CHEM 201 Problems CH 2, Fall 2016

Time : 60 minutes Chemistry 201 July 18, 2007 Summer 2007 Quiz 1 R. Sultan Name: KE Y Major : Student Number : Signature : Useful Information Planck’s constant h= 6.626 x 10°" Js Speed of light c=2.998 x 10° ms? Constant for the Bohr energy levels C =2.18 x 10°'® J (Rydberg’s constant) Inm = 10° m Mass of electron m= 9.109 x 10°! kg There are 20 questions. In each question, only ONE of the proposed answers is right. Circle the letter corresponding to the right answer. According to VSEPR theory, the geometry of the PH3 molecule is best described as A. linear. B. trigonal planar. S C. tetrahedral. , ae D. bent. H \ 4 €) trigonal pyramidal. H Which element has the following electron configuration? [Kr]5s24d105p3 A. Sn sb ¢..Pb: D. Bi E. Te Which of the following is the electron configuration of the Fe3+ ion? Ards 7 a_i fees 3d5 Fe: LAr} 4s 3d _ C. [Ar]4s2 343 7 D. [Arf3as 2, Rt: [An] 3d E. [Ar]4s2 3d9 Which one of the following molecules has a dipole moment? ‘es A. BeClo an ae B. Bro 7O Re Cf ts . C. BF3 . oO sf ™ si (0) 802 Rae Pe ee z E. CO? + _ A hi ov Sx 10 | 0 i) (@) | S © —_ Calculate the wavelength of a neutron that has a velocity of 200 cm/s. The mass of a neutron = 1.675 x 10-27 kg. p A= mu A. 1.98 x 10-°9m B. 216nm 34 C. 1.8 x 1050 m _ 6.bab x10 198 nm = r 2 * 5.05 mm 1.645 xlo t x 200 x10 24.9840" tm. = [448mon_| e What is the energy in joules of a mole of photons associated with red light of wavelength 7.00 x 102 nm? Cie E=N&= hy = AS @N, ; (B) 1.71 x 1053 34 9. 0 (73 ©. 4.72 « 10-435 = 6.626 x|0" '« 2.5% AO" _s 6.023.) D. 12.4kJ +.60 x10 xl0 e What is not common between the Lewis structures of NO3 , CO; and S03? : 0: | 5 i \8 a \ A. They are all isoelectronic. vA ( vane) N 2” ao gs gf ye ry _ yo B. They all have three resonance contributing structures. oO? o> (©ytheir resonance structures are not equivalent. No. Hay on! D. When considered from the viewpoint of VSEPR theory, they are yield trigonal planar v molecules. * E. For each molecule, each resonance structure has two single bonds and one double bond. // © In which one of the following molecules is the central atom sp2 hybridized? o> @)so2 Nao: Sxaeba te - "20 sp B. N20 QV £2 Sp C. BeCl2 Ais 8 i = ‘ af NPs :N=N=? S03 = 24 valme dsp E. PFs Ome idta--- s . na ‘ 2- .O: : QO Coe: He 1842 = 24 | = © Which one of the following elements is a transition element? A. Sr B. Pb . AS —_ Hg E. H © — Which one of the following molecules is nonpolar? A. NH3 © j= Ib a. ee C. CH3Cl VG, D. HO sn N7* @yyx e+ _ © N= =—WN?* e A possible set of quantum numbers for the last electron added to complete an atom of germanium (Ge) in its ground state is n I m, m ~ & * / . Laat eo to we 4b A. 4 0 0 + 1/2 bad B. 3 0 +] — 1/2 ©s OY -1% +1207 D. 3 1 +] — 1/2 E. 4 2, +2 -1/2 oat 4pos she. (d e) © Consider an element with the following electron configuration: [Xe]6s24f7. What is this element? A. Sm Eu C. Gd D. Am E. Cm Which one is a correct Lewis structure for ozone, 03? O. 4 8 es :0 = = O: \Y B. oo - o . < neil ami) ; * 9-0-6 Which one of the following compounds does not follow the octet/duet rule? Hint: Consider the BEST Lewis structure in each case. . we : 2 POs: Sebsaia 5 ©) Pocks a — P—-a ; 24 D. AsH ve \ * . 0° E. HCl ues > ht aha lov. en] The maximum number of electrons in a atom that have the following set of quantum numbers is: n=4 /=+3 mpe-2 m= +1/2 A. 0 ®1 C, 2 D. 6 E. 10 Which choice lists two elements with electron configurations that are well-known exceptions to the Aufbau principle? A. Cuand C t 10 (B) Mo and Ag Bis <4 ud> Aq: 5s Gd C. Cs and Cl D. Rb and Co E. Fe and Co Calculate the wavelength, in nanometers, of the light emitted by a hydrogen atom when its electron falls from the n = 7 to the n= 4 principal energy level. Recall that the energy levels of the H atom are given by: AE= En =-2.18 x 10-18 J (1/n2) A. 4.45 x 10-20 nm B. 2.17 10-6 nm C. 9.18 x 10-20 nm D. 1.38% 1014 nm C. » (© 2.17 « 103 nm A. sp B. sp2 C. sp3 (D)sp3d E. sp3d2 5+ tnt + fF : F: Aled) ec = 2.18i0"%(0.0421) = - 2.16 x10 Ome B16 x to?mm] What is the hybridization of As in the AsF4’ ion? Ps A ta 34 es —d= 26 F © _ “ in = dsp e The work function for potassium (K) is 2.25 eV. Calculate the kinetic energy of the ejected electron when a photon of wavelength 490 nm hits the surface of a potassium metal sheet. E= Ay = he = iogtald A. 4.78 eV r = 2.53 (B)0.28 eV E = 4, Y S KS & C..2:53 eV. 0 r D. 0.18 eV cy _ bKeé2b- p E. 3.65 eV work = 253-228 } 0.28 eN e The Lewis structure for a chlorate ion, C103 _, should show single bond(s), double bond(s), and lone pair(s). A. 2,1, 10 B. 3,0,9 Cc. 2,1,8 @)3.0, 10 E. 2,1, 10 wo? i te AR el +36 ) ao B-G-&|\ y G09) iO: fo) 0 0) or i we Wrule oa =" : 0