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R_669349_2010-01-07 - CH E I O PAGE1 — CHE 1073 MI 0 Q...

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Unformatted text preview: CH E I O PAGE1 — CHE 1073 ( MI? 0 Q TEST III { DR. POWELL APRIL 13, 2006 Please print your name on both the test paper and the Scan Tron form. SECTION 1. MULTIPLE SHOICE (4 points each). ft is " 1“ fl 1:; r a 1. The reaction BaCI2 + (NH4)2003 —> BaCO3 + 2 NH4Cl is an example of a) combination single displacement decomposition d) precipitation e) acid-base neutralization 2. The reaction 2 Al + 3 Br2 —-> 2AlBr3 is an example of combination ,, single displacement ,,c) decomposition d) double displacement 3. When the equation Al(OH)3 +: H2804 —> /Al2(SO4)3 gHZO is balanced the sum of the coefficients will be ' a) 9 b) 10 c) 11 g) 12 f) 13 4. A nonmetal is reacted with oxygen. The resulting compound is placed in water. What class of compounds results? a) An acid b) Water @ An oxide d) A base e) a salt 5. How many moles of KOH are in 27.5 mL of 0.250 M KOH? a) 0.00431 , b) 0.00688 . c) 0.00724 1;) 0.00813 @ 0.00921. 4.117279" 2'01“ ‘9‘“ :41, PAGE 2 0 / 74561 Li SECTION 2. PROBLEMS (6 points each). Please show all your work if you wish to receive any partial credit. s; .a‘ _ ., 3,0114 . . . 3 o . 7 7 6. Consrder the followrng equation: 1. u, go 3MgCO3 + 2H3PO4 ——> Mg3(PO4)2 + esco2 + 3H20 5,7 H ? Q If 50.0 g of magnesium carbonate reacts completely with excess H3P04, the number of [.005 grams of carbon dioxide produced is . - ~ . 50,0594”? 091%in (ifi>{ WW 3. 33:; _ a 32;: Mace: 2 m: c) 13.1‘ A 48.00 d) 50.0 7'+/3’} 6) 15-7 IKWX [we 3 [‘L’VQLCO} , \ , _ KW 455‘. _ . me’lfl (g 7. What volume of 0.200 M Na2CO3 (FW = 106) solution con alns 33:09 of Na2CO3? . . it: a) 0.200L 53! O 53 0» N C0 .f , y , ._ B}. b) 0.400 L w j A; 3 I, in... y . 4... "\ 5. C) 0500 L . 0,25 3/. 7,753» .-.../—- .14»; R 10:2. ' -' 31/ ] ”A 0 ( /l ‘0” ' \ 3'5. 2.50 L ' 1: , . » -- c g 8. Calculate the molarity of a solution that contains 50.0 g of NaOH in 750.0 m of solution. , . a) 0.600 M 50- m 2‘: .9 9.31;: W o L - b) 0.800M ijwf’: _ / * f ,1 f“ /,é7fl/], C) 1.07M ' J, \-~ ' ., .: J- a) 0.040 L :3 , ‘ £1.60L W , OrzoO/Vl/Ustzw3 b) 0.080L ’ . c 4.0mL P, , 3 ~ l/L'o/Notlir / L 8.0mL 3. 'J'+ Mo? m x .1 m.— X e) 16 mL ar 7935 h D' d K J :7 39 fin. IL/ cu. lwa' 2.0x" -,/————f~:?“x o'Bl‘ fix 6,1322%» ”'4 ‘ 10. Aluminum reacts with bromine to form aluminum bromide: 2 Al + 3 Brz —-> 2AlBr3 If 25.0 g of Al and 100. g of Br2 are reacted, and 64.2 g of AlBr3 is recovered, what is the percent yield for the reaction? ' . 2 ' -Li VIK- 204(6r1 .’