1. 9 8 p.Write down the equations for each reaction of the following chain!NaNaOHNaClHClZnCl2ZnSO4Zn(OH)2Zn(NO3)2ZnO2. 9 5 p. !" g 2# Cr2(SO4)3 solution was addedCr2(SO4)3$!H2O until %art of Cr2(SO4)3 in solutions &eco'es 3"#$Calculate the 'ass of Cr2(SO4)3$!H2O added to solution!3. 9 8 p.(he che'ical for'ula of 'ineral selenite could &e written) CaSO4*+$ ,*%eri'ental- is esta&lished that selenite contains 23.3 # calciu'. /.0 # sul%hur. !!./ # o*-gen and one 'ore ele'ent$What is che'ical for'ula of selenite! How 'uch of seleniu' contains selenite14. 9 13 p.2i'estone usuall- contains a &it of sand$ (o deter'ine the 'ass %art of calciu' car&onate in li'estone a sa'%le weighting "$323 g is treated with "$"" 'l of h-drochloric acid wih concentration "$4!!! 'ol4l$ (he e*cess of h-drochloric acid is neutrali5ed with 2"$4 'l of sodiu' h-dro*ide ("$"" 'ol4l)$a) Calculate the 'ass %art of calciu' car&onate in the li'estone$6ncleared li'e was o&tained fro' the gi7en li'estone howe7er calciu' car&onate was not co'%letel- resol7ed$ (o deter'ine the %art of calciu' car&onate resol7ed a sa'%le ofuncleared li'e ("$ g) was treated with "$"" 'l of h-drochloric acid ("$4883 'ol4l)$ ,*cess of h-drochloric acid was neutrali5ed with 4$24 'l of sodiu' h-dro*ide ("$"" 'ol4l)$&) Calculate the co'%osition of the uncleared li'e$5. 9 6 p.9n coo:er- to 'a:e duff looser a''oniu' h-drogencar&onate is used$ Write down the equations to o&tain the co'%ound onl- fro' car&on. air and water$6. 9 5 p.;rou% the o*ides according to the conditions $e2O3 . SO3 . ?aO . @2O! 1. Oxides form acids when reacting with water 2. Oxides form bases when reacting with water 3. Oxides form alkali when reacting with water 4. Oxides doesn't react with water 9n cases when reaction occurs write the a%%riate equation!7. 9 11 p.While sol7ing in water 3$0" g of a white cr-stalline su&stance A. occured 3$30 l of h-drogen gas$ While sol7ing in water 4$2 g of a si'ilar white cr-stalline su&stance B. occurs 4$4/ l of h-drogen gas$ Said that in the &eginning of the 2"th Centur- co'%ound B was used for 'ilitar- %ur%oses$1. Name substances A and B! 2. Write the euations the reactions occoured! 3. !an "ou sa" for what #ur#ose substance B was used during World War One$ 8. 9 8 p.?- long heating of 'agnesiu' car&onate h-drate its 'ass decreased 4$4 ti'es$Aeter'ine the for'ula of 'agnesiu' car&onate h-drate and write the equations for che'ical reactions$9. 9-10 6 p.On 3.0 gra's of sodiu' chloride was %oured e*cess of conc$ sulfuric acid and the e7ol7ed gas was introduced in "0 g of 2"$"# sodiu' car&onate solution$ Wheather the o&tained solution will &e acidic or al:aline110. 10 8 p.Write down the equations for each reaction of the following chain!CO2Na2CO3NaHCO3Na2SO4Na?rNaNO3HNO3>e(NO3)3 >e(OH)311. 10 5 p.>isher'en catched %laices and &rought the' ho'e$ So'e fisher'an usher the' in a &ath filled with fresh water. after so'e ti'e the %laices &eca'e 'uch &older$ Wh-1 What should the fisher'an do to let %laices li7e in the &ath112. 10 6 p.Nowda-s a 'odern and widel- used 'ethod of anal-ses is 'ass%ectrogra%h- wich is &ased on sorting the %articles according to their 'ass$Bir was anal-sed with a 'ass%ectro'eter$ (he o&tained 'ass%ectru' is shown in the %icture$Sol7e the s%ectru' %ointing cou'%ounds related to the %ea:s in the s%ectru'$=. g4'ol13. 10 6 p.When %rotractedl- holded in the air water o&tained fro' an underground water source usuall- occurs &rown %reci%itation of iron(999) h-dro*ide although instantl- o&tained underground water usuall- doesnCt contain >e3D ions$ How is this to &e e*%lained114. 10 6 p."" 'l of water in 2"C was saturated with a''onia and in this solution car&on dio*ide was introduced until the co'%osition of the solution &eca'e constant$ Occured 0" g of %reci%itation$ Calculate the co'%osition of the solution after the introduction of car&on dio*ide$ (he solu&ilit- of car&on dio*ide should &e discounted$ 9n 2"C te'%erature solu&ilit- of a''onia in water is !2$0 l in "" l of water$15. 