Kuis Online Kimia Unsur
Questions and Answers
- 1.
Perhatikan tabel sifat-sifat fisika unsur golongan alkali:SifatLiNaKRbKonfigurasi elektronEnergi ionisai, kJ/molKerapatan, g/cm3Jari-jari ion, ÅPotensial reduksi, Eo[He]2s15200,531,0-3,05[Ne]3s15000,970,9-2,71[Ar] 4s14200,860,8-2,93[Kr] 5s14001,530,8-2,92Berdasarkan data di atas, kereaktifan unsur golongan alkali dipengaruhi oleh …
- A.
A. konfigurasi elektron
- B.
B. energi ionisasi
- C.
C. Jari-jari atom
- D.
D. kerapatan
- E.
E. Potensial reduksi standar, Eo
Correct Answer
B. B. energi ionisasiExplanation
Based on the data provided in the table, the reactivity of alkali group elements is influenced by their ionization energy. Ionization energy is the energy required to remove an electron from an atom or ion. The higher the ionization energy, the more difficult it is to remove an electron, and therefore, the less reactive the element is. In this case, the alkali group elements have decreasing ionization energies from Li to Rb, indicating that their reactivity increases as the ionization energy decreases. Therefore, the correct answer is b. energy ionization.Rate this question:
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- 2.
Berdasarkan tes nyala terhadap logam alkali, diperoleh warna ungu. Unsur tersebut adalah …
- A.
A. Li
- B.
B. Na
- C.
C. K
- D.
D. Rb
- E.
E. Cs
Correct Answer
C. C. KExplanation
Based on the given information that the metal alkali produces a purple color in the flame test, the correct answer is c. K (potassium).Rate this question:
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- 3.
Elektrolisis larutan yang menghasilkan logam alkali adalah …
- A.
A. leburan KCl dengan elektroda Pt
- B.
B. larutan KI dengan elektroda C
- C.
C. larutan Na2SO4 dengan elektroda C
- D.
D. larutan KNO3 dengan elektroda Au
- E.
E. larutan Na3PO4 dengan elektroda C
Correct Answer
A. A. leburan KCl dengan elektroda PtExplanation
The correct answer is a. leburan KCl dengan elektroda Pt. This is because KCl is an ionic compound that can be electrolyzed to produce the alkali metal potassium (K). The use of a platinum (Pt) electrode is suitable for this electrolysis process.Rate this question:
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- 4.
Bahan baku pembuatan Na2CO3 melalui proses solvay adalah …
- A.
A. NaCl, NH3, CO
- B.
B. NaOH, NH3, CO2
- C.
C. NaHCO3, NaCl
- D.
D. NaCl, CO2, NH3
- E.
E. NaOH, NaCl, CO2
Correct Answer
D. D. NaCl, CO2, NH3Explanation
The correct answer is d. NaCl, CO2, NH3. This is because the Solvay process for the production of Na2CO3 involves the reaction of NaCl (sodium chloride) with CO2 (carbon dioxide) and NH3 (ammonia). These reactants undergo a series of chemical reactions to produce sodium carbonate (Na2CO3). Therefore, the correct combination of raw materials for the Solvay process is NaCl, CO2, and NH3.Rate this question:
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- 5.
Logam alkali tanah yang tidak menghasilkan gas hidrogen jika bereaksi dengan air adalah …
- A.
A. Ba
- B.
B. Sr
- C.
C. Mg
- D.
D. Ca
- E.
E. Be
Correct Answer
E. E. BeExplanation
Beryllium (Be) is an alkaline earth metal that does not produce hydrogen gas when it reacts with water. This is because beryllium has a very low reactivity with water compared to other alkaline earth metals. When beryllium reacts with water, it forms beryllium hydroxide (Be(OH)2) and hydrogen gas is not produced. In contrast, other alkaline earth metals such as calcium (Ca), magnesium (Mg), strontium (Sr), and barium (Ba) are more reactive and will produce hydrogen gas when they react with water.Rate this question:
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- 6.
Basa alkali tanah yang paling mudah larut dan mempunyai sifat basa kuat adalah …
- A.
A Be(OH)2
- B.
B Mg(OH)2
- C.
C Ca(OH)2
- D.
D Sr(OH)2
- E.
E Ba(OH)2
Correct Answer
E. E Ba(OH)2Explanation
Basa alkali tanah yang paling mudah larut dan memiliki sifat basa kuat adalah Ba(OH)2. Basa alkali tanah umumnya larut dalam air, namun Ba(OH)2 memiliki kelarutan yang lebih tinggi dibandingkan dengan basa alkali tanah lainnya. Selain itu, Ba(OH)2 juga memiliki sifat basa kuat, yang berarti bahwa ia dapat menghasilkan ion hidroksida (OH-) dengan mudah ketika berada dalam larutan air. Hal ini membuat Ba(OH)2 memiliki kemampuan yang kuat untuk membentuk larutan basa dan mengalami disosiasi yang lengkap dalam air.Rate this question:
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- 7.
Pembakaran logam Mg di udara, selain terbentuk MgO juga terbentuk zat X. Zat ini jika ditambah air dapat membirukan lakmus, zat itu adalah …
- A.
A Mg(OH)2
- B.
B Mg3N2
- C.
C MgCO3
- D.
D Mg(HCO3)2
- E.
E Mg(CN)2
Correct Answer
B. B Mg3N2Explanation
When magnesium (Mg) is burned in air, it reacts with nitrogen (N2) to form magnesium nitride (Mg3N2). This is the compound represented by "zat X" in the question. When Mg3N2 is added to water, it reacts to produce ammonia (NH3) and magnesium hydroxide (Mg(OH)2). The formation of ammonia explains why "zat X" can turn litmus paper blue, indicating it is a base. Therefore, the correct answer is b) Mg3N2.Rate this question:
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- 8.
Diantara unsur alkali tanah berikut yang bersifat ampoter adalah …
- A.
A. Mg
- B.
B. Be
- C.
C. Ra
- D.
D. Ca
- E.
E. Sr
Correct Answer
B. B. BeExplanation
Beryllium (Be) is the correct answer because it is an amphoteric element. This means that it can act as both an acid and a base. It reacts with both acids and bases to form salts. The other elements listed, magnesium (Mg), calcium (Ca), strontium (Sr), and radium (Ra), are not amphoteric and do not exhibit this property.Rate this question:
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- 9.
Berdasarkan tes nyala terhadap logam alkali tanah dihasilkan warna putih terang. Logam itu adalah …
- A.
A. Be
- B.
B. Mg
- C.
C. Ca
- D.
D. Ra
- E.
E. Sr
Correct Answer
B. B. MgExplanation
The bright white color produced during the flame test indicates the presence of magnesium (Mg). Alkali earth metals, such as magnesium, have characteristic flame colors when they are heated. Magnesium emits a bright white light when it is heated, which is why it is the correct answer for this question.Rate this question:
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- 10.
Pembuatan unsur-unsur logam alkali tanah umumnya dilakukan melalui proses …
- A.
A. Pirolisis
- B.
B. elektrolisis
- C.
C. kromatografi
- D.
D. peptisasi
- E.
E. pemanggangan
Correct Answer
B. B. elektrolisisExplanation
The correct answer is b. elektrolisis. The process of making alkaline earth metals is commonly done through elektrolisis.Rate this question:
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Mar 20, 2023Quiz Edited by
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Dec 14, 2017Quiz Created by
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