Does everything dissolved in water precipitate out when water freezes?

Cooling from the beginning of the solution will certainly pass through the solid-liquid two-phase zone, at which point something will definitely precipitate, either water (freezing) or solute (solubility.

Drop ), either hormones form complexes from them. There are many types of solid-liquid phase equilibrium, and many binary alloys form a wide variety of solid solutions.

solid solution), solid multiphase systems, or formed compounds. Kinetic factors will play an important role in the solid-liquid equilibrium, phase diagram.

It is difficult to be accurate, so the research in this area is mainly metallurgical research, and there are not many studies on water systems. However, in general, the water-solute system is not prone to the formation of solid solutions, so it will precipitate after cooling and freezing (note that the solid crystalline is two phases, and the solute still precipitates).

In both systems, the solid phase contains water and solute-forming compounds. If the slow cooling of the components is controlled, it is possible to obtain a single, homogeneous crystal.

The H2O(S)+ region is where ice and solution coexist, and C12H22O11(S) is sucrose.

Coexist with the solution. A large area underneath – Crystalline Phase H2O(S) +C12H22O11(S) – is a mixture of ice and sucrose. But didn't I say that solid-liquid balance is heavily affected by kinetics?

In a water-sucrose system, if you cool it directly, you will likely get a glassy solid, which is the result of the sucrose-water system not having time to form neat crystals. **The glass phase area in the lower right corner of the center shows the metastable range of the glass state. Solid water (ice) is a typical hydrogen-bonded crystal and is a water molecule.

A grid-like structure is formed, which makes it difficult to form a solid solution (unlike alloys). But it is still possible to form an inclusion complex. Famous combustible ice.

It is a cladding complex formed by methane and water, but it is synthesized in a high-pressure phase and cannot be regarded as cooling precipitation. <>

When the temperature drops from room temperature to 0 degrees, the solubility of most substances decreases as the temperature decreases, so some substances precipitate before freezing.

The water that dissolves other substances is no longer pure water, so its melting point will change accordingly, mostly decreasing, therefore, the temperature of the solution will slowly precipitate some substances in the process of dropping to the melting point, but the solute in the solution is not completely precipitated.

When the temperature drops below the melting point of the solution, it begins to freeze, that is, the solution freezes, and the solute is still in the solution, but the solution has become a solid state. For example, the sugar water that dissolves the pigment is frozen into a popsicle.

Broadly speaking, the solvent in the solution does not necessarily need to be liquid or water, the solvent can also be a gas or a solid, in this case ice. <>

That is to be divided into gases, liquids, dissolution of solids. And these three categories can be divided into two categories: gases and solids are a group, and liquids are a group.

Gases and solids can generally be dissolved in water, it's just a matter of how much! But it can't be dissolved indefinitely. Such as:

NACI (table salt) has its solubility in water, and when it exceeds a certain amount, it cannot be dissolved. And gases (such as oxygen and other gases) have a similar situationSome liquids are the same as gaseous solids, but the reason why they are separated is because some liquids can be dissolved indefinitely.

But it is not strictly said that it is pulled when it dissolves in water, but that water is dissolved in it and pulled. For example, ethanol (alcohol) can be dissolved in water indefinitely!

Solubility is, of course, also related to dissolution. <>

Water freezes and turns from a liquid into a solid, a process called solidification. The change of matter from a liquid state to a solid state is called solidification. Exothermic during solidification.

Like melting, crystals have a certain solidification temperature, which is called the freezing point.

The heat dissipation temperature of the crystal decreases, and it begins to solidify when it reaches the freezing point, and the temperature remains unchanged during solidification. After the crystals have completely solidified into a solid, the temperature continues to drop. During the solidification process, the crystal is in a state of coexistence of solid and liquid.

Amorphous do not have a certain solidification temperature. The solidification process of amorphous crystals is similar to that of crystals, except that the temperature continues to rise during solidification, which requires continuous heat absorption and release.

Water becomes ice called solidification, water water vapor (evaporation) ice water vapor (sublimation) ice water (melting) water ice (solidification) water vapor water (condensation) water vapor

It's water, ice and water are just different forms of the same substance, water.

Ice is a crystallization formed by the orderly arrangement of water molecules, which are joined together by hydrogen bonds to form a very "open" (low-density) rigid structure. The spacing between the O—O nuclei closest to the water molecule is that the O—O—O bond angle is about 109 degrees, which is very close to the bond angle of an ideal tetrahedron of 109 degrees 28 minutes. However, the O-o spacing of each water molecule that is only adjacent and not directly bound is much larger, and the farthest is reached.