.7?"7é ég'rjtéfi A / :93? a) 14.6% 2 53 Al (4—5:~ /‘Z."I:"}_’*i («7,3, 3 ~_— » j, b 44.2% \Qé, 1C: " ‘ J \_ ;-_._, r“ /, r3. 57.7% , , ’7 , . ,5 ., ‘ — ‘ ‘1 ‘ . .1 I?!) d) 37.1 % /0 Or, 1gp; /-J/’::3m (- ,.-' :__r” L;:::_ /, 3 : [Ll ‘. Cf: €37}, e) 26.0% ’ ”7’ng 3 M’ I“ f; " M” 3 H0 a» 11. 12. J20 PAGE 3 Ethylene, C2H4, is combusted according to the following equation: CzH4 + 302 '_) ZCOZ + 2H20 How many moles of C02 can be produced by the reaction of 0.480 mol of C2H4 1. 0 mol of o ? W /' CO ' r“ r 0.240 moi A4489 Ml CZ HQ 812.4.) : 0,180 m/ 602 0.960 mol 1 / [Mal 02m. 0) 0.720 moi / _ _‘ d) 0.864 moi I _’ g; .1 e) 0.450 mol / 1 .ngl/la1gjj .23.er tgé‘wfi 3:21.- 3/ OL- Given the equation: BaCl2(aq) + K2Cr04(aq) -—> BaCrO4(s) + 2 KCl(aq) calculate the number of grams of BaCrO4 that can be obtained from 100.0 mL of 0.300 M BaClz. 100m11%,300M0/Wr, $3 3 3 7 596/ r f a) 7.609 "1191:9111 1 U 263,33 11”“01196119“ (9 6.169 2373 3 c) 6.049 {2-9 3 d) 8.91 g 203..) i’ 9) 4.829 1,. ;.. 7 , ANSWER THE FOLLOWING QUESTIONS ON THE TEST PAPER The following reaction produces 76.0% yield of MgCO3. MgCl2(aq) + Na2C03(aq) —-> 2NaCl(aq) + MgC03(s) What mass of MgCO3(s) is recovered from the reaction of 1559 of MgClz with an excess of Na2C03? (10 points) {557M101 HMO/m CL; 01/44 C0 >gqlggz m ,7 Z<~———_L_~ qJ/l 217/144CZD iWyC/Zfln3\>\_——Kf’ Calculate the grams of solute in 18.00 mL of 0.800 M Na2C204(aq). (8 points) 1 '9 LL " ,— r g, I600L 0 8596M .K.o=.662-/1;;o;0~. / * /, *‘\‘7———————-—\A [We/ix ’ PAGE 4 3. Complete and balance the following equations and classify them as either combination, decomposition, single or double displacement. Where no reaction will occur, write "no reactIon" as the product. (4 nts each , 6/ U) + awe/7m? CD 8) Clzig) +}NaBr(aq) —> r- at All + 3 COA A5533 b) Al‘iCOJ/2 ——> CQQUO33L “(Ll/4L O 4. 10.0 g of MgCl2 and 10.0 g of NaZCO3 are reacted according to the following equation: MgCI2 + Nazco3 —> 2NaCl + Mgco3 a) How many 9 of MgC03 is produced? (5 points) 3 ijj C 03l\j/' b) How many 9 of the excess reagent remains? (5 points ____H__. a. 7/ r” .‘ li‘g‘o‘lfifl (:34/1:C‘Q/" [3“) O ,. ..l H X :1 ’1‘- '1 5 Lil—\_\_ .'/—— L;- m :l} : I I .’ I 9; J “I 615,9:3 timol Moirjgrl); 5’/5/”‘)§ _.__-._.__.—~'— -—-—- r "I’ L [III-33"! CO I ‘ g f, ‘7 . f If I \‘I' /2 if»! I)! )4/3 (07 \\ Z “Z )ga/’1zcjf\\oz\ D .x a _.___—-—-—— I h “‘1 . . ’ : fl ,3: 0: 1k) J. CO:\\1/Oé 0/ /} ~( (WOI NRICOB/ lmm’ m; f {)3 /) J! \‘i‘. 1’. ! r If” l, x ‘ 3/ f“ _/ ’4 if“ f], xjmolu, 597/ Lav/”mew __"/{ (IN/w. 7w; "’ [Ii \‘ “""d "“""‘ _ ”0509 Mafia /0[9 6] l . 0' £771; i. 3': M ' . , WI”? /} v'ix' ...
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