EXAM 2 Key - 1 Solid sodium chromate(Na20r04 161.97 g/mol...

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Unformatted text preview: 1. Solid sodium chromate (Na20r04, 161.97 g/mol) is added to a 75.0 mL of a 0.100 M silver nitrate4/ solution (AgN03). Solid silver chromate is produced. a) Write the balanced chemical reaction for this reaction? Be sure to include states. NQZCr04 (5) + 243 M02“: 431 CF09 (3) 4r 2 IVs/V03 (48 b) What mass (g) of sodium chromate is required to precipitate all the silver ions? (9.0750L X 0100 m/ It 4/0 lm/ Nazéroz, ‘ [5/ 77 4/ do ____3,- Y P_’____.,__..—~ ' 4 r 9 1/ 1“” Ail/”:5 x “—737; 2. Give the maximum number of electrons in a neutral atom that can have these quantum numbers a.n=’4,ms=+‘/2 {’6 [6 b. n = 2, [=2 / “$79435 amt [WM/i c. n=5,l=4,’m,=—3 Z d. How many valence electrons in P? 5 e. Write the electron configuration for phosphorous using the noble gas notation. [4/2.] 3513f3 f. Provide the symbol for a neutral atom or ion:7at isoelectronic to P. / +l _“ Asymé {WM folks/[SJ 5 5‘ l l5: 3. The first four ionization energies for the elements X and Y are shown below. Propose the identity of the elements and justify your answer. There may be more that one correct answer so explain completely. (there is no need to use a table out of the book for this answer, just look at the trends). ' X Y First ’ ‘ 170 ' 200 Second 350 400 Third 1800 3500 Fourth 2500 5000 JUMP {A 153 Malia/E group 2 \/.‘$ dew/e X 44 per—Md“, #fiéfé beau/5+: IE, ForX <15; Far y r 502 X @013 ‘i/ owl Varraua afiz/mr 4154/64’6 4. The Large Hadron Collider is a particle accelerator and collider located near Geneva Switzerland. They accelerate protons to just below the speed of light. The mass of a proton1.67262 x 10’27 kg. What is the de Broglie wavelength, in units of nanometers, for a proton traveling at 2.9977 X 108 m/s? ,\v A , é-éZéX [U'SQJ-S . ,04/ML ’_[,7262x/0~27 k3 ,Qflqfi ”02% in 23 L32! WU ‘614 5. The work function of an element is the energy required to remove an electron from the surfac4' of a solid element. The work function of lithium is 279.7 kJ/mol. What is the maximum wavelength of light capable of emitting electrons with a kinetic energy of 255 kJ/mol. (If you need it, the mass of an electron is 9.1094 x 10'28 kg). PM“) m/ %/ 75/ 5 , l ' - ' 39 71% y m/ 23 : 3.877 M0 22% m 5.022x/o Mp4“! film/a4 - . . 21237 W“? /\, 3L:— - A C y HQ ‘1 , m : 2% .: 49-7 1’ $3577 1/022 AJ IOU "1 6. When 10.0 g of acetylene (CZHZ) and 10.0 g of oxygen (02) is ignited, the reaction produg 002 and H20 ' ‘ a. Balance the combustion reaction. ZC?HZ_ + 501 ———? z/COZ * 2H10 b. Assuming the reaction goes to completion, what mass of C2H2, Oz, 002 and H20 are present after the reaction is complete? (write your answers in the space provided, show all your work). é‘g ngHz $2 g02 V ”.0 gCOz 2.g5 gHZO (m3 €2sz lm/ €sz y 4M” 5% V 49.01 (01: 336/ 26093 L1HZ Zw/‘ZHZ T517j j [(9-0 O - j Z— » [Mo/‘02. (Incl (0 wy‘AL" (”'0’ “7— : 1/7} f ”003% s w 04, ‘72?“ :ll LR . ./l /( an/ H 5 I “A; ,g W; 2.25:? 6 ”10/ 07. [My] .a;~ USMJ +Ae IN ,; (“saw/W My (”“66 (For vaer ”ll/“had, 6M “IL/4Q ofiur kg!) [3.253 Produce! —- [0.0 01 0530/ a 3.253 CZ H7, (ajaaa/ v.03 CEHZ " 325 CMfi-UMLJ 6'553 ramming 7. In your reactions of copper lab, you treated aqueous copper with excess concentrated nitric acid. If you started with 0.750 g of solid copper and 10.0 mL of concentrated nitric acid (16.0 M), what will be the resultant concentration of copper(ll) nitrate? Assume there is no change in volume. _ CU(5) + 4 HNO3(aq) '9 CU(N03)2 (s) + 2N02 (aq) 4-2—1200) 0,7503 [U X {My} CU x’ [MO/ CUZK/U3)Z { I : 53.553 (U l/tw/ (a nomad; Extra credit 8 pts: A watt (W) is a derived SI unit of power, the measure of energy per unit time: 1 W = 1 J/s. The National Ignition Facility (NIF), one of the world’s largest and most powerful laser systems will produce 500 Terrawatts (5.0 x 1014 Watts) of power in its 2.0 nanosecond pulse. How many photons ultraviolet light of 351 nm will be produced? 