The Problem of Colloids What is the meaning of colloidsWhat is the meaning of colloids

Milk is not colloidal – emulsion!

There should be a problem with the answer, choose AC, milk is also colloidal, and there is a colloidal section in the chemistry book.

Milk is not colloidal, and the molecules are too large compared to water molecules....Emulsion.

I remember that in chemistry, colloids have a range (the range of particle sizes inside), and I personally think that milk particles are smaller than colloids.

The solution learned in junior high school is actually one of the dispersion systems. Milk is a complex mixture of various dispersions. First of all, milk is a polymer colloid composed of protein particles and its hydrolysate, that is, various amino acids, and milk contains a small amount of lactose small molecule colloid, and also contains animal fats to form emulsions in water, and also contains a very small amount of inorganic salts to form a solution in water.

So milk is a mixture of various dispersions. In junior high school, ** milk is generally used as a turbidity, and in high school, it is often treated as a colloid.

Milk should be a cloudy emulsion! Because he won't have the Tyndall phenomenon! (See "College Entrance Examination Chemistry General Review").

Common colloids: 1. Smoke, clouds, and fog are aerosols, smoke quartz, colored glass are solid sols, protein solutions, and starch solutions are liquid sols;

2. Starch colloid, protein colloid is molecular colloid, soil is particle colloid;

Can biomacromolecules be considered colloids? It's obviously a suspension.

Colloids are defined as follows:

Colloidal Luzhou refers to a translucent mixture formed by the weak interaction of two or more substances at the micrometer or nano level, one of which is a solid or liquid particle (known as a dispersed phase) and the other is a liquid or solid (known as a dispersed medium).

1. Classification of colloids.

There are many ways to classify colloids, including dispersed phases (color, shape, and size), dispersion media (urea, glucose, substances containing ionic hydroxyl groups, etc.), colloidal stability (electrolytes, surface active limb agents, etc.), and application areas (food, pharmaceutical, etc.).

2. Reversibility of colloids.

The peculiarity of colloids lies in their reversibility, i.e. the aggregation or dispersion of particles can be caused by heating or cooling. This property allows colloids to play an important role in the field of science and technology, such as the preparation of sunlight protection agents, the improvement of soil properties, etc.

3. Optical properties of colloids.

The response of colloids to optics is different from that of crystals and liquids due to the scattering and absorption of light by the interaction of particles in colloids with light of comparable wavelengths. The optical properties of colloids are often used in the preparation of optical materials such as metal nanoparticle-supported photocatalysts and molecular sieves based on photonic crystals.

4. Dielectric properties of colloids.

When two liquids are mixed in a closed container, the colloids formed may have an electric charge, i.e., the surface potential is not zero. The charged state of solid particles in colloids can affect their properties such as arrangement, aggregation, and diffusion. This dielectric property has led to a wide range of applications in the fabrication of supercapacitors, liquid crystal displays, and nano-self-assembly.

5. Surface chemistry of colloids.

The interface between the solid particles and the dispersed medium in the colloid contains various interactions with each other, the most important of which are electrostatics and van der Waals forces. This surface chemistry determines the stability and aggregation state of the colloid. Therefore, understanding the surface chemistry of colloids is a very important step in the preparation of high-performance colloidal materials.

6. Morphological characteristics of colloids.

In colloids, colloidal materials exhibit a variety of structural and morphological characteristics due to the fact that the size and shape of the particles vary from the micrometer to the nanometer level, and the interactions between the particles are very complex. These morphological characteristics have an important impact on the mechanical, optoelectronic and thermal properties of materials.

The word for colloidal body is explained as: colloidal jiāotǐ. (1) A substance (such as gel, protein or starch) that, although soluble in water or other liquids, cannot diffuse through the membrane or is very slow, and shows some other properties (e.g., no significant effect on the freezing point or vapor pressure of the liquid).

The word for colloidal body is explained as: colloidal jiāotǐ. (1) A substance (such as gel, protein or starch) that, although soluble in water or other liquid of the jujube, cannot diffuse through the membrane or is very slow, and shows some other properties (such as no significant effect on the freezing point or vapor pressure of the liquid).

The phonetic pronunciation is: one by one. The pinyin is:

jiāotǐ。The structure is: glue (left and right structure) body (left and right structure).

