Try Out 2 Un Kimia 2012
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- 2.
Untuk menggeser kesetimbangan reaksi ke arah kanan dapat dilakukan dengan ....
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Memperbesar volume
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Menaikkan tekanan
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Menurunka suhu
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Menambahkan katalis
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Memperkecil volume
Correct Answer
A. Menurunka suhuExplanation
Lowering the temperature can shift the equilibrium of a reaction to the right because it causes the reaction to favor the formation of products. According to Le Chatelier's principle, when the temperature is decreased, the reaction will try to counteract the change by producing more heat, which is achieved by favoring the exothermic reaction (the reaction that releases heat). This results in an increase in the concentration of products and a decrease in the concentration of reactants, shifting the equilibrium to the right.Rate this question:
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- 3.
4 mol SO3 dimasukkan dalam bejana 5 liter, dan terurai menurut reaksi 2SO3 (g) ↔ 2SO 2(g) + O2(g). Jika pada saat kesetimbangan tercapai masih ada 1 mol SO3 harga tetapan kesetimbangan adalah . . .
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0,5
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2,7
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5,4
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10,8
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13,5
Correct Answer
A. 2,7Explanation
The equilibrium constant (Kc) for the given reaction can be calculated using the formula: Kc = [SO2]^2 * [O2] / [SO3]^2.
Since 4 moles of SO3 are initially present in a 5-liter container, the initial concentration of SO3 is 4/5 = 0.8 M. At equilibrium, 1 mole of SO3 is still present, so the equilibrium concentration of SO3 is 1/5 = 0.2 M.
Assuming the equilibrium concentrations of SO2 and O2 are x M, the equilibrium constant can be expressed as: Kc = (x^2)(x) / (0.2^2).
Simplifying the equation, we get: Kc = x^3 / 0.04.
Given that the equilibrium constant is 2.7, we can substitute it into the equation and solve for x: 2.7 = x^3 / 0.04.
Multiplying both sides by 0.04 and taking the cube root, we find that x ≈ 2.7^(1/3) ≈ 1.3 M.
Therefore, the equilibrium concentrations of SO2 and O2 are approximately 1.3 M, and the correct answer is 2.7.Rate this question:
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- 4.
Diketahui bahwa jika suhu dinaikan 20oC, laju reaksi akan menjadi tiga kali lipat dari laju semula. Jika pada suhu t oC reaksi berlangsung selama 27 menit, pada suhu (t +60) oC reaksi akan berlangsung selama ....
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9 menit
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3 menit
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2 menit
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1,5 menit
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1 menit
Correct Answer
A. 1 menitExplanation
Based on the given information, we know that if the temperature is increased by 20oC, the reaction rate will become three times faster. Therefore, if the reaction takes 27 minutes at temperature t oC, it will take one-third of that time, which is 9 minutes, at a temperature of (t + 60) oC. Thus, the correct answer is 9 minutes, not 1 minute.Rate this question:
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- 5.
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12 M/dt
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24 M/dt
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36 M/dt
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48 M/dt
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60 M/dt
Correct Answer
A. 48 M/dt -
- 6.
JIka diketahui Ksp PbSO4 = 1,6 x 10-8 maka kelarutannya dalam larutan Pb(NO3)2 0,1 M adalah ….
- 1,6 x 10-9
- 1,6 x 10-7
- 3,2 x 10-8
- 4,0 x 10-4
- 1,6 x 10-4
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Correct Answer
A. IIExplanation
The correct answer is II because the solubility product constant (Ksp) is a measure of the solubility of a compound in a saturated solution. In this case, the Ksp of PbSO4 is given as 1.6 x 10-8. When Pb(NO3)2 is added to the solution, it will dissociate into Pb2+ ions. Since the concentration of Pb(NO3)2 is given as 0.1 M, the concentration of Pb2+ ions will also be 0.1 M. Therefore, the solubility of PbSO4 in this solution will be equal to the concentration of Pb2+ ions, which is 0.1 M.Rate this question:
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Correct Answer
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- 8.
1. C H3 – CH 2 – CH3 + Br2 ----> H3C – CH2 – CH2Br + HBr 2. CH3 – CH2 – OH -----> CH2 = CH2 + H2O Jenis reaksi yang terdapat pada persamaan reaksi nomor 1dan 2 berturut-turut adalah ....
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Adisi dan substitusi
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Substitusi dan eliminasi
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Substitusi dan adisi
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Eliminasi substitusi
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Adisi dan eliminasi
Correct Answer
A. Substitusi dan eliminasiExplanation
The reaction in equation 1 involves the substitution of a hydrogen atom (H) in the CH3-CH2-CH3 molecule with a bromine atom (Br) to form H3C-CH2-CH2Br. This is an example of a substitution reaction, where one atom or group is replaced by another.
The reaction in equation 2 involves the elimination of a water molecule (H2O) from the CH3-CH2-OH molecule to form CH2=CH2. This is an example of an elimination reaction, where a small molecule is removed from a larger molecule.
Therefore, the correct answer is "substitusi dan eliminasi" (substitution and elimination).Rate this question:
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5
Correct Answer
A. 4 -
- 10.
Berikut ini adalah beberapa sifat makromolekul : 1. Tidak tahan pada suhu tinggi 2. Tidak tahan pada perubahan pH yang ekstrim 3. Memiliki ion zwitter; dan 4. Tersusun atas beberapa asam amino Senyawa makromolekul yang cocok dengan sifat tersebut adalah ….
