1B-Quiz-3-S10-key3341

1B-Quiz-3-S10-key3341 - Quiz 3 Name: 1 /% 1+“ 2 Chem 1B,...

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Unformatted text preview: Quiz 3 Name: 1 /% 1+“ 2 Chem 1B, Spring 10 Fossum HC2H302 Ka= 1.8 x 10'5 Always show your work and explain your reasoning, include units, and check significant figures. 1. (4 points) C(s) + 2 C12 (g) S CCl4(g) AH = — 106.7 kJ Assume you start with a mixture of the above substances that is already at equilibrium. For each of the following changes, state which way the equilibrium will shift and explain why. What will happen to the partial pressure of CC14 in each case? , ‘0 a. Decrease the pressure got , wi’ ( ( Shift- 17) mar: WES O 3613/ h) {wreak W prSSWT. “lb P604 will Qua/cage, b. Increase the temperature 84‘ W1“ Sufi} in ~+M fin/K. CQtYfCiW'm, which (S rgwge m “H45 (62%, 3%th 1‘0 PCLM JLflCt‘CaSé , use 2. (3 points) a. Label each substance in the following equation as either an acid or a base. H2PO42' + st03 s H3PO4 + H803- B A A E b. The overall KC value for the above reaction is less than one. Which is t e stronger of the two acids? Explain your reasoning. k 4 ‘ macmwf kmd “€8wa @fl- A WW-WHS‘i—Ef reacbovx aqvthlofl‘wm atwajs hes “toward 4% you (Mil/ta +96 Wand. fikefimfigwxdisflwmwwdwryfl~vFRR% 3. (5 points) Calculate the pH of a 0.23 M HC2H302 solution. Mongol + H70 2—2 1330+ Margo; \ 0.23M to“ Q5 @ c “K W“ . 4X - l23 *‘ x : .23 Kit 84 O x /7 x 0 Y 33 A: fugoiltczngoj _ i}, [.SXIO’S ‘; X: 203 Marci .v..—.—:mw»w:--yv “‘”""“‘" l _ (Z _ X 3“ {RC—N303 0 5 2 as PH:2‘>9> X 3 {$40 / M, M : 0 25 : 12729 $0 0”“ 0.23 W“ to I we"; “3”” ((431152 4. (8 points) 3 Ag) + 2 B(g) r. 2 C(g, + mg) Kp=5.5 x10'9 If you start with a mixture of 0.500 atm C and 0.300 atm D, calculate the partial pressures of all substances once the system reaches equilibrium. Willi MW ta WLLfiW " IX L46 wad of M g X OIS‘OO—ZK 01%) “X New“ 2%) Haw 05¢ _ HHC Wot C s‘o CisLfl~ 0.39 1 mill 8LT ugcok UP. (“ES-wax To ><= 031013: 0.235% OlSYDO '= 2x 2 3x: 0350 am 2x = 0.3730 04w 0 0.300-x = comm . #3 26. + ‘D ' l 659% mm 0500 m $ 0.030 0W“ a 1; bag . Ch 23. . + Q ~— 33 ’73 +23 4 . r , ,, ., , _ V f; K (S Swat e1 0745043 0.800 ~23 23 ‘ j '2 ,p m» 0+ ‘ \Zp : PC PD ¢ (233 (0030*33 : 55 >40 ‘ M511 3 {son a 2 ' ewe-W"— ‘2 . * mom PA PE (0950’ Jszoij) l” “"3" “U M? 4V» 4 70.0300 #wf—Mw “ j: (0 952910 Koo) //©A : OHS?) CClW‘ : _ cdvm a l _ : M a, x pa , 23 l lx to \ PD : CLOSDCClV‘fl / ...
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1B-Quiz-3-S10-key3341 - Quiz 3 Name: 1 /% 1+“ 2 Chem 1B,...

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