What is the specific explanation of colloids, we will introduce it to you through the following aspects:

1. Online explanation [click here to view the details of the plan].

Colloid, also known as colloidal dispersion, is a relatively homogeneous mixture of slag compounds, which contains two different states of substances in the colloid, one dispersed phase and the other continuous phase. A part of the disperse is composed of tiny particles or droplets, and the dispersion system of the disperse particles with a diameter of 1 100 nm is colloidal; Colloids are a kind of dispersion systems with a diameter of dispersed particles between the coarse dispersion system and the solution, which is a highly dispersed multiphase heterogeneous system. The relevant knowledge of colloids can also be applied in wastewater treatment, and some pollutants in wastewater exist in the form of colloids, so many advanced sewage treatment equipment aims to study how to quickly and efficiently remove pollutants in colloidal form in wastewater.

Colloids don't have to be gelatinous and they don't have to be liquids. Such as: iron hydroxide colloid, clouds, fog, etc.

Idioms about colloids.

The rubber column drum is like glue, the paint is like paint, the ejiao luan glue, the phoenix silk glue paint is in harmony, the drum and the rubber column folds the glue, and the glue is disturbed by the glue.

Words about colloids.

Luan glue, phoenix silk glue column, drum and glue, fall fingers, like glue, glue paint, like glue, paint match, drum se, glue column, decoction, glue, continue strings, Chen Lei, glue paint, like glue, like paint, glue, the difficulty.

Sentence formation about colloids.

1. The on-site monitor explained that the more particles in the water contain suspended and colloidal particles, the higher its turbidity.

2. The results show that the change of the saturated permeability coefficient of bentonite is caused by the combined effect of the apparent porosity and the distance between the layers of the gelatinite montmorillonite.

3. Although the exfoliation gel is widely used, most of the polymer glue is added with cationic surfactant, because the colloid comes with anionism, and when it encounters cations, it will leak and precipitate, which makes everyone mistakenly think that it is old waste keratin.

4. The size of colloidal particles first changes from large to small, and then from small to large, and the relative content of calcium hydroxide in colloids is inversely proportional to the size of colloidal particles.

5. Objective: To observe the effect of pre-congested Dingan on the osmotic pressure of pre-filled colloids in cardiopulmonary bypass.

First, the nature of colloids.

The size of the dispersed particles in different dispersion systems is different, and the diameter of the colloidal particle dispersion (1-100 nm) is between the solution (1 nm) and the turbid liquid (100 nm), and the Tyndall effect can be used to distinguish the solution and the colloid.

The main reason why colloids can exist stably is that the same colloidal particles carry the same kind of charge, and the colloidal particles repel each other, and the colloidal particles cannot be aggregated into large particles and precipitate from the dispersant. The secondary reason is that the colloids are small and lightweight, and they are constantly in Brownian motion, which can overcome the sedimentation caused by gravity.

Generally speaking, the colloidal particles of metal hydroxides and metal oxides are positively charged, such as Fe(Oh)3 colloid, Al(Oh)3 colloid, AGX colloid (AgNO3 excess), etc.; The colloidal particles of non-metallic oxides, metal sulfides, such as silicate colloids, soil colloids, AS2S3 colloids, etc., are negatively charged. Colloidal particles can be charged, but the whole colloid must be electrically neutral. Whether the colloidal particles are charged or not depends on the properties of the colloids themselves, such as soluble starch dissolved in hot water to make colloids, which have colloidal properties, but the dispersions in the colloids are a single molecule of polymer compounds, which do not have an electric charge, so there is no electrophoresis phenomenon.

The methods of colloidal aggregation and precipitation are: adding electrolyte solution; add another colloid with the opposite charge to the particles; long-term heating, etc.

Colloids have a wide range of applications: they can improve the mechanical or optical properties of materials, such as tinted glass; It can be used to diagnose and treat diseases in medicine, such as hemodialysis; used in agriculture as a fertilizer for soil; alum purification and tofu making in daily life; It can also explain some natural phenomena, such as the formation of deltas at the mouth of rivers.

Colloidal precipitation and protein salting-out: Colloidal precipitation refers to the colloidal agglomeration into larger particles and sedimentation under appropriate conditions (factors that destroy colloidal stability), which is the property of liquid-repellent colloid, that is, the cohesion of colloidal is irreversible. Salting out refers to the process of adding concentrated inorganic light metal salts to the polymer solution (i.e., hydrophilic colloid) to precipitate the polymer from the solution, which is the property of the polymer solution or ordinary solution, and the salting out is because adding a large amount of salt will destroy the water film around the polymer dissolved in the water, weaken the interaction between the polymer and the dispersant, and reduce the solubility of the polymer and precipitate.

The dispersions where salting out occurs are all humiliating, so salting out is reversible. It can be seen that there is an essential difference between the aggregation and precipitation of colloids and the salting out of proteins.

