FINAL TEST OF 2 st SEMESTER ACADEMIC YEAR 2010/2011

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1 PEMERINTAH KABUPATEN KEBUMEN DINAS PENDIDIKAN PEMUDA DAN OLAH RAGA SMA NEGERI 1 KEBUMEN RINTISAN SEKOLAH BERTARAF INTERNASIONAL Jalan Mayjen Sutoyo 7, Kebumen 54316, Telepon (0287) , Faksimile (0287) sma_1_kbm@yahoo.com, Website: FINAL TEST OF 2 st SEMESTER ACADEMIC YEAR 2010/2011 Subject : Chemistry Year : XI EXACT Day, Date : Tuesday, May 31 th 2011 Time Allocation : (120 minutes) I. Multiple Choise Choose the correct answer in the following questions by give cross symbol (X) on the alphabet a, b, c, d or e in the answer sheet! 1. Which substance can be classified as strong acid? Hydrogen bromide, hydrogen chloride and ethanoic acid Hydrogen chloride, ethanoic acid and formic acid Hydrogen floride, hydrogen chloride and hydrogen iodide Amonium chloride, perchloric acid and ethanoic acid Hydrogen chloride, hydrogen bromide and hydrogen iodide 2. Couple of acid and base conjugate from reaction bellow is. HSO 3- + H 2 O H 3 O + + SO 3 HSO 3- and H 3 O + HSO 3- and SO 3 HSO 3- and H 2 O H 2 O and SO 3 H 3 O + and SO 3 3. Concentration of hydrogen ion found in 250 ml of HCN 0.15 M solution is (Ka= 5x10-10 ) 8.0 x 10-6 M 8.7 x 10-6 M 6.5 x 10-6 M 8.7 x 10-7 M 4.0 x 10-7 M 4. A weak base 0.01 M solution has ph=9. Ionization degree of the base is Pada reaksi gas karbon dioksida dengan air kapur diperoleh reaksi : CO 2(g) + Ca(OH) 2(aq) CaCO 3(s) + H 2 O (l) UKK_1011/XI/CHEMISTRY PAGE 1 OF 10

2 Volume gas CO 2 pada (STP) yang diperlukan untuk menghasilkan kalsium karbonat sebanyak 25 gram adalah.... (Ar C=12, O=16, Ca=40, H=1) 2,8 liter 5,6 liter 8,4 liter 28 liter 36 liter ml silver nitrate 0.1 M with 100 ml calcium chloride 0.2 M produces silver chloride solid. Mass of silver chloride solid is. (Ar Ag = 108 and Cl = 35.5) 2.87 gram 5.74 gram gram gram 28.7 gram 7. Reaksi ion bersih dari reaksi larutan natrium karbonat dengan asam sulfat adalah Na + (aq) + CO 3 (aq) + 2H + (aq) Na 2 SO 4(aq) + CO 2(g) CO 3 (aq) + 2H + (aq) CO 2(g) + H 2 O (l) CO 3 (aq) + H 2 SO 4(aq) H 2 O (g) + CO 2(g) + SO 4 (aq) Na 2 CO 3(aq) + 2H + (aq) Na + (aq) + CO 3 (aq) + H 2 O (l) Na 2 SO 4(aq) + H 2 CO 3(aq) Na 2 SO 4(aq) + H 2 CO 3(aq) 8. Dalam sebuah eksperimen disusun zat-zat sebagai berikut : belerang trioksida, aluminium oksida, kalsium karbonat (batu kapur), asam klorida, magnesium hidroksida, tembaga. Berturut-turut jenis zat tersebut tergolong.... oksida asam, oksida basa, garam, asam, basa dan logam. oksida basa, oksida asam, oksida amfoter, asam, basa dan logam oksida logam, oksida non logam, garam, asam, basa dan logam oksida non logam, basa, garam, asam oksida, asam dan logam asam, basa, oksida asam, oksida basa, oksida amfoter dan logam 9. Reactions bellow doesn t produce gas element. H 2 SO 4 + Na 2 CO 3 NaCl + AgNO 3 K 2 SO 3 + HNO 3 Na 2 S + HCl Fe + HNO ml KI solution 1 M is reacted with 50 ml Pb(NO 3 ) 2 1 M based on reaction bellow: KI (aq) + Pb(NO 3 ) 2 (aq) PbI 2 (s) + KNO 3 (aq) Amount of reactant mole that s over is mol KI 0.05 mol KI 0.05 mol Pb(NO 3 ) mol KI 0.1 mol Pb(NO 3 ) 2 UKK_1011/XI/CHEMISTRY PAGE 2 OF 10