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Lipid
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Selulosa
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Protein
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Karet alam
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Amilum
Correct Answer
A. ProteinExplanation
Protein adalah senyawa makromolekul yang cocok dengan sifat-sifat yang diberikan. Protein tidak tahan pada suhu tinggi dan perubahan pH yang ekstrim. Selain itu, protein tersusun atas beberapa asam amino dan memiliki ion zwitter, yaitu memiliki muatan positif dan negatif pada bagian yang berbeda dalam molekul yang sama. Oleh karena itu, protein adalah pilihan yang tepat berdasarkan sifat-sifat yang diberikan.Rate this question:
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- 11.
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P dan R
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P dan Q
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S dan T
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Q dan S
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R dan Q
Correct Answer
A. P dan R -
- 12.
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Endoterm sebab H awal > H akhir dan ∆H positif
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Endoterm sebab H awal < H akhir dan ∆H positif
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Endoterm sebab H awal < H akhir dan ∆H negatif
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Eksoterm sebab H awal > H akhir dan ∆H negatif
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Eksoterm sebab H awal < H akhir dan ∆H positif
Correct Answer
A. Eksoterm sebab H awal > H akhir dan ∆H negatif -
- 13.
Larutan H2SO4 sebanyak 10 ml dititrasi dengan larutan NaOH 0,1 M. Jika larutan NaOH yang digunakan untuk sampai titik ekivalen adalah 25 ml maka konsentrasi H2SO4 tersebut adalah ....
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2,5 M
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1,25 M
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0,25 M
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0,125 M
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0,061 M
Correct Answer
A. 0,125 MExplanation
The given question involves a titration between a 10 ml solution of H2SO4 and a 0.1 M solution of NaOH. It is stated that it takes 25 ml of the NaOH solution to reach the equivalence point. The equivalence point is reached when the moles of acid and base are equal. From the balanced chemical equation, we know that the ratio between H2SO4 and NaOH is 1:2. Therefore, since it takes 25 ml of 0.1 M NaOH to reach the equivalence point, it means that there were 0.025 moles of NaOH used. Since the ratio is 1:2, it means there were 0.0125 moles of H2SO4 used. Finally, dividing the moles of H2SO4 by the volume of the solution (0.01 L), we can calculate the concentration to be 0.125 M.Rate this question:
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- 14.
Jika pada suhu tertentu diketahui Ksp AgCl = 4 x 10-8 paka pada pencampuran 100 ml larutan AgNO3 0,0004 M dan 100 ml larutan HCl 0,0002 M yang terjadi adalah ….
- Terjadi endapan
- Larutan tepat jenuh
- Belum terbentuk endapan
- Konsentrasi ion Ag+ bertambah
- Konsentrasi ion Cl- bertambah
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Correct Answer
A. IIIExplanation
When 100 ml of 0.0004 M AgNO3 solution is mixed with 100 ml of 0.0002 M HCl solution, there will be no precipitation or formation of a solid. This is because the concentrations of Ag+ and Cl- ions in the solution are not high enough to exceed the solubility product constant (Ksp) of AgCl. Therefore, the correct answer is "Belum terbentuk endapan" which means "No precipitation has occurred".Rate this question:
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Correct Answer
A. V -
- 16.
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1,825 gram
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3,65 gram
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7,3 gram
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14,6 gram
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21,9 gram
Correct Answer
A. 3,65 gram -
- 17.
Untuk memurnikan koloid dari ion pengganggu dapat dilakukan dengan proses dialisis. Proses dialisis tersebut dapat dijumpai pada ....
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Pengendapan lumpur dengan tawas
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Pemutihan gula pasir
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Pencucian darah pada penderita gagal ginjal
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Pemberian norit pada penderita sakit perut
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Pembuatan serum dari darah
Correct Answer
A. Pencucian darah pada penderita gagal ginjalExplanation
Dialysis is a process used to purify colloids from interfering ions. In the case of kidney failure patients, their blood needs to be cleansed and purified through dialysis since their kidneys are unable to perform this function properly. Therefore, the process of blood washing in patients with kidney failure is a form of dialysis, making it the correct answer.Rate this question:
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- 18.
Yang merupakan gugus asam alkanoat adalah
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Correct Answer
A. 2Explanation
Gugus asam alkanoat adalah gugus fungsional yang terdiri dari rantai karbon alifatik yang dihubungkan dengan gugus karboksilat. Dalam pilihan yang diberikan, hanya pilihan 2 yang merupakan gugus asam alkanoat.Rate this question:
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- 19.
Isomer fungsi dari gambar berikut ini adalah ....
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Eti propil eter
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2-etoksi propana
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2-pentanol
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3-heksanol
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Dietil eter
Correct Answer
A. 2-pentanolExplanation
The correct answer is 2-pentanol. Isomer fungsi adalah senyawa yang memiliki rumus molekul yang sama tetapi memiliki susunan atom yang berbeda. Dalam gambar tersebut, 2-pentanol memiliki rumus molekul yang sama dengan senyawa lainnya, tetapi memiliki susunan atom yang berbeda.Rate this question:
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- 20.
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Correct Answer
A. 3 -
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Mar 22, 2023Quiz Edited by
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Feb 15, 2012Quiz Created by
Mustafal
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