FINAL TEST OF 2 st SEMESTER ACADEMIC YEAR 2010/2011

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) 381407, Faksimile (0287) 385012

E-mail: sma_1_kbm@yahoo.com, Website: www.sman1-kebumen.sch.id

FINAL TEST OF 2

st

_SEMESTER

ACADEMIC YEAR 2010/2011

Subject : Chemistry

Year : XI EXACT

Day, Date : Tuesday, May 31th ₂₀₁₁

Time Allocation : 07.30 -09.30 (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?

A. Hydrogen bromide, hydrogen chloride and ethanoic acid

B. Hydrogen chloride, ethanoic acid and formic acid

C. Hydrogen floride, hydrogen chloride and hydrogen iodide

D. Amonium chloride, perchloric acid and ethanoic acid

E. Hydrogen chloride, hydrogen bromide and hydrogen iodide

2. Couple of acid and base conjugate from reaction bellow is…. HSO3- + H2O H3O+ + SO3 2-A. HSO3- and H3O+ B. HSO3- and SO3 2-C. HSO3- and H2O D. H2O and SO3 2-E. H3O+ and SO3

2-3. Concentration of hydrogen ion found in 250 mL of HCN 0.15 M solution is… (Ka= 5x10-10₎ A. 8.0 x 10-6 _M B. 8.7 x 10-6 _M C. 6.5 x 10-6 _M D. 8.7 x 10-7 _M E. 4.0 x 10-7 _M

4. A weak base 0.01 M solution has pH=9. Ionization degree of the base is… A. 0.005

B. 0.01 C. 0.001 D. 0.05 E. 0.1

5. Pada reaksi gas karbon dioksida dengan air kapur diperoleh reaksi : CO2(g) + Ca(OH)2(aq) → CaCO3(s) + H2O(l)

Volume gas CO2 pada (STP) yang diperlukan untuk menghasilkan kalsium karbonat sebanyak 25 gram adalah ... . (Ar C=12, O=16, Ca=40, H=1)

A. 2,8 liter B. 5,6 liter C. 8,4 liter D. 28 liter E. 36 liter

6. 100 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)

A. 2.87 gram B. 5.74 gram C. 1.435 gram D. 14.35 gram E. 28.7 gram

7. Reaksi ion bersih dari reaksi larutan natrium karbonat dengan asam sulfat adalah… A. Na+

(aq) + CO32-(aq) + 2H+(aq) Na2SO4(aq) + CO2(g) B. CO32-(aq) + 2H+(aq) CO2(g) + H2O(l)

C. CO32-(aq) + H2SO4(aq) H2O(g) + CO2(g) + SO42-(aq) D. Na2CO3(aq) + 2H+(aq) Na+(aq) + CO32-(aq) + H2O(l) E. Na2SO4(aq) + H2CO3(aq) Na2SO4(aq) + H2CO3(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 ... .

A. oksida asam, oksida basa, garam, asam, basa dan logam.

B. oksida basa, oksida asam, oksida amfoter, asam, basa dan logam

C. oksida logam, oksida non logam, garam, asam, basa dan logam

D. oksida non logam, basa, garam, asam oksida, asam dan logam

E. asam, basa, oksida asam, oksida basa, oksida amfoter dan logam

9. Reactions bellow doesn’t produce gas element. A. H2SO4 + Na2CO3

B. NaCl + AgNO3 C. K2SO3 + HNO3 D. Na2S + HCl E. Fe + HNO3

10. 200 mL KI solution 1 M is reacted with 50 mL Pb(NO3)2 1 M based on reaction bellow:

KI(aq) + Pb(NO3)2 (aq) PbI2 (s) + KNO3 (aq) Amount of reactant mole that’s over is …. A. 0.15 mol KI

B. 0.05 mol KI

C. 0.05 mol Pb(NO3)2 D. 0.1 mol KI

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… A. 124 B. 158 C. 182 D. 274 E. 316

12. As much as 0.4 grams of NaOH (Mr = 40) is dissolved into water. The solution formed can neutralize HCl 0.1 M of ….

A. 10 mL B. 20 mL C. 50 mL D. 100 mL E. 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 ….

A. NH4OHand NH4Cl

B. HCl

C. CH3COOH

D. NaOH and NaCl

E. NH4OH and NaOH

14. Of the following mixtures that can form a buffer is… A. 100 mL of NaOH 0.1 M and 100 mL of HCl 0.1 M B. 100 mL of NaOH 0.1 M and 100 mL of NaCN 0.1 M C. 100 mL of NaCN 0.1 M and 100 mL of HCN 0.1 M D. 100 mL of NH4OH 0.1 M and 50 mL of H2SO4 0.1 M E. 100 mL of K2SO4 0.1 M and 50 mL of H2SO4 0.1 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 CH3COOH = 10-5) A. 1 : 1 B. 1 : 2 C. 1 : 3 D. 2 : 1 E. 2 : 3

16. 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…

A. Changes from 5 into 2 B. Is constant of 5

C. Changes from 5 into 8 D. Changes from 9 into 5 E. Is constant of 9

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. 1 B. 0.1 C. 0.01 D. 0.001 E. 0.0001

18. A buffer system maintaining the value of pH of the protoplasmic cell liquid is… A. _HPO 42-/PO4 3-B. _H 2PO4-/HPO4 2-C. _HCO 3-/CO3 2-D. _H 2CO3/HCO3 -E. _CH 3COOH/CH3COO