From a molecular point of view, there is no change in the water molecules after the water freezes. However, in terms of physical properties, it is already ice, and it is a substance that is different from the form of liquid water in the three-state change of water, mainly manifested as low temperature, solid, hard, and transparent crystals.

Water freezing is a physical change, so water freezing is still water, but the liquid becomes solid water.

Yes, the freezing of water is only a change in the form of existence, but not a fundamental change in its nature.

From a scientific point of view, it's still water. Water freezes, but there is only a physical change, and its chemical composition and molecular structure are unchanged, and it is still H2O. Water turns into ice because the structure between molecules and molecules is changed at low temperatures, and the matter itself does not change.

Not water but ice. Ice becomes smaller in volume and lighter in weight than water.

Water is one of the most special substances, generally objects are cold shrinkage and heat rise, and water cold also rises, heat also rises, only at 4 degrees Celsius the volume is the smallest, when the volume increases by 1 11 when it freezes, and when the ice melts and shrinks by 1 11 .........

When water freezes, the volume increases by 19, and when the water freezes into ice, the volume becomes fractions?

A supersaturated solution made from a crystalline substance such as sodium acetate or sodium carbonate.

The supersaturated solution cooled by sodium acetate can exist normally when there is no external force. Answer: Once subjected to friction, obvious vibration, or external force, needle-like crystals will immediately appear. It looks as if the liquid freezes instantly.

Supersaturated solutions are unstable, and if the solution is stirred, vibrating, rubbing against the walls of the vessel, or by throwing solid "seeds" into the solution, the excess solute in the solution will immediately crystallize and precipitate. After crystallization, the remaining mother liquor is a saturated solution in equilibrium with the solute crystals.

If it is a knot that is copied at a relatively low normal temperature.

If you attack the crystal, bai as long as the temperature can.

du reaches the freezing point of the water.

Zhi chemicals such as liquid nitrogen can freeze water.

Liquid nitrogen is inert, colorless, odorless, non-corrosive, non-flammable, and has extremely low temperatures. Nitrogen makes up the majority of the atmosphere (volume ratio, weight ratio. Nitrogen is inactive and does not support combustion; But nitrogen is an essential element for sustaining life.

If it freezes at an abnormal temperature, it is used to drink water and form crystalline water after contact with the modified chemical, which makes people think that it is a water crystal. For example, a supersaturated solution of sodium acetate.

Sodium acetate generally exists in the form of sodium acetate trihydrate with three crystalline waters. Sodium acetate trihydrate is a colorless transparent or white particle crystal, which can be weathered in the air and is flammable. Soluble in water, slightly soluble in ethanol, insoluble in ether.

123 when losing crystal water. However, usually the wet method has a taste of acetic acid. Hydrolysis occurs in water.

As long as it is soluble in water and endothermic substances, such as ammonium nitrate, it is possible.

The process of mixing more than two or more substances into a homogeneous phase in a molecular state is called dissolution. Whereas, dissolution in the narrow sense refers to the process by which a liquid produces a chemical reaction with a solid, liquid or gas to make it a homogeneous phase in the molecular state, which is called dissolution. The process by which one substance (solute) is dispersed in another substance (solvent) to become a solution.

For example, table salt or sucrose is dissolved in water to form an aqueous solution. A solution is not necessarily a liquid, it can be a solid, a liquid, a gas. For example, a homogeneous alloy and air can be called a solution.

When two substances are miscible with each other, the substance with the highest mass is generally called a solvent (if there is water in it, it is generally customary to call water a solvent).

Substances are dissolved in water and usually go through two processes: one is the diffusion process of solute molecules (or ions), which is a physical process that requires the absorption of heat; The other is the process of forming solvent (hydration) molecules (or hydrated ions) by the interaction of solute molecules (or ions) and solvent (water) molecules, which is a chemical process that emits heat. When the heat released is greater than the heat absorbed, the temperature of the solution will increase, such as concentrated sulfuric acid, sodium hydroxide, etc.; When the heat released is less than the heat absorbed, the temperature of the solution will decrease, such as ammonium nitrate, etc.; When the heat emitted is equal to the heat absorbed, the temperature of the solution does not change, such as sodium chloride, sucrose, etc.

The dissolution process of substances is often accompanied by some important appearance phenomena, such as accompanied by thermal effects: such as NH4NO3, NH4Cl, KNo3, NH4HCO3, etc., which are dissolved in water, are often accompanied by endothermic phenomena. Dilution of concentrated sulfuric acid, NaOH, anhydrous CuSO4, Ca(OH)2, anhydrous Na2CO3, etc. are often accompanied by exothermic phenomena when dissolved in water.

