the central atom) (d) SO2F2 (S is the central atom) (e) XeO2F2 (Xe is the central atom) (f) ClOF2 + (Cl is the central atom)
- Consider the molecules SCl2, F2, CS2, CF4, and BrCl.(a) Which has bonds that are the most polar?(b) Which molecules have a dipole moment?Identify the electron pair geometry and the molecular structure of each of the following molecules:(a) ClNO (N is the central atom)(b) CS2(c) Cl2CO (C is the central atom)(d) Cl2SO (S is the central atom)(e) SO2F2 (S is the central atom)(f) XeO2F2 (Xe is the central atom)(g) ClOF2+ (Cl is the central atom)Which of the following molecules have dipole moments? (a) CS2 (b) SeS2 (c) CCl2F2 (d) PCl3 (P is the central atom) (e) ClNO (N is the central atom) Please show work when calculating answers.
- Consider the collection of nonmetallic elements O, P, Te,I, and B. (a) Which two would form the most polar singlebond? (b) Which two would form the longest single bond?(c) Which two would be likely to form a compound of formulaXY2? (d) Which combinations of elements would likelyyield a compound of empirical formula X2Y3?(a) Describe the molecule xenon trioxide, XeO3, using four possible Lewis structures, one each with zero, one, two, or three Xe—O double bonds. (b) Do any of these resonance structures satisfy the octet rule for every atom in the molecule? (c) Do any of the four Lewis structures have multiple resonance structures? If so, how many resonance structures do you find? (d) Which of the Lewis structures in (a) yields the most favorable formal charges for the molecule?In developing the concept of electronegativity, Pauling used the term excess bond energy for the difference between the actual bond energy of X¬Y and the average bond energies of X¬X and Y¬Y (see text discussion for the case of HF). Based on the values as shown, which of the following substances contains bonds with no excess bond energy?(a) PH3 (b) CS2 (c) BrCl (d) BH3 (e) Se8
- 32. Which term refers to how strongly an atom of an element attracts electrons in a chemical bond with another atom? (A) lonization energy (B) Atomic radius (C) Melting point (D) Electronegativity 33. Which of the following would have a trigonal pyramidal geometry? (A) NO2 (B) Оз (C) H2O (D) NH3 34. Calculate the molarity of a solution in which 360. grams of glucose, C6H12O6, are dissolved in enough water to make 250. mL of solution. (А) 1.0 М (В) 2.0 М (С) 4.0 М (D) 8.0 M 35. All of the following are ways to increase the rate of dissolving sugar except – (A) Increasing the mass of sugar (B) Crushing the sugar into a fine powder (C) Stirring with a spoon (D) Increasing the temperature of the waterUrea, (NH2)2CO, is used in plastics and fertilizers. It is also the primary nitrogencontaining substance excreted by humans.(a) Which bonds in the molecule are polar, and which are nonpolar?(b) Which is the most polar bond in the molecule? Which atom is the negative end of the bond dipole?(a) Describe the molecule xenon trioxide, XeO3, usingfour possible Lewis structures, one each with zero, one,two, or three Xe¬O double bonds. (b) Do any of theseresonance structures satisfy the octet rule for every atomin the molecule? (c) Do any of the four Lewis structureshave multiple resonance structures? If so, how many resonancestructures do you find? (d) Which of the Lewisstructures in part (a) yields the most favorable formalcharges for the molecule?
