Soal Latihan Kimia Kelas 9 Smp

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Soal Latihan Kimia Kelas 9 Smp - Quiz

PILIHLAH JAWABAN YANG PALING TEPAT !


Questions and Answers
  • 1. 

    BERIKUT YANG TERMASUK UNSUR ADALAH.....

    • A.

      Hg, Ag, Pb, Au

    • B.

      HCl, NaOH, H

    • C.

      Cl2, H2, Br2

    • D.

      Uuh, Uuo, H2O

    Correct Answer
    A. Hg, Ag, Pb, Au
    Explanation
    The elements Hg, Ag, Pb, and Au are included in the answer because they are all examples of chemical elements. These elements are represented by their respective symbols on the periodic table. Hg represents mercury, Ag represents silver, Pb represents lead, and Au represents gold.

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  • 2. 

    berikut yang termasuk senyawa adalah .... kecuali

    • A.

      NaCl, HI, HBr

    • B.

      Na, H2O, N2

    • C.

      H, Li, Uuh

    • D.

      KCl, HNO3, Uuo

    Correct Answer
    C. H, Li, Uuh
    Explanation
    The given answer is correct because H, Li, and Uuh are elements, not compounds. Compounds are formed when two or more elements chemically combine, whereas elements are pure substances that cannot be broken down into simpler substances. NaCl, HI, HBr, H2O, N2, KCl, HNO3, and Uuo are all compounds because they consist of two or more elements chemically bonded together.

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  • 3. 

    Senyawa yang tersusun oleh unsur-unsur sejenis disebut ...

    • A.

      Senyawa ion

    • B.

      Senyawa amfoter

    • C.

      Senyawa diatomik

    • D.

      Senyawa monoatomik

    Correct Answer
    D. Senyawa monoatomik
    Explanation
    Senyawa yang tersusun oleh unsur-unsur sejenis disebut senyawa monoatomik. Monoatomik berarti terdiri dari satu atom. Dalam senyawa ini, hanya terdapat satu jenis unsur yang membentuk senyawa tersebut. Contohnya adalah gas mulia seperti helium (He), neon (Ne), dan argon (Ar), yang merupakan senyawa monoatomik karena terdiri dari satu jenis atom.

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  • 4. 

     Berikut terdapat beberapa zat : 1. air gula 2. es krim 3. kabut 4. asap 5. air sirup 6. teh yang termasuk koloid adalah ....

    • A.

      1,2,3

    • B.

      2,3,4

    • C.

      3,4,6

    • D.

      1,5,6

    Correct Answer
    B. 2,3,4
    Explanation
    The substances listed in options 2, 3, and 4 (es krim, kabut, asap) are examples of colloids. Colloids are mixtures where one substance is dispersed evenly throughout another substance, creating a stable suspension. In the case of es krim (ice cream), it is a colloid because small ice crystals are dispersed throughout a mixture of milk, sugar, and flavorings. Kabut (mist) and asap (smoke) are also colloids because they consist of small liquid or solid particles dispersed in a gas. Therefore, options 2, 3, and 4 are the correct answer as they contain substances that are examples of colloids.

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  • 5. 

    nomor massa dalam sistem periodik berkala unsur (SPBU) menyatakan ....

    • A.

      Jumlah neutron

    • B.

      Jumlah proton

    • C.

      Jumlah elektron

    • D.

      Jumlah proton dan neutron

    Correct Answer
    D. Jumlah proton dan neutron
    Explanation
    The mass number in the periodic table of elements represents the total number of protons and neutrons in the nucleus of an atom. It does not include the number of electrons, as they are found in the electron cloud surrounding the nucleus. Therefore, the mass number indicates the sum of protons and neutrons in an atom.

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  • 6. 

    Gerak acak partikel koloid disebut …

    • A.

      Gerak brown

    • B.

      Efek tyndall

    • C.

      Gerak partikel

    • D.

      Koagulasi

    Correct Answer
    A. Gerak brown
    Explanation
    The correct answer is "Gerak brown". This refers to the random movement of colloidal particles in a fluid medium due to the collision with molecules of the medium. This movement is named after the botanist Robert Brown, who first observed this phenomenon in 1827. The Brownian motion is an essential characteristic of colloidal systems and plays a significant role in various natural and industrial processes.

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  • 7. 

    Peristiwa pengendapan partikel-partikel koloid sehingga fase terdispersinya terpisah dari medium pendispersinya disebut …

    • A.

      Gerak brown

    • B.

      Koagulasi

    • C.

      Elektroforesis

    • D.

      Adsorpsi

    Correct Answer
    B. Koagulasi
    Explanation
    Koagulasi adalah peristiwa pengendapan partikel-partikel koloid sehingga fase terdispersinya terpisah dari medium pendispersinya. Hal ini terjadi ketika partikel-partikel koloid saling berinteraksi dan membentuk agregat yang lebih besar sehingga terjadi pemisahan antara partikel koloid dan medium pendispersinya. Gerak brown adalah gerakan acak partikel-partikel koloid, elektroforesis adalah pergerakan partikel-partikel koloid dalam medan listrik, dan adsorpsi adalah penyerapan partikel-partikel koloid oleh permukaan zat lain.

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  • 8. 

    Zat campuran yang terlihat serbasama, tidak keruh, dan tidak ada endapan disebut.... contohnya ...

