, :::.l9 &30 ~!fjrkh:+l. ~ S/::T..:=4... A studnt has four solutons lablld A, B, C and D. Each soluton contans on compound from th followng lst: FCh Th studnt dos som smpl tsts to dntfy th compounds prsnt. Th tabl shows th tsts and obsrvatons. Soluton Colour Add sodum hydroxd soluton Add dlut ntrc acd and slvr ntrat soluton A colourlss pungnt gas gvn off wht prcptat B blu blu prcptat no chang C colourlss no chang no chang D grn grn prcptat wht prcptat (a) () What s th pungnt gas formd by soluton A?... Q..~.~.DJ.y.t.../..~..H3......... () Whch on must b prsnt n A for th wht prcptat to fonn?...~. ~9..~~.~.~.../...g.. ~............ () Whch on must b prsnt n B for th blu prcptat to folm?.. Wp~... (~. } / ~~~ Q??~... (v) Whch on must b prsnt n D for th grn prcptat to form?... E?=:....!...1.c.Qt\.. LJ.!.)...~ro.. ~.s... (b) () Whch compound n th lst can b dntfd usng barum chlord soluton?...000.. ~9..4../...(9p.~.(~!.!.. ~.~~... () Stat on compound n th lst that can b dntfd usng a flam tst. Stat th colour of th flam. Compound.. fk~.<:).3...9..1<;...!..0.0.q.!f...h..h... Flam colour L!&.1 ~... H L.B~...H 10 ( calollv d~ c:aa.~ Of) ~c...t ~)...::=._'' 111111111111.1111111111111111111111111111111111111111111111111111111111
_.._._._.._... _........_....._... _....._... _..._......._._........._..._._... _.....,... _.. _,! (c) Slvr ntrat soluton, AgN03(aq), s addd to a soluton of lthum odd, L. () Dscrb what s sn. CJ::.\.O:N pl?qp.j~g,... ~......l f.?p t:..)... () Wrt th chmcal quaton, ncludng stat symbols, for th racton. A8NQ3("').. ± l::c ~ :r:: 4) ~ A.j;w... l:~/r:!()3 ~) t) ~~~ rs~.:....................... (3) Q4 ) p.. _....~... < ;2. ~U fol ~ r 'l ~\.A.t.,f 6~ S) P (~ Sodum hydroxd racts wth both ron(l) chlord and wth ron() chlord. Dscrb how you could us sodum hydroxd soluton to dstngush btwn sold sampls of ron(l) chlord and ron(u) chlord. Gv brf dtals of what you would do and what you would obsrv n ach cas....~... fy1o..m...~(:q.r..~..~...f0:!;;9...~~.<::~./.q.~. \ ~ 8 ~ p f? ~...... ~...!?('O.~0....p..p.t:............ ~... C'O".tY.:'~~.~...,(~.0.~.'.~... ~f...0.:t...... ~.Q(.?j::... <0 NL 0 b srvoj.: lct"v (0 C)\. G o:1l01'./'...,...,...,...... (..~.....8 ~...Pf?t.... ~...±!?...F.~~:...... Q7 OR bcnn ppt ~ a r 3+) (4) l (OJ Whn watr s addd to wht anhydrous coppr() sulphat, blu hydratd coppr() sulphat s formd. Wrt a chmcal quaton for th racton that occurs. nclud stat symbols n th quaton. (uso + 5/;t 0 7 Cu.SO." SH 0....f:.f.:. (.5)...:,l.....(1/)...f........;;l:..'(S')... (3) Q8. "'''( '/ L._.._.._...... :2:; ;.........._..._..._._L......_) 111111111111 1111111111 111111111111111111111111111111111111111111111111 Turn ovr
A studnt carrs out a tst to show that a soluton of hydrogn chlord contans chlord ons. Frst sh adds dlut ntrc acd. () Nam th othr soluton sh adds.............s..l.tv.:~...n.~..t.~~...................... () Dscrb what sh obsrvs......_......h..b.~.~...p.tj20.p. ~0.:'t~................ CppC) () Complt th quaton to show th racton that occurs.......a 9 N Q3 + HC] t...... A.3.. ~...............H:.N.9. 3....... 'c..j. L.. _....{f)....... (!) () Dscrb smpl tsts that can b usd to show that th soluton producd n th racton contans Q5 () potassum ons Tst...Jj.0:~.~...t.~.p......~.~C~P~...~..J..0.~ l((ac.. '. Rsult........................................... _..... () sulph4t ons Tst... ~.4.9...~.~...~~.~.~J.~.0.~...9.:~. g....1 U.......~.....Q..0..~.~.~.~....0.. ~.<?~.(..~......!.!3. ~..q.2... Rsult..........~~......p.~P. ~.~................... (ppc) (3) Q8.._.. _L _...L.....1..._._. _._._. _.. """..._...... l(f) J ~ ~a) A. sruant addd a pc of lthum to a trough of watr. A pc of platnum wr s dppd nto th soluton formd and thn hld n a hot Bunsn flam. () What colour dos th flam bcom?...........(~............................................................... () What s th formula of th on rsponsbl for ths colo.ur?.................. ~~.~...............................................;..... 9 11111111111111111111111111111111111111111111111111111111111111111. Turn ovr N 2 4 3 1 O A 0 9 2 0 ~