10 5 p.9n ther'al %ower stations itCs i'%ortant to %re7ent incrustation in &oilers$ (he hardness ofwater is eli'inated using ionits < &alls of %ol-'er containing ESO3H grou%s$ H-drogen ato's in these grou%s are a&le to e*change with calciu' or 'agnesiu' ions)calciu' and 'agnesiu' ions re'ain &ounded to the %ol-'er$ Calculate 'ass for ionite needed to soften ." '3 water with total hardness 3." ''ol4l$ ." g of ionite contains " ''ol ESO3H grou%s$16. 10 5 p.9n the water of a salt la:e 'ainl- sodiu' chloride is found during su''er it cr-stalli5es$ Howe7er in winter cr-stalli5ation of another co'%ound 'a- occur and the for'ed %reci%itation can last e7en until the ne*t su''er$ >ro' $"" tonn of this co'%ound one 'a- o&tain to 08 :g of co''on salt$ What is this co'%ound and how can one o&tain co''on salt fro' it117. 10-11 6 p.9tCs certain that gaseous NO2 'olecules in low te'%eratures di'eri5e$ ,*%lain wh- a si'ilar %rocess doesnCt occour with 'olecules of SO2 $18. 11 8 p.Write down the equations for each reaction of the following chain!CaCO3CaOCaCl2CaSO4CaSCaCl2Ca3@O4Ca3@2@H319. 11 8 p.(o "$!"" litres of ?aCl2 solution whose os'otic %ressure at 2""C is 4$0 :@a was added "$!"" litres Na2SO4 with the sa'e os'otic %ressure$ Calculate quantit- of su&stances in the gi7en solutions as well as in the o&atained and the os'otic %ressure of the o&tained solution$20. 11 5 p.,s%eciall- co'forta&le wa- to 7erif- when the distilled water has actuall- &een distilled is to deter'ine its %H$9f %H is near to 3$" then the water is distilled in the sa'e da-9f %H is in the inter7al !$!F0$" the water is distilled so'e da-s ago$,*%lain the sense of this test if necessar- write down equations for a%%ro%riate reactions$21. 11 8 p.(o 2""." g of 24.34# >eCl3 solution was added 0$3! g of 5in: %owder and then the &owl was closed$ Su&stances in the solution reacted$ Bfter the reaction to a sa'%le of the solution %otassiu' rodanide was added$ (he solution didnCt &eca'e red$ When solution ofa''onia was added to another sa'%le %reci%itation for'ed$ ?- adding 'ore a''onia the a''ount of %reci%itation decreased$Calculate the co'%osition of the solution after the reaction$22. 11 11 p.9n se%arate &owls 3."" g @&(NO3)2 and .!/" g G=nO4 was heated and the for'ed gaseswere introduced inlitre of water$ 9n the sa'e water also was introduced a gas for'ed while .""/ g of Na2SO3 reacting with e*cess of sulfuric acid$ (o what 7olu'e should theo&tained solution &e diluted for its %H to &eco'e 4$23. 11 15 p.Colourless su&stance B doesnCt react with o*-gen nor in the roo' te'%erature nor in ele7ated te'%erature howe7er it)$ e*other'ical- reacts with a sil7er whose che'ical co'%osition is the sa'e as that of C$What are co'%ounds B1 Write equations of the che'ical reactions noted$24. 11-12 14 p.9n 34/ the cit- of @o'%ei &uried &- 7olcano in 38 BA was digged out$ B'ong the %lent- of findings a frag'ent of the Io'an water%i%e was o&tained which was coated &- a dense -ellowish o*ide$ (o find out what was the water%i%e 'ade of che'ists acted as follows) weighted 2$"" gra's of the water%i%eCs frag'ent ('etal with the o*ide) and thendro%%ed dro% &- dro% !"$" # acetic acid (uni7alent acid. HB) solution (J ."0 g4 'l. %HB J 0". g4 'ol) until the sa'%le was co'%etel- dissol7ed$ (he- needed 2$3 'l of acetic acid for it$Aeter'ine what 'etal the water%i%e was 'ade of$,*%lain the choice of the ancient Io'ans$25. 11-12 8 p.(he 7er- to% of the =onu'ent of >reedo' < =other 2at7ia is co7ered with &asical co%%er(ii) car&onate (CuOH)2CO3 or Cu(OH)2*CuCO3 la-er$ (his co'%ound is water insolu&le &ut as one can see in the u%%er %art of the =onu'entCs colu'n a %art of Cu(OH)2*CuCO3 fro' the head of the =onu'ent has shifted down the col'un &ecause of rain (see the %icture)$ (r- to e*%lain how the insolu&le &asical co%%er car&onate can &eshifted down &- rain$26. 12 8 p.Write down the equations for each reaction of the following chain!C2H!OHCH3COOHCH3COOCH3CH3OHCH3OCH3CO2G2CO3 =nCO3=n(NO3)227. 12 6 p.When ."" l of cis&2