    • A.

      Koloid, air garam

    • B.

      Larutan, es krem

    • C.

      Larutan, air gula

    • D.

      Suspensi, air garam

    Correct Answer
    C. Larutan, air gula
    Explanation
    Larutan air gula adalah zat campuran yang terlihat serbasama, tidak keruh, dan tidak ada endapan. Hal ini dikarenakan gula dapat larut dengan baik dalam air, sehingga tidak terbentuk endapan dan tidak membuat larutan menjadi keruh. Contoh dari larutan air gula adalah minuman teh manis atau sirup gula yang larut dalam air.

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  • 9. 

    Proses penjernihan air dengan menggunakan tawas, penyembuhan sakit perut dengan norit, termasuk pemanfaatan dari sifat koloid yaitu ...

    • A.

      Adsorpsi

    • B.

      Elektroforesis

    • C.

      Koagulasi

    • D.

      Dialisis

    Correct Answer
    A. Adsorpsi
    Explanation
    The correct answer is adsorpsi. Adsorpsi is the process of attachment or adhesion of particles or molecules to the surface of a solid or liquid. In the given examples, the use of tawas in water purification and norit in treating stomach ache involves the adsorption of impurities or toxins onto the surface of these substances, effectively removing them from the water or digestive system. This demonstrates the utilization of the colloid property of adsorption in these processes.

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  • 10. 

    Zat yang digunakan sebagai koloid pelindung pada es krem adalah ...

    • A.

      Gelatin

    • B.

      Susu

    • C.

      Zat warna

    • D.

      Zat aditif

    Correct Answer
    A. Gelatin
    Explanation
    Gelatin is used as a protective colloid in ice cream. It helps to stabilize the ice cream mixture by preventing the formation of large ice crystals and maintaining a smooth and creamy texture. Gelatin also helps to improve the mouthfeel and prevent melting too quickly.

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  • 11. 

    Proses pencucian darah merupakan salah satu contoh yang menerapkan sifat koloid yaitu ...

    • A.

      Koagulasi

    • B.

      Koloid pelindung

    • C.

      Elektroforesis

    • D.

      Dialisis

    Correct Answer
    D. Dialisis
    Explanation
    Dialisis adalah salah satu contoh proses pencucian darah yang menerapkan sifat koloid. Pada dialisis, darah yang terkontaminasi dengan zat-zat berbahaya atau limbah diolah melalui membran semipermeabel untuk memisahkan zat-zat tersebut dari darah. Proses ini menggunakan perbedaan konsentrasi dan tekanan untuk memisahkan partikel-partikel koloid dari larutan. Oleh karena itu, dialisis merupakan contoh yang tepat untuk menjelaskan sifat koloid dalam proses pencucian darah.

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  • 12. 

    Salah satu contoh terjadinya efek tyndall dalam kehidupan sehari-hari adalah ...

    • A.

      Sorot lampu mobil di jalan yang berkabut dan berasap

    • B.

      Pengurangan zat-zat pencemar udara

    • C.

      Pembentukan delta di muara

    • D.

      Pewarnaan kain tekstil

    Correct Answer
    A. Sorot lampu mobil di jalan yang berkabut dan berasap
    Explanation
    The correct answer is "sorot lampu mobil di jalan yang berkabut dan berasap" because when the headlights of a car shine through fog or smoke, the light is scattered by the suspended particles in the air. This scattering of light is known as the Tyndall effect, which causes the light to become visible and appear as a beam or glow.

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  • 13. 

    Berikut unsur-unsur yang terletak pada golongan IIA adalah ....

    • A.

      Li, Na, K, Rb, Cs, Fr

    • B.

      Be, Mg, Ca, Sr, Ba, Ra

    • C.

      He, Ne, Ar, Kr, Xe, Rn

    • D.

      F, Cl, Br, I, At

    Correct Answer
    B. Be, Mg, Ca, Sr, Ba, Ra
    Explanation
    The elements Be, Mg, Ca, Sr, Ba, and Ra belong to Group IIA of the periodic table. This group is known as the alkaline earth metals. These elements have two valence electrons and tend to form 2+ cations. They are all metals and have similar chemical properties, such as high reactivity with water and the ability to form basic oxides.

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  • 14. 

    Semua unsur logam dalam golongan transisi memiliki wujud padat (solid), kecuali ...

    • A.

      Ag

    • B.

      Pt

    • C.

      Hg

    • D.

      Cd

    Correct Answer
    C. Hg
    Explanation
    All the elements in the transition metal group are solid except for Hg (Mercury). This is because Mercury has a unique property of being a liquid at room temperature. It has a low melting point and boiling point compared to other transition metals, which allows it to exist as a liquid rather than a solid.

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  • 15. 

    Unsur berikut yang termasuk golongan gas mulia adalah ...kecuali

    • A.

      Argon

    • B.

      Neon

    • C.

      Kripton

    • D.

      Astatin

    Correct Answer
    D. Astatin
    Explanation
    The given question asks for the noble gases among the options provided, except for one. The noble gases are a group of elements that are very stable and have a full outer electron shell. Argon, neon, and krypton are all noble gases. Astatine, on the other hand, is not a noble gas. It is a halogen and belongs to a different group on the periodic table. Therefore, the correct answer is Astatin.

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