-19. Ion berikut mengalami hidrolisis dalam air , kecuali…. A. CO3

2-B. CNˉ C. NO3 -D. S 2-E. NH4+

20. Hydrolization salt bellow will be gotten from reaction: Y- _{+ H}

2O HY + OH -A. (NH4)2SO4 B. NH4NO3 C. CaCl2 D. KCN E. MgSO4

21. Kedalam 1 liter air dilarutkan 21.4 gram NH4Cl padat (volume diabaikan). Bila Kb NH3(aq) = 10-5 maka pH larutan adalah…(Ar N = 14, H = 1, Cl = 35.5)

A. 5 - log 2 B. 6 - log 1 C. 9 + log 2 D. 11 - log 4 E. 13 + log 4

22. NaCN 0.1 M has pH = 11, so in the water will be hydrolyzed…. A. 10%

B. 25% C. 50% D. 1% E. 100%

A. 10 B. 9 C. 8 D. 5 E. 4

24. 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.

A. 0.0037

B. 0.0075

C. 0.0100

D. 0.0150

E. 0.0300

25. 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₎ A. 8 B. 8.5 C. 9 D. 9.5 E. 10

26. The correct formulation of solubility product of Ag2CrO4 is… A. _[Ag][CrO 4] B. _[Ag+_][CrO 42-] C. _[Ag+_]2_[CrO 42-] D. _[Ag+_]2_[CrO-_]4 E. _[Ag4+_][CrO2_] 4

27. 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…

A. _{5 x 10}-5 B. _{5 x 10}-15 C. _{1 x 10}-15 D. _{5 x 10}-16 E. _{1 x 10}-16

28. It given that Ksp of PbCl2 = 1.6 x 10-5, PbCl2 (Mr= 278) dissolved in 100 mL NaCl 0.1 M is… A. 0.448 gram B. 0.04448 gram C. 44.48 gram D. 444.8 gram E. 4.448 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…

A. _{2.0 x 10}-4 B. _{4.0 x 10}-4 C. _{3.2 x 10}-5 D. _{6.4 x 10}-6 E. _{8.0 x 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…

A. _{1.0 x 10}-12 B. _{2.0 x 10}-12 C. _{1.0 x 10}-18 D. _{2.0 x 10}-18 E. _{4.0 x 10}-18

31. Ksp of PbCl2 at agiven temperature is 4 x 10-18, the solubility of PbCl2 in CaCl2 0.05 M solution at that temperature is…

A. _{1 x 10}-8 B. _{1 x 10}-12 C. _{4 x 10}-16 D. _{4 x 10}-17 E. _{4 x 10}-19

32. Pay attention to the value of Ksp for the following sal!t. 1. Ksp Ag2CO3 = 8.10-12

2. Ksp AgCl = 1,6 . 10-10 3. Ksp PbCO3 = 1.10-10 4. Ksp PbI2 = 9.10-13 5. Ksp PbSO4 = 2.10-10

Based on the data above, one of the salts which has the largest solubility in water is…. A. 1 B. 2 C. 3 D. 4 E.5

33. Dalam suatu larutan terdapat ion-ion Ba2+_,Ca2+_,Mg2+_,Pb2+ _{dengan konsenrasi yang} sama. Apabila larutan itu ditetesi dengan larutan Na2CO3 maka zat yang pertama mengendap adalah…. A. BaCO3 (Ksp = 8,1x10-9 mol2/L2) B. PbCO3 (Ksp = 3,3x10-14 mol2/L2) C. CaCO3 (Ksp = 4,8x10-9 mol2/L2) D. MgCO3 (Ksp = 1x10-5 mol2/L2) E. Mengendap semua

34. Substances below which is not an example of colloidal system is… A. Milk

B. Coconut squeeze (santan) C. Smoke

D. Protoplasm E. Hydrochloric acid

35. Fog (kabut) is a colloidal system of… A. Gas in liquid

B. Liquid in gas C. Gas in other gas

E. Liquid in other liquid

36. One example of lyophilic colloids is… A. Jam (selai)

B. Smoke

C. Dew (embun) D. Gelatin

E. Floatable rock (batu apung)

37. An electrolytic solution which is effective for coagulating As2S3 sol which is negatively charged is…

A. AlCl3 B. NaCl C. K2SO4 D. CaCl2 E. SrCl2

38. 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… A. 1 dan 2

B. 1 dan 3 C. 1 dan 4 D. 2 dan 3 E. 2 dan 4

39. 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…

A. 1 dan 2 B. 1 dan 3 C. 1 dan 4 D. 2 dan 3 E. 2 dan 4

40. Di antara cara-cara pembuatan koloid berikut yang merupakan cara dispersi adalah…

A. Pembuatan sol belerang dengan dialiri gas H2S dalam larutan SO2 B. Pembuatan sol emas dengan mereduksi larutan garam emas

C. Pembuatan sol Fe(OH)3 dengan menambahkan FeCl3 dalam air mendidih D. Pembuatan kanji dengan memanaskan amilum

E. Pembuatan AgCl dengan mereaksikan larutan AgNO3 encer dengan larutan NaCl encer

II. Essay

1. 8.1 gram aluminium is reacted to 100 mL sulfuric acid 2 M. Determine:

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)

2. 25 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 (CH3COO)2Ca 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 H2S?

The Ksp of NiS is 3x10-21_{, Ksp H}

2S is 1.1x10-22