Practice Exam B - Fall 2006 Exam 1V Morlino There are 25...

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Unformatted text preview: Fall 2006 Exam 1V Morlino There are 25 questions plus 2 bonus questions on this exam. Select the BEST answer to each of the following questions. PLEASE READ THE QUESTIONS CAREFULLY! 1) In which atom is the ZS orbital highest in energy? l Be 2) In which atom are the 3s and 3p orbitals equal in energy? C 0 He H | none of the above 3) Unpaired electrons in degenerate orbitals have spins. elemental parallel opposite perpendicular unordered 4) How many electrons are there in a filled n = 3 principal shell? 2 6 8 58 32 A-l Fall 2006 Exam IV Morlino 5) Which of the following orbital diagrams is not allowed? A) “AW “A” 5"“! "—7‘_"__' 1 ' J. -' r ‘ y r l g _ A. 3! ‘ ' - 1 1 n l 1 . r I u ~ . 4, . E .l. :7 .2; .1}- _ .,' J C) | l l i I ' r - . l i I i I J * L_A A __ - J___'______ _. —_.J! ______.__._ - l :"I 7.; "y D) 1' a t J 1 — : E _ ,- 1 ; L I , l , , 7, E ‘ o , A ,- . w! E) 6) What is the ground state electron configuration of Mg2+7 [Ar] 352 [Ne] 35221310 [Ne] 352 157—2522136352 1522922196 7) According to the Aufbau principle which sublevel is filled after the 55 sublevel? 5p 4d 3d 4f 5d A-2 Fall 2006 Exam IV Morlino 8) How many valence electrons are there in :1 Te atom? 2 3 U] 9) How many £933. electrons does an atom of Br have? 33 35 18 ' 10 28 10) Which of the following is the £135} paramagnetic in atomic form? He Zn Mg ' Fe [\l 11) Which set of elements is 9,9; in order of increasing atomic raalius (smallgst’ one first, etc)? K+, 52-, 5&— F, o, 02- Ca2+, K+, 52— Na“, F", F Fe3+, Fe2+, Fe 12) Arrange the following in order of increasing ionization energy (lowest IE first, etc). Li,(1E1) Na,(1E1) Li. (1132) 364152) A B C D B<A<C<D A<B<C<D B<C<B<D B<A<D<C A<B<D<C A-3 Fall 2006 Exam IV Morlino 13) Which of the following species would have the greatest attraction to a magnetic field? F92“ ‘ h I 02. re3+ Fe Fe2+ 14) Which anion would have the following electron configuration? __._._- 152 252 2p6 3s2 3p6 Ca2+ 02- S 12.. C1- 15) Metallic character across a row from left to right and down a column of the Periodic Table. increases; decreases increases; increases decreases; decreases decreases; increases 7 none of these is correct 16) Which of the following has the smallest (lea st negative) electron affinity? ’ Ge U) 17) What is the major factor driving the formation of NaBr (s) from Na (5) and Brg (g)? The attraction of a single positive Na ion for a single negative Brion. The low ionization energy of the sodium atom. The favorable lattice energy for N aBr. The low heat of sublimation for sodium atoms. The high electron affinity of bromine atoms Fall 2006 Exam IV Morlino 18) Which of the following can be negative? IE1 ~ap cocoons (+5 lEA} ‘—>L.LSU.G.\‘LL1 L“) bw+ Can be IE2 ——-!- dwws (1+) EAZ -—7 chufs G") I none of these 19) Which of the following is the correct Lewis symbol for an atom of oxygen? A) X10" B) 30 .. CD ova :0: C) D) 20) Strictly speaking, ionization energies and electron affinities are internal energy changes. enthalpy changes. both internal energy changes and enthalpy changes. It depends on if there is a volume change. none of these is correct. A'E Fa112006 Exam IV Morlino 21) Which of the following would have the largest (most negative) lattice energy? ng 5‘ lame/5+ mfihlwe dwapckas 3L smallest ions $63M" 13mm (+276 q_6 ClMgIQ “W I“ tapafier' Wm F" \ecé‘u‘rgz D) NaF E) KBr 22) A compound is found to form between As and Br. What is the most likely formula for this compound? A)AszBr [453+ [Ala 452. 3.3‘0 finer-i pair) (.360 n B) AsgBrg 36 H cl '3 @sBrg E) r L K ('j D) As3Br Asyr g r“ A SEX-8 E) AsBr 23) Are electron affinity and electronegativity the same thing? Yes, they both correspond to an atom's or ion's desire to have an electron. No, electron affinity corresponds to the desire of a gas state species to take electrons whereas electronegativity corresponds to the desire of a solid state species to take electrons Yes, both electron affinity and electronegativity increase as you go across a row and up a column in the Periodic Table. . Yes, they can be the same in certain situations. 'none of these is correct 24) How many covalent bonds does oxygen tend to form? A)3 - r\ -' #3: Lin aired E,— : #Qoualen‘l’ bands 0 B)1 _O' P C)6 .. ql§ @2 BM 25) Which equation corresponds to the lattice energy for lithium fluoride? '— —-'--« A)2Li (5) + F2 (g) a 2LiF(s) ' f\ 66 ‘° B)Li+<g)+1=~ (gw Ling) °\.5 ©Li+ (g) + F- (g) ~> LiF (s) \ac/W D) Li (s) + élfi (g) n» LiF(s) E) Li+ (aq) + F“ (aq) A» UP (5) A—6 Fall 2006 Exam IV Morlino Bonus 26) Which of the following distances is closest to the actual atomic radius of an element? 100 pm 1 mm 1 cm I ’ 10 nm 1pm 27) The enthalpy of formation (AHf) of rubidium chloride is —430.5 kjlmol. The enthalpy of sublimation for rubidium is 86 kllmol, and the first ionization energy of rubidium is 402 kI/mol. The bond dissodation energy of C12(g) is 243 kJ/mol, and the electron affinity of Chlon'ne is —349 kJ/mol. Calculate the lattice energy of RbCl sea/‘0“ (s),i_nk]/mol. 0-15 A) —170 pp) B) —260.5 + ‘ :' : ROW (3-8125 Rb (,8 ~—~r Rb (as) + le A H l “691 c 2 2431<VWJ E)+260.5 12:63 luau fl .2 CA a? A H ‘ BEG-L ) CAGES + la" ‘-+ Cl??? P\\D+ + C\75”—V REC/\Cs) AHMMJLQ. 2? REES) ‘\" ‘1CL\7_CEB-—> ébucs) Aug: #430.5 2.4SkJ/mold “430. 5 kJ/mol = 8L9 M/mol + 402K3/mol + T : /mc>l RED (5) "‘37 (K: AH AH: EA. 2 “347 k$/mo| A H mill-Ice : A-7 ...
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This note was uploaded on 04/07/2008 for the course CH 101 taught by Professor Morlino during the Fall '07 term at University of the Sciences in Philadelphia.

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Practice Exam B - Fall 2006 Exam 1V Morlino There are 25...

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