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Quel que soit la maladie, avec de la détermination et de bon conseil on arrive mieux sur le chemin de la guérison. C'est comme avoir un gps et une carte routière, dans les 2 cas vous n'êtes pas ...
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Chemistry 17 Problem Set (1 st LE) Total: Total: 80/80 2nd Sem A 201!"201#
GENERAL INSTRUCTIONS : $%&TE ECESSA%.
'% '% AS$E%S LE*&+L & A SEPA%ATE S,EET '- PAPE%.
S,'$ S'LT&'S $,E
Modifed True or False. $rite T%E i the statement is orret and rite -ALSE i it is inorret and hane the 3nderlined ord/s to orret the statement ( 2 points each; 20 points total ). 1 &n the Calorimet Calorimetry ry E45erimen E45eriment6 t6 an obsered obsered 5ositie 5ositie hane hane in tem5erat tem5erat3re 3re orrel orrelates ates to an e4othermi reation. TRUE 2 &n the deter determina mination tion o the the s5ei s5ei o o a metal metal sam5le6 sam5le6 the mani manit3de t3de o o the hane hane in tem5erat3re inreases hen the s5ei heat o the sam5le dereases. TRUE 9 As e moe moe don don toard toard the the bottom bottom o the Ellin Ellinham ham diar diaram6 am6 the the metals metals beome beome 5roressiely more reatie and their o4ides beome easier to red3e. FALSE, harder ! The e4tra e4tration tion o metalli metalli rom rom ' ' is e4er e4eroni oni at at 900 ;. FALSE # &nreasin &nreasin the tem5erat3 tem5erat3re re inrea inreases ses the rate rate o an elementar elementary y 5roess6 5roess6 hether hether e4othermi or endothermi. < &nreasin &nreasin the amo3nt amo3nt o ater ater in a reation reation essel essel inrease inreasess the rate o the reati reation. on. FALSE, decreases 7 The order order o the reati reation on ith res5e res5ett to a 5arti3lar 5arti3lar reata reatant nt may not be a hole n3mber n3mber al3e. TRUE To test or the the 5resene 5resene o -e -e2=6 ; !-e(C)< as 3sed. FALSE, K 3FeCN!" 8 To > &n basi basi medi3m6 medi3m6 the e?3ilib e?3ilibri3m ri3m is shi shited ted to ao3r ao3r the ormati ormation on o dihro dihromate mate ion. ion. FALSE, acidic 10 &n the iron (&&&) hloride"thio hloride"thioyanate yanate System6 addition addition o -eCl -eCl 9 ill ao3r the ormation o the blood red olored om5le4. TRUE
Cause a#d E$ec%. Predit the e@et o the ondition on the 5arameter: inrease6 derease or no e@et (2 points each; 10 points total) . Condition 1. The manesi3m ribbon 3sed or the Co35led %eations e45eriment as not led. 2.The ribbon as not immediately 5laed inside the dry ie hen it started b3rnin 9.,9 as added to the sol3tion ontainin A= and ,Cl !.,Cl as added to the Co55er"ammonia system #. The onentration o a 2S2'9 3sed as hal the reorded onentration
Parameter Amo3nt o C solid " &ECREASE Amo3nt o ' ormed " INCREASE Amo3nt o hite 5rei5itate NO EFFECT Conentration o BC3(,9)!2= al3lated order ith res5et to thios3late
Mul%i'le Choice( Choose the letter o the best anser rom the ien hoies. (3 points each; 21 points total) . 1. $hih o the olloin statement(s) abo3t an Ellinham Diaram is TRUE)
* + Pae