There is no obvious thermal effect when diluted concentrated phosphoric acid, NaCl, CuSO4·5H2O, etc. are dissolved in water. With color change: white anhydrous CuSO4 powder is dissolved in water, and the solution formed is light blue.

Blue CoCl2 dissolves in water and forms a solution that is pink in color. Accompanying volume change: The volume of the mixed solution formed after benzene mixed with acetic acid is often greater than the sum of the volumes before the mixing of the two solutions.

Another example: after water and alcohol are mixed, the volume of the mixed solution is often less than the sum of the volumes before the mixing of the two solutions. From the above phenomena, it can be seen that the dissolution process is often accompanied by changes in temperature, volume, color, etc., which indicates that the dissolution process is not only the mechanical dispersion process of solute (the dispersion process is a physical process), but also the solvation process of solute and solvent combination (solvation process is a chemical process).

However, the formed solvates do not necessarily have a fixed composition. ）

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Wrong. The process of turning ice into water is called orange return to dissolve, which is a change of state of matter, and ice into water is an endothermic reaction.

It's melting, the ice gas is called gasification, the gasification of ice is called condensation, the ice gas is called sublimation, and the water is frozen and condensing.

Observable phenomena and explanations are:

Phenomenon 1: Freezing time is long. Conclusion: Water is a poor conductor;

Phenomenon 2: The rate of freezing is getting faster and faster. Explanation: As the temperature gets colder, the ice will return faster and faster;

Phenomenon 3: The location of the ice is turned outward. Conclusion: The location where the heat exchange occurs is first carried out through the cup wall direction.

Phenomenon 4: The icing progress of the left and right sides is the same, but the icing progress of the upper and lower sides is different (the bottom is more prone to icing than the top). Explanation: The lower the location of a certain space, the lower the temperature;

Phenomenon 5: The shape of the ice is basically the same as the shape of the device.

The process by which water freezes:

In fact, the process of water freezing is not simple, not that the temperature drops to 0, the water will freeze, but also needs the water to contain some small particles, as the attachment of water molecules when they just start to freeze, the small particles contained in the water are also called crystal nuclei.

The arrangement of the water atoms tends to be so that the oxygen atoms are facing outwards and the hydrogen atoms are facing inwards, and the oxygen atoms are slightly negatively charged, so they prefer to be surrounded by a positively charged environment. If the surrounding environment is positively charged and the temperature is below 0, then the water is prone to freezing, regardless of whether there are crystal nuclei in the water.

To start the freezing process at a higher temperature, the water molecules also need something else, such as dust, soot, or other impurities, so that the water molecules can form a lattice on them, which is the process of nucleation.

A supersaturated solution made from a crystalline substance such as sodium acetate or sodium carbonate.

When there is no external force, the supersaturated solution cooled by sodium acetate can judge the existence of Li in a normal state. Once subjected to friction, obvious vibration, or external force touching the mold, needle-like crystals will immediately appear. It looks as if the liquid freezes instantly.

Supersaturated solutions are unstable, and if the solution is stirred, vibrating, rubbing against the walls of the vessel, or by throwing solid "seeds" into the solution, the excess solute in the solution will immediately crystallize and precipitate. After the crystallization is delayed, the remaining mother liquor is a saturated solution in equilibrium with the solute crystals.

Normally, the temperature at which water freezes is 0 degrees, but on Earth, it is only possible for water to exist in liquid form because the temperature is usually between 0 and 100 degrees Celsius. So if the water freezes, the temperature must drop to at least minus 87 degrees.

When the temperature drops to minus 55 degrees, the molecular structure of the water must begin to change. The molecules will begin to form a tetrahedral shape, and each water molecule will loosely bind to the other four molecules. This creates another state of water:

"Ice-water intermediate state", although it does not yet have all the properties of ice, but water in that state can no longer be called water.

When dropped to this temperature, it is 87 degrees below the freezing point where we usually call the freezing point of false liquid water freezing. Researchers say that water at minus 55 degrees exists only because it lasts for a very short period of time, and our instruments are not enough to capture what it looks like when it remains liquid.

The properties of water are completely different from those of ordinary liquids. This is also the reason why it can maintain the reputation of liquid at dozens of degrees below freezing. Water is so strange because it has completely different properties from other liquids.

For example, ice floats on the surface of the water, and most of the solid material sinks into their liquid phase because of its greater density.

Then you need to make the crystal ice liquid. For very pure water, the structure of the liquid needs to be changed in order for ice to appear in the water. When you cool the water, its structure becomes close to that of ice, which is the reason for the decrease in its density, which is reflected in the increase in crystallization rate.