C112H F09 T3 - [X] [Y] [mom 0.2 ' 0.2 '31 zafifizq 0.4...

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Unformatted text preview: [X] [Y] [mom 0.2 ' 0.2 '31 zafifizq 0.4 0.2 29:5504 0.2 0.4 2":3%5= ‘i’ééjoz 0.2 0.2 0.2 identical). as 717; , .643 ., .939. Me To; ‘* 512%“ .25 g _ M(Zl(ll"afl " mt JL_ lHlU‘SKIU‘) id l’l l.ThereactionX+ Y + Z -) left biank. (cone in M) in the four empty boxes below [Z] 0.2 0.2 0.2 0.4 0.2 <3 P is known to follow the rate law: dfP]/dt = k [X] 1 [Y] 2 [Z] 3 [P] " . Shown below are concentration data and initial rate for one experiment. Fill in the expected rate data for the four experiments where it is [P] 0.2 0.2 0.2 0.2 0.4 initial rate Mfs 32,000 EMU [1m 2. Suppose that a catalyst lowers the activation barrier of a reaction from 125 lemol to 75 kJ/mol. By what factor would you expect the rate constant to increase by at 25 °C (assume that the frequency factors for the catalyzed and uncatalyzed reactions are the _ -i ’3 3. The halfiife for decay of carbon-14 is 5730 years. A11 object contains 0.250 grams carbon-14. The limit of detection of carbon-14 is 2 x 10'10 grams, how long wiil it take until there is no detectable amount of carbon-I4 in the object. = .ooollflqu" ._ ZMW/H 1160120441 yr" : Will? Heath” mm memos” Twill V1 armwzmmw Ammo: 4. The reaction shown below has a forward rate constant In at 298 K of 640 s'1 ; a reverse rate constant k1 at 298 K of 1370 s'l. The activation energy for the forward reaction is + 23,200 lime] and a value of AE" as AH° for the reaction is + 7,600 meole. k1 O=N=O + $0 ame N50 + c=o 1"! a. Calculate the activation energy for the reverse reaction ( Ea for 1L1 )at 298 K AB! 5 91am ' gamma 7% all!“ 5 ' Hirame — (7000-25200)an : Em” 3a. Sign, units. h. (fi'alculateéhe value e forward rate constaIBt k1 at 398 K - a L .1, w: ' ' Tlh” Tn 214;]; 6 3b. Sign, units. 9995' , 432%: '_,..L] "L .an " - Ml a ' “yawn (at at T 69739.] 3" Will}: (-msutllefifl—fl m; m: K ml‘fiJ]: M25397 0. Calculate the equilibrium constant Keq for the reaction at 298 K. __ ELI}! H I : u VIE? " WE! " I370!" * AC 0 Z w fimte the values of AG”. and 15°13; 33: 1'13':ttyt;“:ti(-11:15:C l1.298 K. 3d. Sign units- :(—E?)Jlmvtllltlllfil(lnl%lll lmgj pM%fll‘lmiA§° AG°= lllZS %" .: Wigwam“.tllninluzl 57.7%.. : (74! .. o_ a, AS * (‘qu All-n 2 [WE Vim Mlllalllm-Hilil“ 5. The half—life for decay of a certain radioisotope is 8 seconds and it obeys first order kinetics independent of temperature or environment A person accidentally breathes in 8 x 1020 atoms of this isotope. a What is the first order rate constant for decay of this isotope? it * it? 1 ‘ a - Join _ .afl’) _ - “It "355 - ‘93" ' .0547th b. How many atoms of the isotope will be present 400 seconds after initial ingestion of was a” toms? In ( rim " “1* original u fiat mm“ J or fill it w” atom: ? 10’ “ahml‘ (Mm Ig' _ __ x Y: CM”: t” " 5W1” ' 7W : l. rm x! is 1 6. The activation energy for release of 02 from the HemeglohinFe-Oz complex is 60 kJ/mol and its rate constant at 300 K is 20 s'l. at what temperature will its rate constant for iSOETrizati ‘ ’ £73 litT‘. Y1 m ' P1 Ti Tu ml ) 5b. Include sign,units “SW. 083 6. Include sign Let" 205" ,L 300 J iOUOSLWz (A: finggg ELIUHKITBQVJ : zoom/t, 'MLIMIHM] : 930W] 7. For a third order reaction occuxring in solution the rate constant will have what units (M = concentration = molarity = moles/liter) (circle one answer only) Hes-HI )Iysfif_ M2 s'1 ' )[Vs-l M1" 3’ r” -- germ l/M‘l/ M s" M?" W #31,, (ngI ' {/ML 51 KM: 51 G M4 31 Ext/M5351 VI: J(I m—Z “Ml-'31 W51 M"3 s1 \ sf' M'5 s1 V“ H«H—> H'rH' H‘m-rMHvCH U‘ “3+ J} 8. Reaction of H2 and Cl; occurs by a radical chain reaction. In the space below write a balanced chemical reaction for a termination step in this reaction 10. For an elementary reaction step a plot of 1/ [A] versus time gives a straight line. What is the reaction Order in [A]: (circle one answer only) ‘ 4-3/"[email protected]' 11. For an elementary reaction step a plot of [A] versus time gives a straight line. What is the reaction order in [A]: (circle one answer only) 12. For an elementary reaction step a plot of In [A] versus time gives a straight line. What is the reaction order in [A]: (circle one answer only) mm) 4-3-2633)[email protected] NOTE: There are two bonus questions this week, but you may answer only one of them so choose between this one and the one on the next page—ofierflnishing exam. Bonus Question: (this is worth only 3 points and it is bonus credit. Do not work on it until you have finished and checked your work on the rest of the exam). In the text on page 593 the reaction between K(g) and Br2(g) is discussed. It is stated that for most reactions the orientation factor has a maximum value of 1 but that for this reaction the orientation factor is p = 4.8. It explains this in terms of what is called the “harpoon” mechanism. In the space below describe what that is, how it works, and how it allows K(g) and Brig) to apparently react as quoted by the book: “In other words, there are more reactions than collisions—the reactants do not have to collide to react”. Bonus Question Answer Bonus Question: (this is worth only 3 points and it is bonus credit. Do not work on it until you have finished and checked your work on the rest of the exam). In class we discussed Zeno’s paradox about Achilles catching a rabbit (actually according to Wikipedia it is a turtle). The assumption was made that both Achilles and the rabbit were points. Like many assumptions this is useful in some cases but must be abandoned in others. One point was that to never forget the assumptions made in solving a problem. In the space below give an example of any other scientific theory in which assumptions are made which are useful under some conditions but which lead to wrong conclusions Bonus Quwtion Answer ‘3 ll Wall MW} llllrl lllllll lwll mllllll “l him will llllllllrl] llll llll mllh'nll m lllelllll‘rll Wl il' . (ller lellll will. elm WW lemll +llll ll llll lllw lllhl llllll<llllll were nlll llilllllll WW1 ll Jrlll . lllllun llll WV all lllll ll Emilia! illmllll. lll llllllm ' Wall-lily ll lll mllelulll mil +lll; ll lllln lllll ml ll ll] WOW fill (may 0? gall/mill lllldlll ill _ swim in mom ...
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C112H F09 T3 - [X] [Y] [mom 0.2 ' 0.2 '31 zafifizq 0.4...

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