. Damp ltmus papr s usd to tst for som gass. Gas Damp blu ltmus papr Damp rd ltmus papr ammoma stays blu turns blu carbon doxd turns rd stays rd chlorn turns wht turns wht hydrogn stays blu stays rd sulphur doxd turns rd stays rd A studnt s gvn fv gas jars, lablld P, Q, R, Sand T, ach contanng on ofth gass n th tabl abov. Each gas was tstd wth damp ltmus papr. Th studnt was told to us th nformaton n th tabl abov to wrt a concluson. Th rsults and conclusons ar shown blow. Gas Rsult Concluson P blu ltmus turns rd rd ltmus stays rd P must b carbon doxd Q blu tmus turns wht Q has to b chlorn R S T blu ltmus turns rd rd tmus stays rd blu ltmus stays blu rd ltmus turns blu blu ltmus stays blu rd ltmus stays rd R s sulphur doxd 5 can only b ammona T must b hydrogn (a) dntfy two gass for whch th conclusons ar dfntly corrct. { ~" ~j~:~;;:;: ~; ~.T/~j cj ~0./(f;~ (b) dntfy two gass for whch th conclusons ar possbly corrct....~...p./.. c..(&.~ ~... d..~9..~.\.0.p.:./...w..22... ~ R/ s. d n/v,u' 0110 t<d.1! 0' 2 F5 1 vv"'r (Total 4 marks) 1 TOTAL FOR PAPER: 50 MARKS END 14 1+ 111111111111111111111111111.11111111111.11111111111111111111111111111111
Th ons prsnt n onc compounds can b dntfd usng smpl tsts. Th frst tabl shows th flam tst colours for thr catons. Caton lthum sodum strontum Flam tst colour rd ylloworang rd Th nxt tabl shows thr tsts that may b usd to dntfy anons n soluton. Anon ntrc acd s addd Rsult of tsts whn magnsum sulphat soluton s addd carbonat ffrvscnc prcptat forms blu unvrsal ndcator s addd hydrogncarbonat ffrvscnc no prcptat forms dark grn hydrognsulphat no ffrvscnc no prcptat forms rd hydroxd no ffrvscnc prcptat forms blu sulphat no ffrvscnc no prcptat forms grn Two onc compounds, P and Q, ar known to contan only anons and catons lstd n th tabls. Thy wr analysd usng som of th tsts n th tabls. (a) Compound P gav a ylloworang flam tst and producd ffrvscnc whn ntrc acd was addd. Suggst two possbl dntts for compound P. 1...~.9..~!~...~9.::~. 9.. ~~....................... 2...:?9.~.(.~.~.......b:.'d~.~.f.j~... ~~.~~................. (3) 14 :>. 1111111111111111111111111111111111111111111111111111 11111 1111111111111
_........_.._._... _...._...._......_._._....... _..._ (b) Compound Q gav a rd flam tst and causd unvrsal ndcator to tum blu. A studnt concludd that compound Q was strontum hydroxd_ () Gv two rasons why w cannot b crtan ths concluson s corrct. 1...8.9...~...~{.....~.0::g... ~r...b.. ~.~~:...(:~.(~t.l:?:.~ 2....f3Q.))y...(~.~g.~.g...~.~...hcJ..0..(9..~J~.....llm:...~.J;;...Q.(~... () Usng th nformaton n th tabls, gv on furthr tst that could b don to show that compound Q s a hydroxd. Gv th xpctd rsult of th tst....mg...c0.~..~.r.:~~)...0.y.q... ~.....q~...nqt... jj.u. Total 6 marks 1 (v) Dscrb a tst, and ts rsult, to show that soluton P contans chlord ons. Q4. Tst... ~...$..J.!.y..~...~.~~~.~...lft3.. N.q3...Cs..~ (~1uor) \"..0:1Y.d....c~... :~v..(.<;..0..'1..0../.~.93 Rsult...0.(.~~...p..~.t...p. ~........... (3) ~ ~~ _ j ' '1 :...~:..........._........_.._......._._.. _ "'''''''''..._...) 15 111111111111 11111 11111 H 111111 1111 1111111111 11111 1111111111111
Papr chromatography can b usd to sparat a mxtur of food dys (M), and to dntfy th dys by comparson. Th dagram shows th apparatus usd. ~ 1\ mxtur of food dys r.. M P QRS (a) Th food dys ar placd on th papr about 2 cm up from th bottom dg. Why s t mportant not to plac thm at th bottom of th papr?...~... 0.(9..~...0.vn.r;;lv.~...C.. /0....~...~~) n dvdual f ood dys ~ watr (b) Stat two obsrvatons you would mak durng th xprmnt. 1.... ld..~~...(!.~...v...p.../2..~.............. 4 2......(p(Q.~'(5.....~0.~f!:...~...(AQ.~.(5.........!............d.~.....~.~...~...~............... 7, 11111111111111111111111111111111111111111111111111111111111111111 N 2 4 3 2 3 A 0 4 2 0!!, '."
... (c) At th nd of th xprmnt th papr s rmovd and drd. Th dagram shows th papr. +.. M P Q R S () Masur th dstanc movd by food dy R durng th xprmnt. 3~ 5 (Yyl... ~.... () Whch of th food dys P, Q, Rand S ar prsnt n M?...~...9:.~...P:...... () Food dys P and S movd vry lttj. Suggst on chang you could mak to ths xprmnt to hjp thm mov furthr... ~...G.!\9;t.~... (~..q.0..,...~../..o.~r.0:?...s:q!.~v (M).. [0" ~ Q2 ~ (Total 6 marks) ~ l"._ g',_.._.. 5 11111111111111111111111111111111111111111111111111111111111111111 Turn ovr N 2 4 3 2 3 A 0 5 2 0