Soal Koloid Kelas Xi Mia/Iis

When oil and water are mixed, they typically do not form a homogeneous mixture and instead separate into distinct layers. However, adding soap to the mixture can help create an emulsion. Soap molecules have a hydrophilic (water-loving) head and a hydrophobic (water-repelling) tail. The hydrophobic tails of the soap molecules surround the oil droplets, while the hydrophilic heads face outward towards the water. This arrangement allows the oil and water to mix more evenly and form a stable emulsion. Therefore, adding soap to the oil and water mixture can help create a homogeneous mixture, explaining why the correct answer is "Air sabun" (soapy water).

The correct answer is "Terjadinya delta di muara sungai". Coagulation is the process of particles coming together to form larger clumps or aggregates. In the context of the given options, the formation of a delta at the mouth of a river involves the deposition of sediment particles that come together and settle, which can be considered a form of coagulation. This is why the correct answer is "Terjadinya delta di muara sungai".

Norit, which is an activated charcoal, is used to absorb toxins in patients who have food poisoning. The process of toxin absorption is a characteristic of colloid, specifically adsorption.

The given statement "Kuningan adalah campuran logam, yang merupakan koloid zat dispersi" translates to "Brass is a mixture of metals, which is a colloidal dispersion." This implies that brass is a solid (padat) dispersed in another solid (padat), making the answer "Padat dalam padat" the correct choice.

The substances that are classified as sol liofil (soluble in water) are agar-agar, lem kanji, and busa sabun. These substances have the ability to dissolve in water, forming a homogeneous solution.

The correct answer is "gas terdispersi dalam zat cair". This means that the dispersion system consists of gas dispersed in a liquid.

The given question states that after filtering, the river water obtained is clear but still shows the Tyndall effect. This indicates that the filtrate contains particles that are small enough to scatter light, which is a characteristic of colloids. Therefore, the correct answer is colloid.

Koloid hidrofob terjadi apabila zat pendispersinya air. Lemak adalah salah satu zat yang tidak larut dalam air dan cenderung mengelompok menjadi partikel-partikel kecil yang tersebar di dalam air. Oleh karena itu, lemak dalam air merupakan contoh koloid hidrofob.

The correct answer is (3) dan (4) because the process of condensation is involved in both options. In option (3), FeCl3 is added to boiling water, which causes the formation of Fe(OH)3 colloidal particles through the process of condensation. In option (4), agar-agar is dispersed in water and then heated, causing the agar-agar molecules to break down and form colloidal particles through the process of condensation. Both of these processes involve the aggregation of smaller particles to form larger colloidal particles, which is characteristic of the condensation method of colloid formation.

The correct answer is (5) Pemutihan gula tebu. Adsorption is the process in which particles or molecules adhere to the surface of a solid or a liquid. In this case, the impurities in the sugar cane juice adhere to the surface of a solid material, such as activated charcoal, in order to remove them and purify the sugar cane juice. This process is an example of adsorption.

The correct answer is "Asap" because smoke is a colloidal system where solid particles are dispersed in a gas medium. The solid particles in smoke are small and can stay suspended in the air for a long time due to their small size, making it a solid-gas colloidal system.

The correct answer is 2 dan 3. The explanation for this is that the examples given, batu apung (pumice stone), asap (smoke), kabut (fog), buih (foam), and spons busa (sponge), are all examples of colloids with dispersed phase in the form of solid, liquid, or gel. Gas is not mentioned in any of the examples, so options 2 and 3 are the correct answer.

Gerak Brown terjadi karena tumbukan molekul medium dengan partikel koloid. Ketika partikel koloid bergerak di dalam medium, mereka akan mengalami tumbukan dengan molekul-molekul medium tersebut. Tumbukan ini menyebabkan partikel koloid bergerak secara acak dan tidak teratur, yang dikenal sebagai gerak Brown.

The correct answer is 3 and 1. The process of removing body odor using MBK powder involves the property of adsorption, which is a characteristic of colloids. Dialysis, on the other hand, is a process that separates colloids from crystalloids, and is not directly related to the given scenario. Therefore, options 1 and 3 are the correct choices.

The correct answer is (2) dan (3). The process of making a colloid by condensation involves the combination of small particles to form larger particles. In option (2), FeCl3 solution is added to boiling water, causing the formation of Fe(OH)3 colloidal particles. In option (3), AgNO3 solution is added to NaCl solution, resulting in the formation of AgCl colloidal particles. Both of these processes involve the condensation of small particles to form colloidal particles, making (2) dan (3) the correct answer.

Sol liofob memiliki efek Tyndall yang lebih jelas dibandingkan dengan sol liofil. Efek Tyndall adalah fenomena di mana partikel-partikel terdispersi dalam suatu medium menyebar cahaya dan menghasilkan cahaya yang terlihat. Pada sol liofob, partikel-partikel terdispersi tidak suka pada zat pendispersi sehingga cenderung membentuk agregat atau gumpalan yang lebih besar. Ketika cahaya melewati sol liofob, partikel-partikel ini menyebabkan penyebaran cahaya yang lebih jelas dan terlihat dengan lebih jelas dibandingkan dengan sol liofil.

Tawas digunakan dalam pengolahan air PAM untuk menjernihkan air melalui proses koagulasi. Koagulasi adalah proses penggumpalan partikel-partikel kecil dalam air menjadi partikel yang lebih besar yang dapat dengan mudah diendapkan atau disaring. Tawas memiliki sifat yang memungkinkannya untuk membentuk flok yang dapat mengikat partikel-partikel kecil dalam air, sehingga membantu dalam proses pengendapan dan penyaringan air.

Aluminium hidroksida membentuk sol bermuatan positif dalam air. Untuk menggumpalkan koloid, diperlukan elektrolit yang memiliki ion bermuatan negatif yang dapat menetralkan muatan positif pada koloid. Dalam hal ini, Na3PO4 adalah elektrolit yang paling efektif karena memiliki 3 ion fosfat (PO4)3- yang dapat menetralkan muatan positif pada aluminium hidroksida, sehingga menggumpalkan koloid tersebut.

Dialysis is the process of removing excess electrolytes from a colloid dispersion. It involves the separation of particles based on their size and charge using a semipermeable membrane. The colloid dispersion is placed in a dialysis bag or tube, and then immersed in a solution with lower electrolyte concentration. The smaller electrolyte particles pass through the membrane, while the larger colloidal particles remain inside the bag. This process helps to purify the colloid dispersion by reducing the concentration of electrolytes present.

The correct answer is "Sol". Sol refers to a dispersion of solid particles in a liquid. In this case, the question is asking for the term used to describe the dispersion of liquid particles in a gas. Since none of the other options (emulsion, foam, liquid aerosol, suspension) fit this description, the correct answer must be sol.