1. Solid potassium iodide (Kl, 168.00 g/mol) is added to a 35.0 mL of a 0.250 M aqueous lead(ll) nitrate solution (Pb(N03)2). Solid |ead(ll) iodide is produced. a) Write the balanced chemical reaction for this reaction? Be sure to include states. b) What mass (9) of potassium iodide is required to precipitate all the lead(ll) ions? 1/ 0.0350 L x 0,250/140/ Dag/0331 Zmo/ kl X 1535‘ng kg: 11/ l m/ fled/03k ,MO/ fl 2. Give the maximum number of electrons in a neutral atom that can have these quantum numbers a.n=5, 501’ )2,er 25 b.n=2,l=‘1,ms=+‘/2 3 c. n=5,l=5,m,=—3,ms=+‘/2 g d. How many valence electrons in Br? 7 e. Write the electron configuration for the bromide ion using the noble gas notation. [Ar] 452 36/” 4;)6 f. Provide the symbol for a neutral atom or ion that isoelectronic to Br". 3M (he. kr/fiajd/ {1’63 64424) b 3. The first tour ionization energies for the elements X and Y are shown below. Propose the identity of the elements and justify your answer, There may be more that one correct answer so explain completely. (there is no need to use a table out of the book for this answer, just explain using the periodic trends). x Y First 800 , - 600 Second 2400 1800 Third 3600 2800 Fourth 25000 12000 [3'3 ju/"P OCCurj («/ng ' del \/ m {4 q ji’oulo M/ . 3E/ [60mm firadla) V 11:, ForX> If, {cry 50 X [5 qéai/e Y M Wide/2C9» 4. The Large Hadron Collider is a particle accelerator and collider located near‘Geneva Switzerland. They accelerate lead ions to just below the speed of light The mass of a lead ion is 3. 44071 x 10 25 kg. What IS the de Broglie wavelength, in units of nanometers tor a lead ion traveling at 2. 997924 x 108 m/s? to?“ NH LII—My? 5. The work function of an element is the energy required to remove an electron from the $1er of a solid element. The work function of magnesium is 355.3 kJ/mol. What is the maximum wavelength of light capable of emitting electrons with a kinetic energy of 95.1 kJ/mol. (If you need it, the mass of an electron is 9.1094 X 10'28 kg). 6. When 10.0 g of butane (C4H1o) and 10.0 g of oxygen (02) is ignited, the reaction producesfib and H20. a. Balance the combustion reaction. Z Lilli“) ”301*? <5 :02 +10 H20 I b. Assuming the reaction goes to completion, what mass .of £51502, 002 and H20 are present after the reaction is complete? (write your answers in the space provided, show all your work). ' 7/; g C4H10 . g g 02 thb 9 C02 4. 33 9 H20 [O‘Oj (‘4 H10 k [Maj 8%] c0 -. I y ”as. x M 0 50¢ : 50.3 (0 53-12:] 2 Mo] 69H“) .. [Ma/ ' j Z. “—x.‘ 4 0 Mo 1 o ’ 3% W 34:. x 44-01320 cw 502??er 7\ 32.003 0-1 13 “0/01 « [Ma/ LR 37.003 ‘3 ”“1 0: [M] j IOIO O Y [no] . 2010/ CQHIZX 65$.IZ Cnga 3 Z 32.00j K lgmj 02— 7’1‘—‘ 3 217?:[FMSMC/ \P'~‘ —,__ W :4th, 10.0J - 2.773 :/7, Z] 7. ln your reactions of copper lab, you treated aqueous copper with excess concentrated nitric 3 acid. It you started with 1.8620 g of solid copper and 25.0 mL of concentrated nitric acid (16. M), what will be the resultant concentration of copper(ll) nitrate? Assume there is no change in volume. cw.) + 4 HNOg(aq) —> CU(N03)2 (s) + 2No2 my 42420“) l,%620 C) x [Mo/ y [440/ C” (”03%, I j W... 63.5% Cu _ [ Mg] Ca 0-02501. \l & Extra credit 8 pts: A watt (W) is a derived SI unit of‘ power, the measure of energy per unit time: 1 W = 1 J/s. The prospect of using lasers as weapons has emerged with the advent of a mobile laser that can produce 20.0 megawatts of power for the full duration of a 6.6 second long pulse. The laser operates at a wavelength of 2.8 pm. How many photons will be produced during the 6.6 second long pulse? ZOO xlUéQ/ . 6-65 11:L -r Z.€£xIO M ...
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