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Chemistry questions
  For Examiner’s UseSection AB7B8B9B10Total CHITTAGONG GRAMMAR SCHOOLWinter Semester Examination CHEMISTR !070   #o$rs Candidates answer on the Question Paer!  Additiona Materia s#Answer $oo% et&Paer  REA% THESE I&STRUCTI'&S FIRST Write 'our Centre num(er) *andidate num(er and name on a the wor% 'ou hand in!Write in dar% ( ue or ( a*% en!+ou ma' use a so,t en*i ,or an' dia-rams) -rahs or rou-h wor%in-!.o not use sta es) aer * is) hi-h i-hters) - ue or *orre*tion , uid! .O &'T WRITE IN AN+ $ARCO.ES! Section A  Answer all /uestions!Write 'our answers in the sa*es ro0ided in the Question Paer! Section B  Answer an' t#ree /uestions!Write 'our answers on an' ined a-es and&or searate answer aer! A *o' o, the Periodi* Ta( e is rinted on a-e 12! At the end o, the examination) ,asten a 'our wor% se*ure ' to-ether!The num(er o, mar%s is -i0en in (ra*%ets 3 4 at the end o, ea*h /uestion or art/uestion!This do*ument *onsists o, 0 rinted a-es! 5.R&.R6 T78982&:; <CLES 1229 (T$rn o)er   Section A  Answer all the /uestions in this se*tion in the sa*es ro0ided!The tota mar% ,or this se*tion is =7! *A Se0era sma ie*es o, ma-nesium are  a*ed on a ( o*% o, so id *ar(on dioxide! The so id*ar(on dioxide is at a temerature o, >82 ?C! The ma-nesium is i-nited and another ( o*%o, so id *ar(on dioxide is immediate '  a*ed on to! For  Examiner’s Use (urnin-ma-nesium A 0i-orous rea*tion is o(ser0ed!1M- @ CO 1 → 1M-O @ Cso id *ar(on dioxide  +a, Su--est what *ou d (e seen as the rea*tion ro*eeds to *om etion!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 314 +-, Wh' is another ( o*% o, so id *ar(on dioxide  a*ed a(o0e the (urnin- ma-nesium!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 3B4 +c, State one ,a*tor in the exeriment whi*h s ows down the rea*tion!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 3B4 +., When 1 mo es o, ma-nesium rea*t with one mo e o, *ar(on dioxide) 9B2 % o, ener-' are re eased!Ca *u ate the ener-' re eased when 1!2 - o, ma-nesium rea*ts *om ete ' with *ar(on dioxide!314 +e, In a se*ond exeriment 8!2 - o, ma-nesium and =!= - o, *ar(on dioxide are used! Whi*h so id) ma-nesium or *ar(on dioxide is in ex*essShow 'our wor%in-!314 +/, Ex ain) in terms o, the ener-' *han-es ta%in-  a*e in (oth (ond>ma%in- and (ond>(rea%in-) wh' the rea*tion is exothermi*!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 3143Tota # B24 For  Examiner’s Use  A* Househo d waste *an (e disosed o, (' (ein- dumed into and,i sites) re*'* ed or (urnt!In a and,i site) (a*teria (rea% down 0e-eta( e waste to rodu*e a mixture o, -ases! +a, Name to -ases whi*h are i%e ' to (e ,ormed (' this (a*teria a*tion!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! and !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 314 +-,  A sma amount o, (utanoi* a*id is a so ,ormed (' (a*teria a*tion in and,i sites! .rawthe stru*ture o, (utanoi* a*id!3B4 +c,  A t'e o, Doi  *an (e made ,rom the *e u ose in waste aer! The waste aer isheated at :72 ?C under hi-h ressure and in the resen*e o, a ni*%e *ata 'st! Thee/uation ,or this rea*tion is shown!8C 8 H B2 O 7 → C 11 H 11 O 1 @ BFH 1 O @ CO 1 @ CO @ 8CDoi  +i, State the ,un*tion o, a *ata 'st!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 3B4 +ii, The Doi ) C 11 H 11 O 1 ) *an (e used ,or heatin-! Write an e/uation ,or the *om ete*om(ustion o, this Doi !3143Tota # 84 For  Examiner’s Use
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