3 11. A base L(OH) 2 has mass of 3.16 grams is dissolved in water. The solution produced can be neutralized by 100 ml of HCl 0.4 M solution. The relative atomic mass (Ar) of L is As much as 0.4 grams of NaOH (Mr = 40) is dissolved into water. The solution formed can neutralize HCl 0.1 M of. 10 ml 20 ml 50 ml 100 ml 110 ml 13. The value of ph does not insignificantly change although it is diluted using water as much as 2 times of the initial volume. It happens in the solution of. NH 4 OH and NH 4 Cl HCl CH 3 COOH NaOH and NaCl NH 4 OH and NaOH 14. Of the following mixtures that can form a buffer is 100 ml of NaOH 0.1 M and 100 ml of HCl 0.1 M 100 ml of NaOH 0.1 M and 100 ml of NaCN 0.1 M 100 ml of NaCN 0.1 M and 100 ml of HCN 0.1 M 100 ml of NH 4 OH 0.1 M and 50 ml of H 2 SO M 100 ml of K 2 SO M and 50 ml of H 2 SO M 15. When HCOOH and HCOOK with equal in concentration are mixed to produce a buffer with ph = 6 log 5, the ratio of their volumes which must be mixed is (Ka CH 3 COOH = 10-5 ) 1 : 1 1 : 2 1 : 3 2 : 1 2 : One liter of solution containing 0.1 mole of potassium acetate and 0.05 mole of acetic acid (Ka = 2 x10-5 ) is added by water so the volume becomes 2 liters, ph of the solution is Changes from 5 into 2 Is constant of 5 Changes from 5 into 8 Changes from 9 into 5 Is constant of 9 UKK_1011/XI/CHEMISTRY PAGE 3 OF 10

4 17. Ke dalam 1 liter larutan asam asetat (ph = 3) ditambahkan garam natrium asetat supaya phnya menjadi 2 kali semula. Apabila Ka =10-5, maka jumlah garam natrium asetat yang ditambahkan adalah mol A buffer system maintaining the value of ph of the protoplasmic cell liquid is HPO 4 /PO 4 3- H 2 PO 4- /HPO 4 HCO 3- /CO 3 H 2 CO 3 /HCO 3 - CH 3 COOH/CH 3 COO Ion berikut mengalami hidrolisis dalam air, kecuali. CO 3 CNˉ NO 3 - S NH Hydrolization salt bellow will be gotten from reaction: Y - + H 2 O HY + OH - (NH 4 ) 2 SO 4 NH 4 NO 3 CaCl 2 KCN MgSO Kedalam 1 liter air dilarutkan 21.4 gram NH 4 Cl padat (volume diabaikan). Bila Kb NH 3(aq) = 10-5 maka ph larutan adalah (Ar N = 14, H = 1, Cl = 35.5) 5 - log log log log log NaCN 0.1 M has ph = 11, so in the water will be hydrolyzed. 10% 25% 50% 1% 100% 23. As much as 25 ml of NaOH 0.2 M is mixed with 25 ml of CH 3 COOH 0.2 M (Ka=10-5 ) will produce solution with ph UKK_1011/XI/CHEMISTRY PAGE 4 OF 10

5 The value of dissociation degree of salt from weak acid is 0.062, Ka =1.8 x 10-10, so in 500 ml that solution will be gotten soluted salt is mol Larutan 25 ml asam cuka 0.2 M dicampur dengan 100 ml natrium hidroksida 0.05 M, kemudian ditambah air sampai volumenya 500 ml. harga ph larutan tersebut adalah (Ka = 10-5 ) The correct formulation of solubility product of Ag 2 CrO 4 is [Ag][CrO 4 ] [Ag + ][CrO 4 ] [Ag + ] 2 [CrO 4 ] [Ag + ] 2 [CrO - ] 4 [Ag 4+ ][CrO 2 ] At a given temperature a saturated solution of Mg(OH) 2 has ph = 9. The value of Ksp of Mg(OH) 2 at that temperature is 5 x x x x x It given that Ksp of PbCl 2 = 1.6 x 10-5, PbCl 2 (Mr= 278) dissolved in 100 ml NaCl 0.1 M is gram gram gram gram gram 29. If given that solubility of Ca(OH) 2 at a given temperature is 2 x 10-2 M, Ksp of Ca(OH) 2 at that temperature is 2.0 x x x x x 10-6 UKK_1011/XI/CHEMISTRY PAGE 5 OF 10

