Contoh Soal Latihan Ukg 2015 Untuk Guru Kimia
Pada latihan soal untuk persiapan UKG 2015 online ini terdapat 12 soal untuk mata pelajaran kimia yang dibuat berdasarkan kisi-kisi UKG 2015. Waktu yang dialokasikan untuk mengerjakan soal-soal ini adalah 30 menit maksimal. Latihan soal UKG lainnya dapat dilihat pada http://novehasanah.blogspot.co.idSelamat berlatih, semoga sukses.
Questions and Answers
- 1.
Hidrazin dibentuk dengan cara mereaksikan gas nitrogen dengan hydrogen menurut persamaan reaksi berikut ….N2 (g) + H2(g) ----- N2H4 ( belum sama )Perbandingan volume N2 : H2 jika diukur pada suhu dan tekanan yang sama adalah ….
- A.
1 : 1
- B.
1 : 2
- C.
2 : 1
- D.
2 : 3
Correct Answer
B. 1 : 2Explanation
The correct answer is 1:2. This is because in the balanced chemical equation, the stoichiometric ratio between N2 and H2 is 1:2. This means that for every 1 mole of N2 gas, you need 2 moles of H2 gas to form N2H4 (hydrazine). Therefore, the volume ratio of N2 to H2 is also 1:2.Rate this question:
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- 2.
Berikut ini beberapa fenomena sehari-hari yang menunjukkan sifat koloid dalam kehidupan berikut :
- Proses cuci darah
- Kabut di pegunungan
- pembentukan delta dimuara sungai
- pemutihan gula
- A.
1
- B.
2
- C.
3
- D.
4
Correct Answer
C. 3 - 3.
Kemolalan larutan C2H5OH (Mr = 46) dengan persen berat 20% adalah ….
- A.
0,4
- B.
3,4
- C.
4,4
- D.
5,4
Correct Answer
D. 5,4Explanation
The correct answer is 5,4. This can be determined by calculating the molar mass of C2H5OH (46 g/mol) and then finding 20% of that mass. 20% of 46 g/mol is 9.2 g. Therefore, the molarity of the solution is 9.2 g/L. To convert this to a percentage, we divide 9.2 g/L by the density of C2H5OH (0.789 g/mL) and multiply by 100 to get 5.4%.Rate this question:
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- 4.
Volume larutan NaOH 0,25 M yang dibuat dengan melarutkan 1 gram NaOH adalah …. (Mr = 40)
- A.
50 mL
- B.
100 mL
- C.
125 mL
- D.
150 mL
Correct Answer
B. 100 mLExplanation
The molar mass of NaOH is 40 g/mol. To calculate the volume of a 0.25 M solution made by dissolving 1 gram of NaOH, we need to convert grams to moles. Since 1 gram is equal to 0.025 moles (1/40), we can use the formula Molarity = moles/volume to find the volume. Rearranging the formula, we get Volume = moles/Molarity. Plugging in the values, we get Volume = 0.025 moles / 0.25 M = 0.1 L = 100 mL. Therefore, the correct answer is 100 mL.Rate this question:
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- 5.
Suatu reaksi berada dalam keadaan setimbang apabila....
- A.
Reaksi tersebut sudah berhenti
- B.
Jumlah molekul ruas kiri = ruas kanan
- C.
Konsentrasi zat ruas kiri dan kanan sama
- D.
Laju reaksi ke kiri dan ke kanan sama
Correct Answer
D. Laju reaksi ke kiri dan ke kanan samaExplanation
The correct answer is "Laju reaksi ke kiri dan ke kanan sama". In a balanced reaction, the rate at which reactants are converted into products in the forward direction is equal to the rate at which products are converted back into reactants in the reverse direction. This means that the reaction is occurring at an equal rate in both directions, resulting in a state of equilibrium.Rate this question:
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- 6.
Suatu campuran gas-gas SO3, SO2, dan O2 yang berada dalam kesetimbangan dimampatkan pada suhu tetap.Akibat pemampatan ini ...
- A.
Jumlah SO3 bertambah
- B.
Jumlah SO2 bertambah
- C.
Jumlah O2 bertambah
- D.
Jumlah SO2 dan O2 bertambah
Correct Answer
A. Jumlah SO3 bertambahExplanation
When a gas mixture of SO3, SO2, and O2 is compressed at a constant temperature, the pressure of the system increases. According to Le Chatelier's principle, when the pressure of a system is increased, the equilibrium will shift in the direction that reduces the number of moles of gas. In this case, the number of moles of gas is reduced by increasing the amount of SO3, as it is the only gas in the mixture that can increase in quantity. Therefore, the correct answer is that the amount of SO3 increases.Rate this question:
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- 7.
