CHMoctober2004 midterm

CHMoctober2004 midterm - Name: . Student Please Print...

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Unformatted text preview: Name: . Student Please Print Clearly /' . ' CHM 140V >5 l?» A: . Mid-Term Test, 1 Hour October 25, 2004 Answer all 4 questions. Please write in pen. The only aids allowed are non-programmable calculators. 1. a. Fill in the symbols for the first 36 elements in the table below. Explain the rationale for the unusual shape of this Periodic Table. fiat +9 Tit“ Him”? Adm! 1“»? Manny; :WM (dwell-L “fa-late. {a rkczt W‘“ m" ,‘Pt's‘fli-‘P‘d an“ ., fl __ , Lewes rowel; +3 ,1” [Lilli-«fl number; whoa: 1AM «silt-Ni *7”; YC‘IVWI “M [4 any ‘ m , V uh .1 [Hiya Mal-fin ft Gag-(grind)? VM 8‘“ tray» Cm‘fij firm)“ hull/ram k‘t‘sll‘rl'e «MA red. I one b. Balance the following redox reaction Which occurs in aqueous base. 2. EU G457: -l a ' I ‘l r]3 + Cl2 # ((231'04'2 + 104" + Cl' «'6; *, 5:4(2361; —a aux-)2“ +3¢GH' +320H' if tango; Crl'5 --" Crag" fl):ch- 9' 34hr “7 ,5 (320:? +c(;['3 fl Cragz *31‘09’ 1" islet) +Z-?e')2. a; 6‘40H' :- Zr' 7' + ' 2." 0 “it ' " J1”; 2—? €173 ‘—-° 5 ’ L'r 'f‘érfl'? f‘ Bthtu T91“ CG 0 co lw-tlm‘dl ruler (haflfiq’a d‘j 2. a. A 5.048g sample of a mixture of NaCl and BaCl2 was dissolved in water and then I9 reacted with an excess of an aqueous solution of NaZSO4. The white precipitate that formed was separated by filtration, dried and weighed and was found to have a mass of 3.293g. What was the mass percentage of each compound in the original mixture? Atomic Masses (g/mol): O=16.00, Na:22.99, 3:32.07, Cl=35.45, Ba=13733 1%} 9.11:.) K/Jmti Fli’nfbcgz 4]- Measdf --3’ gL’C'QG] {- W'vf‘r “Vi *509—2' 37 2‘73.’ .. nag : J : 0.3iri1m‘4} _ éf‘ } {Le mud?»wa (“e/e3 “its/wt *— ,. SJ; “WWW ' lg: ovate-H Mg ’7- O‘w : Cs H‘s, , m 3r ’(l 1' g_(2c2s.~aa) 5204755: _: g _ Y (5 “5m; 4 (u uewrmeMans mg?) 3W3“ X59 H W ‘7 W ‘+ 2 ‘ffi‘afi ‘“ -Eirflg __. K seesaw”? X3 Clinch) ’Mf/w -— J . r 4 - . ‘ ;03610=‘o€ S‘Et'rfiflc‘ » HvM/j -. ‘ - 21., (, MICE / “filial o g-Ugfigg' 5.0%; ’ 2 41.8% My“, 0:: .> 5&2], Daub. a. Nmz A r A ' ‘— "“LJC‘L, b. A sample ofpure urea was analyzed and found to contain 1.121;; N, 0.]6lg H, 0.480g C and 0.6405; 0. The molecular mass of meet is approximately 60g/mol. What is the molecular formula of urea? Approximate Atomic Masses (g/mol): H=l, Can, N514, 0=16 M: Lilli: .. 0N I ('2er c 9.1:) 1-{Z.xf29f(lx16) fl NKEQQV La" 5701’ «4 sin, [.3 H? NZ (5 3. a. Consider the following ionization energies, all in kJ/mol, for an unknown element, X: 1t= 580, I2 = 1,815, I3 = 2,740 and I4 =11,600. (i) To what group of the Periodic Table does X most likely belong? Briefly explain. ‘1 1'"? . flag Frrsi- Fanfaqh'za é-W‘j/t “IQ-Huig j “W” a 5mm in 2‘” we" W 7% "We: Sashes“ M e. Vol-4:179» MMU'N) -”~ ‘xwflg Eluflw» 2% "6'7" Mk (cmng i ’ “' (ii) Account for the increasing trend in the values. “'1‘ "M-‘e Male/m. weirm '2de 5% Clo agi- +u fie ‘42 keel: r‘ mucix,u-; _ WM, Mm; wan/us fMUi‘} ,Meéd w a 1 (iii) What is responsible for the large increase between I3 and I4 ? Th?€ieo‘ifl¢w~ h Q’. (EMU-€41 £N- «Rem. '1”; w» d.’-’1 IM, L, (a. (1‘3 w'n‘ LLW'AQ' PE Mfm' malt/“'5 l (4"- TQ- 2‘71 6169591.. ‘Wwai mafia (iv) Which of the 4 ions of X will have the greatest electron affinity? Briefly . explain. - I \ b. (i) The ionization energy of gold is 890.1 kJ/mol. Is light that has a wavelength of 225 nm capable of ionizing a gold atom in the gas phase? “'5 5 31V ' i117 h=6.62x10’3"Js c=3.00x10"m/s N=6.02x1023atoms/mol O: 51.6- __ w 14/: gem; rm“ h...»— ' K. K U9 0' _ c7 5- 63.: ((01% .. ‘5 ' .__‘ f ‘ ._ ' . ('4' K I : (engage Ishsmsghvif- of. 7v K10" I93. x2 a; > a, Z-Ehnflm .5.— q.— I ‘ A ‘ r. _ z I, filliesfo T > gusset-m» " J VIM z,in Xixfia‘h , /" (ii) Gold is in Row 6 and Group 1 1 of the Periodic Table. Write its complete orbital electron configuration, Le. 13“, 252 .4 r; '/:.-."Fir/L€ C49“ "’0' Fr» 0J6? - If: 25"“ 2,»*-' 331 3ft: 4s" m” we 51:2 Mmspé 5,1» 9;”5‘f fl 9. -IL *’ sv2, Draw the Lewis type, resonance structures for the ion, (OCN) . Assign formal charges to the atoms. When a proton, HZ binds to this ion, to which atom is the H most likely bound? ,_ 1 flags 4. a. O :Chuucg/V:e%>jj=ggy Cl ‘ .IF - . k . ' .1 T13 Te: "C i9 7L“ Walflé+lgrp~§£{.w I b. Two molecules exist with the formula Nng. Their structures are /‘F.: :F F: u\N=N/u I! ,, N=N md SE/ 0! (i) What do you expect the NNF bond angles to be in the two molecules? Explain. dreamt HOV ) “aimed” ) m grace-W, .., a- M; a, m 4M x w! rs l— _ at F r‘ r&.-7L624,epfih’€) 'f'has' CP¢cgt£t mtg” 5fd-CL hafwe (’12 mm?“ hark“; we re F (ii) ‘ Will either of these molecules have a net dipole moment? If not, why not? If so, draw the net dipole moment vector. 71a 5% w.” ~ M. Ma ' It)“:fo 61"!"an A : NW vict- ioa Jig-Jim. x _/= @> 3F ...
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