6 30. At a given temperature the saturated solution of Be(OH) 2 has ph = 8+log 2, the value of Ksp of Be(OH) 2 at that temperature is 1.0 x x x x x Ksp of PbCl 2 at agiven temperature is 4 x 10-18, the solubility of PbCl 2 in CaCl M solution at that temperature is 1 x x x x x Pay attention to the value of Ksp for the following sal!t. 1. Ksp Ag 2 CO 3 = Ksp AgCl = 1, Ksp PbCO 3 = Ksp PbI 2 = Ksp PbSO 4 = Based on the data above, one of the salts which has the largest solubility in water is Dalam suatu larutan terdapat ion-ion Ba 2+,Ca 2+,Mg 2+,Pb 2+ dengan konsenrasi yang sama. Apabila larutan itu ditetesi dengan larutan Na 2 CO 3 maka zat yang pertama mengendap adalah. BaCO 3 (Ksp = 8,1x10-9 mol 2 /L 2 ) PbCO 3 (Ksp = 3,3x10-14 mol 2 /L 2 ) CaCO 3 (Ksp = 4,8x10-9 mol 2 /L 2 ) MgCO 3 (Ksp = 1x10-5 mol 2 /L 2 ) Mengendap semua 34. Substances below which is not an example of colloidal system is Milk Coconut squeeze (santan) Smoke Protoplasm Hydrochloric acid 35. Fog (kabut) is a colloidal system of Gas in liquid Liquid in gas Gas in other gas Gas in solid UKK_1011/XI/CHEMISTRY PAGE 6 OF 10

7 Liquid in other liquid 36. One example of lyophilic colloids is Jam (selai) Smoke Dew (embun) Gelatin Floatable rock (batu apung) 37. An electrolytic solution which is effective for coagulating As 2 S 3 sol which is negatively charged is AlCl 3 NaCl K 2 SO 4 CaCl 2 SrCl Diketahui peristiwa berikut : 1. Pembentukan delta pada muara sungai 2. Pemutihan gula pasir 3. Penyembuhan sakit perut dengan norit 4. Proses penjernihan air Yang merupakan contoh peristiwa koagulasi koloid adalah 1 dan 2 1 dan 3 1 dan 4 2 dan 3 2 dan Making colloids can be done by methods of : 1. Hydrolysis 3. Redox reaction 2. Peptization 4. Milling or crushing (penggilingan atau penggerusan) Colloid making in condensation is number 1 dan 2 1 dan 3 1 dan 4 2 dan 3 2 dan Di antara cara-cara pembuatan koloid berikut yang merupakan cara dispersi adalah Pembuatan sol belerang dengan dialiri gas H 2 S dalam larutan SO 2 Pembuatan sol emas dengan mereduksi larutan garam emas Pembuatan sol Fe(OH) 3 dengan menambahkan FeCl 3 dalam air mendidih Pembuatan kanji dengan memanaskan amilum Pembuatan AgCl dengan mereaksikan larutan AgNO 3 encer dengan larutan NaCl II. Essay encer gram aluminium is reacted to 100 ml sulfuric acid 2 M. Determine: a. Reaction equation UKK_1011/XI/CHEMISTRY PAGE 7 OF 10

8 b. The volume of gas produced if at that temperature and pressure of 3 grams of 1 NO gas is 1L. (Ar Al = 65, S = 32, O = 16, N = 14) ml of a strong base NaOH 1,2 M is reacted to 50 ml of formic acid (HCOOH) 0,66 M solution, so a buffer is formed, if Ka HCOOH=10-4, calculate ph of the solution! 3. As much as 1.58 grams of (CH 3 COO) 2 Ca is dissolved in water so the volume of solution becomes 500 ml, if Ka = 10-5, calculate ph of the solution! (Ar C = 12, H = 1, Ca = 40, O = 16) 4. What must be the H + concentration of a solution that is 0.05 M in Ni 2+ to prevent the precipitation of NiS when the solution is saturated with H 2 S? The Ksp of NiS is 3x10-21, Ksp H 2 S is 1.1x Jelaskan prinsip kerja sabun atau detergen sebagai bahan pencuci! UKK_1011/XI/CHEMISTRY PAGE 8 OF 10