A. The slo5e is e?3al to ∆S C. The y"intere5t is e?3al to "∆, D. All o the aboe ( I% is a 'lo% o- G a.ai#s% T E. -. 2. $hih o the olloin onrms the o35lin o the deom5osition o arbon dio4ide and the omb3stion o manesi3m C( The -or/a%io# o- a 0lac1 solid A. The intense b3rnin o +. The ormation o a hite solid D. The derease in the amo3nt o dry ie E. -. 9. $hih o the olloin is tr3e i a e dro5s o aid ere added to a hromate sol3tion A. The orane sol3tion t3rns yello. C. The orane sol3tion stays orane. ( The 2ello solu%io# %ur#s ora#.e( D. The yello sol3tion stays yello. E. -. !. &n a !"mL test t3be6 1 ml o 0.1 -e('9)9 and 1.0 ml o A' 9 ere mi4ed. & the res3ltin mi4t3re is to be tested6 hih o the olloin test reaent ill ie a neatie res3lt A. 0.10 ; 9-e(C)< C. ,Cl &( #o#e o- %he a0o4e +. 0.10 ;CS E. -. #. A 7!.8 sam5le o o55er at 1!9.2 FC is added to an ins3lated essel ontainin 1<# ml o lyerol6 C9,8(li?) (s.. G 1.2< /ml)6 at 2!.8 FC and the nal tem5erat3re is 91.1FC . The s5ei heat o o55er is 0.98# H/FC. $hat is the heat a5aity o lyerol in H/molFC *. A. 2!.8 C. ><.! &( *58 +. !7.9 E. -. <. The olloin data as obtained or the onersion o ;"!0 to Ar"!0. Cal3late the Arrheni3s ator or the 5roess. *. 6( T I( 5 9( "5 K( :5 L( 85 7C 5 5 5 5 ! M( 1 . 0.! '. 29 P. !> I. #> *; 8 0 00 s! %. A. 1.001 C. 1.0<7 4 1012 &( <(5 = *5*> +. 9.><9 E. 7. A seond reation is !7.0J om5lete in 27.0 mins. ,o lon o3ld it taKe or the reation to be 8#.0J om5lete -. C( *:3 /i# A. 2! min +. 80.7 min D. 20! min E. -. ?ro0le/ Sol4i#.. Sho om5lete sol3tions and bo4 the nal anser in anserin eah 5roblem (29 points total) . *. ,. (7 points ) 1. A metal sam5le eihin <8.9820 as heated to >>.00C6 then ?3iKly transerred into a Styrooam alorimeter ontainin <2.##1# o distilled ater at a tem5erat3re o 180C. The tem5erat3re o the ater inside the alorimeter inreased and stabilied at 20.< 0C. Cal3late the s5ei heat o the metal and identiy the metal (%eer to Table 1).*ien: s5ei heat o ater G !.18! H/" 0C &. H. Ans: c @ 5(*<"<>33 B 5(*<8 LEA&!
< + Pae
;. L. (7 points)2. %eer to -i3re 1 and sole the olloin 5roblems. . a. $rite the o35led reations that an o3r ith the ormation o C' () at >>0 ;. (9 5ts) . <-e2'9(s) !-e9'!(s) = '2() M*G 290.0 KH '. 2C(ra5hite) = '2() 2C'() M*G "!00.0 KH P. I. <-e2'9(s) = 2C(ra5hite) !-e9'!(s) = 2C'() M*G "170.0 KH %. S. b. Cal3late the ∆*(r4n) o the reation(s) in a. (2 5t) T. M*G "170.0 KH . N. . Determine the ∆S o the reation !-e 9'!(s) = '2() <-e2'9(s). (2 5ts)
$.
m=
( 9 9 0−600 ) ∆ x = =3 .> ∆ y (−230−(−330 ) )
O. . . AA. A+. AC. AD. AE. A-. (15 points) 9. E?3al ol3mes o aidied sol3tion o sodi3m o4alate (0.#0 ) and 5otassi3m 5ermananate (0.105 ) ere mi4ed in a test t3be 3nder di@erent tem5erat3re. The time or the sol3tion to om5letely disolorie as meas3red. A*. A&. T A,. i Test AH. T m t 6 e 3 6 b ; e s A. A;. AL.# 28 1 0 9 AP. 2 A. A'. > 2 9> 9 AS. AI. A%. 90 9 90 9 AN. 9 A. AT. ! 1 29 9 A$. AO. a. $rite the balaned hemial e?3ation or the reation (2 5oints). A. A. b. Determine the rate o the reation(in /s) or eah r3n. The reation is rst order ith res5et to n' !" and rst +A. order oerall. Hint: rate of rxn, rate of disappearance of reactants and rate of formation of prodcts (! 5oints). 3 + Pae
++. %ate 1 +C. %ate 2 +D. %ate 9 +E. %ate ! +-. . Determine the rate onstant K or eah r3n (! 5oints). +*. %3n 1 +,. %3n2 +&. %3n9 +H. %3n! +;. d. Determine the e?3ation o the 5lot o ln K aainst 1/T (9 5oints). +L. +. e. Cal3late the atiation enery6 E a (2 5oints) . +. +'. ?( a ( d C. C. 1 C'. 0.2 R( S( Sile 07.> 97 +T. Ta0le *( S5ei ,eat o etals r CP. Ti CI. 1 C%. 0.2 U( D( A ( S' n 18.7 22 Me% %o/ic ecifc CS. al /ass, 6ea%, a/u 9;.C +O. +. 2<.>8 +. 0.> Al3m 00 in 3 m CA. C+. < CC. 0.9 Co55 9.## 8# er CD. CE. 1 C-. 0.191 *old >7.0 C*. C,. # C&. 0.!#1 &ron #.8# CH. L C;. 2 CL.0.128 CT. Fi.ure *. Ellinham Diaram o e 07.2 Seleted S3bstanes