Tyndall phenomenon [1] can occur, resulting in poly-sedimentation, electrophoresis, dialysis, adsorption and other properties.

Colloids are dispersed systems, which are a collection of some with the same or similar structure, and there are several particles to form a colloid, so when a substance of 1mol is generally formed, the number of colloidal particles (colloidal particles) is less than 1mol.

Explanation of colloids.

colloid]

A substance (e.g., gel, egg white, or polygonal powder), although soluble in water or other liquids, does not diffuse through membranes or is very slow, and exhibits other properties (e.g., no significant effect on the freezing point or vapor pressure of the liquid).

Word decomposition Explanation of glue Glue (glue) āviscous substance, made from the skin or horn of an animal, etc., and there are also plant secretions and synthetic substances: gum. Collagen.

Maw bladder glue. Latex. All-purpose glue.

Attached. Plywood. An elastic substance made from the secretions of the rubber tree:

Rubber. Rubbers. Rubber.

Tape. There is a sticky body of Xie Hui Dan Shi Ti (body) ǐ the whole body of a person or an animal: the body.

Weight. Body temperature. Physique.

Signs (abnormal changes that doctors find when examining a person). Physical. Physical appearance.

Physical fitness (physique and energy). Physical education. Pieces.

Part of the body: four bodies. Five-body casting.

The thing itself or all of it: the thing.

Definition: Dispersion systems with a diameter between 1 nanometer and 100 nanometers are called colloids.

Colloid, also known as colloidal dispersion Qingbei, is a homogeneous mixture in which two different states of substances are contained, one dispersed and the other continuously destroyed. The diameter of colloidal particles is generally between 1 nanometer and 100 nanometers, which determines that colloidal particles have a huge surface area and strong adsorption power, which can adsorb suspended solids or pigments in water to form precipitation, so as to purify water.

Definition: A dispersed system of dispersed particles between 1 nanometer and 100 nanometers in diameter.

It's called colloid. Colloids, also known as colloidal dispersions.

It is a homogeneous mixed focal-derived compound that contains two different states of substances in the colloid, one dispersed and the other continuous. The diameter of colloidal particles is generally between 1 nanometer and 100 nanometers, and it breaks and determines that colloidal particles have a huge positive surface area.

The adsorption power is very strong, and it can adsorb suspended solids or pigments in the water to form a precipitate, so that the water can be purified.

The dispersed system of dispersed particles with a diameter between 10 -9 m and 10 -7 m is called colloid.

Like solution and turbidity, colloids are a kind of dispersion system, and the size of solute particles forming colloids is about 10 7 to 10 9m, uniform, transparent and relatively stable.

The properties of colloids are electrophoresis, Tyndall phenomenon, and coagulation of colloids.

Electrophoresis refers to the placement of positive and negative electrodes in the colloid, in which the colloidal particles move in a directional direction (according to the charged nature of the colloidal particles themselves).

The Tyndall phenomenon refers to the fact that there is a clear pathway through the colloid, but not through other dispersions.

The gelatinized silver body itself is evenly dispersed in the solvent by charged particles, so when the electrolyte or dissimilar charge colloid is put in, it will condense and precipitate due to the attraction of the charge.

Problem solving ideas: a colloidal particle is a certain number of particles;

b Starch solution is colloidal;

c "Rainbow after rain" is related to colloidal sources, and "mirage" is not related to colloidal properties;

d "Nanomaterials" refer to materials with particles ranging from a few nanometers to tens of meters in diameter

A colloidal particles are the ** body of a certain number of particles, and in the colloidal dissolved in 1mol Fe(OH)3, the number of colloidal particles is less than na, so A is correct;

b The starch solution is colloidal, with Tyndall effect, and it is correct to contain b;

c "Rainbow after rain" belongs to the scattering of light, "mirage" belongs to the refraction of light, "rainbow after rain" is related to colloid, "mirage" has nothing to do with colloidal properties, so C is correct;

d "Nanomaterial" refers to a material with a particle diameter of a few nanometers to tens of meters, not a dispersion system, and colloids are a dispersion system, so d is wrong

Therefore, d 1 is chosen, and the following understanding of colloids is wrong ( ).

a In the colloids dissolved in 1mol Fe(OH)3, the number of colloidal particles containing is less than n a.

b Passing a beam of bright light through a starch solution can also produce the Tyndall effect.

c "Rainbow after rain" and "mirage" are both natural and optical phenomena, and are also related to the knowledge of colloids.

d Nanomaterials are generally from a few nanometers to tens of nanometers between the particles, so nanomaterials belong to colloids.