Penggunaan suhu tinggi pada pembuatan amonia menurut proses Haber-Bosch adalah berdasarkan pertimbangan...
- A.
Agar reaksi bergeser ke kanan
- B.
Agar reaksi berlangsung cepat
- C.
Pada suhu rendah amonia sedikit terbentuk
- D.
Pembentukan amonia bersifat eksoterm
Correct Answer
B. Agar reaksi berlangsung cepatExplanation
The correct answer is "Agar reaksi berlangsung cepat". In the Haber-Bosch process, high temperatures are used to increase the rate of the reaction. Higher temperatures provide more energy to the reactant molecules, increasing their kinetic energy and the frequency of successful collisions. This leads to a faster reaction rate and a higher yield of ammonia.Rate this question:
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- 8.
Dalam suatu ruangan terdapat kesetimbangna antara 0,5 mol PCl5, 0,1 mol PCl3, dan 0,1 mol Cl2. Maka besarnya derajad disosiasi adalah....
- A.
1/9
- B.
1/6
- C.
1/4
- D.
1/2
Correct Answer
B. 1/6Explanation
The given question is asking for the degree of dissociation in a room where there is a balance between 0.5 mol PCl5, 0.1 mol PCl3, and 0.1 mol Cl2. The degree of dissociation is a measure of the extent to which a compound breaks down into its constituent elements. In this case, PCl5 dissociates into PCl3 and Cl2. The balanced equation for this reaction is PCl5 ⇌ PCl3 + Cl2. Since the initial moles of PCl5 is 0.5 and the final moles of PCl3 and Cl2 are both 0.1, it means that 0.4 mol of PCl5 has dissociated. Therefore, the degree of dissociation is 0.4/0.5 = 0.8, which is equivalent to 1/6.Rate this question:
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- 9.
Atom berasal dari kata atomos, yang artinya "a" adalah ... "tomos" adalah ...
- A.
A = tidak, tomos = memotong
- B.
A = dapat, tomos = padat
- C.
A = mungkin, tomos = memotong
- D.
A = bisa jadi, tomos = padat
Correct Answer
A. A = tidak, tomos = memotongExplanation
The word "atomos" comes from Greek, where "a" means "not" and "tomos" means "cut". Therefore, the correct answer is "a = tidak, tomos = memotong", which translates to "a = not, tomos = cut".Rate this question:
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- 10.
Berapakah Bilangan Oksidasi N dalam senyawa NH4OH+ (Ammonium hidroksida)
- A.
-1
- B.
0
- C.
-2
- D.
5
Correct Answer
C. -2Explanation
The correct answer is -2 because in NH4OH, the hydrogen atoms have a +1 oxidation state and the oxygen atom has a -2 oxidation state. Since the overall charge of the compound is 0, the nitrogen atom must have an oxidation state of -2 to balance out the positive charges.Rate this question:
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- 11.
Manakah yang bertindak sebagai reduktor pada reaksi redoks ini : H2 + SO4 --> H2SO4
- A.
O
- B.
H2
- C.
SO4
- D.
S
Correct Answer
B. H2Explanation
In the given redox reaction, H2 is acting as the reducing agent. This is because it is being oxidized, losing electrons, and causing the oxidation state of hydrogen to change from 0 to +1 in H2SO4. The sulfur in SO4 is being reduced, gaining electrons, and causing the oxidation state of sulfur to change from +6 to +4. Therefore, H2 is the species that is undergoing oxidation and is acting as the reducing agent in this reaction.Rate this question:
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- 12.
As2S3 adalah koloid hidrofob yang bermuatan negatif. Larutan yang paling baik untuk mengkoagulasikan koloid ini adalah ....
- A.
Kalium fosfat
- B.
Barium nitrat
- C.
Besi (III) klorida
- D.
Magnesium sulfat
Correct Answer
C. Besi (III) kloridaExplanation
Besi (III) klorida adalah larutan yang paling baik untuk mengkoagulasikan koloid As2S3 karena besi (III) klorida memiliki kemampuan untuk membentuk garam kompleks dengan ion negatif yang ada dalam koloid As2S3. Hal ini menyebabkan partikel-partikel koloid saling berikatan dan membentuk gumpalan yang lebih besar, sehingga mengkoagulasikan koloid tersebut.Rate this question:
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