If the volume of a fixed object remains the same, can a solid still melt into a liquid?

I can melt it. The so-called solid, its molecules can only vibrate near the equilibrium position due to the strong intermolecular forces. When you say that the fixed volume is fixed, you mean that the distance between molecules does not increase by using the method of external high pressure, but with the heating, the temperature of the object increases, and the kinetic energy of the molecules to move irregularly increases, and when it increases to a certain extent, it will be able to overcome the constraints of the strong intermolecular force and leave the equilibrium position, and the solid will become a liquid!

I don't know what knowledge level the landlord has, junior high school, high school, and college?

According to the three-phase diagram in physical chemistry, theoretically speaking, it is possible, mainly depending on the increase in temperature or the increase in melting point caused by pressure, which increases faster. In other words, if the temperature rises, it can exceed the increase in the melting point due to the pressure due to the increase in volume, and it can be melted.

No! According to the theory of molecular dynamics, if the volume is constant, then the average distance between molecules will not change, and since the distance between the molecules of the solid is the smallest, the liquid homogeneous gas is the largest, so the average distance between the molecules will not change, then the state of the object will not change.

It can be melted. Because there is a distance between the molecules of the liquid, it is still in the liquid form even if it is compressed. (The required melting point will be lower).

No! The temperature rises. Internal pressure is also elevated.

The boiling point is elevated.

Does not melt.

Heating the object increases the internal energy of the object through heat transfer, and at the same time the pressure of the object on the wall of the container.

It will increase when the sealed object container cannot resist the internal energy of the object, the object will liquefy or.

Direct vaporization. If the container carrying capacity of the sealed object is infinite, then it will not liquefy.

Yes, you can. Isn't there a substance called water glass?

It is a special state of water.

i.e. between solid and liquid water village in a form.

The above questions are impossible in most respects.

But there must be special examples.

A lot of the above mentions pressure, and for solids, pressure has very little effect on the melting point, negligible.

As long as the temperature is high enough, he can melt, but he is compressed very tightly, and it takes a lot of energy to overcome this force, but it can still be done.

As long as the molecular bonds are broken, it is impossible to maintain the shape of the solid. As long as you have enough energy, it's okay.

The biggest difference between liquids and solids is that one is a two-dimensional structure and the other is a three-dimensional structure.

However, in the three-phase diagram, the solid-liquid line cannot exceed the three-phase point and continue to extend to the direction of the increase of t, p value, that is, it must be in a molten state, and the metal bond action decreases, even if the pressure is large, the metal ions still do a fierce irregular movement, although the volume is fixed, but the metal can no longer maintain its own shape, in fact, it is a high-pressure liquid state.

Yes. Because you have increased his inner energy.

That's a good question! Maybe not what the middle school physics range can describe.

There has to be a way to fix it completely.

Because the container also expands when heated.

It depends on the coefficient of thermal expansion of the container in which you are holding the object

This is a question of molecular spacing, when a solid is heated, the rate of molecular motion accelerates, and the spacing between molecules increases, so the volume of the solid generally becomes larger after it melts into a liquid. If the interval between the molecules continues to increase as they continue to be heated, it becomes a gas. (Note:.)

The exception to this is when the ice becomes water, because the hydrogen bonds between the water molecules bind the water molecules together (H2O)3 or (H2O)4, and the spacing between them also increases. ）

Most substances increase in volume when melted and decrease when solidified, while a few substances such as antimony, bismuth, gray cast iron, etc., increase in volume when solidified.

Solids melt in solution. The molecules in the solid are arranged very closely, and after melting, the molecular spacing becomes larger, that is, the molecules are far away from each other in this process, because the direction of the intermolecular nuclear dismantling force is directed to the direction of the two molecules approaching, so it is necessary to overcome the intermolecular force to do work (in fact, the essence is to let the solid have higher internal energy, that is, let the molecules have higher kinetic energy to get rid of the shackles of the intermolecular force), so it is necessary to absorb heat.

Melting and solidifying.

The process by which a substance changes from a solid state to a liquid state is called melting, and the process by which a substance changes from a liquid state to a solid state is called solidification. Solid, liquid, and gaseous are the three common states of matter, and matter will change between the three states of solid, liquid, and gas.

At room temperature, air is in a gaseous state, alcohol is in a liquid state, and copper is in a solid state. According to the different characteristics of solid melting, solid can be divided into two types: trace imitation and amorphous. Crystals have a certain melting temperature.

The temperature remains the same when melting. Amorphous does not have a certain melting temperature, and the temperature continues to rise during melting. When the solid melts, it absorbs heat from the outside.

The internal energy is increased by bai.

1. Internal energy: constituting objects.

all molecules of du.

zhi, the sum of the kinetic energy and the potential energy of the molecule in its thermal motion, is called the genus.

Do the internal energy of the object. Unit: joules.

1) Molecular kinetic energy: The energy possessed by all the molecules in an object to move irregularly is called molecular kinetic energy.

Molecules are constantly moving in an irregular motion, and like all moving objects, moving molecules have kinetic energy. The higher the temperature of the object, the faster the molecules move and the greater their kinetic energy.

2) Molecular potential energy: Since the molecules have a certain distance between them and also have a certain force, the molecule has potential energy, which is called molecular potential energy.

2. The relationship between the internal energy and temperature of an object

When an object is in the same state, the higher the temperature, the greater its energy limit;

As the temperature of the object decreases, the internal energy decreases, and when the temperature increases, the internal energy increases.

When the state of the object changes, the internal energy of the object changes despite the constant temperature.

For example, when the crystal is melted, the molecular kinetic energy does not change, but when the object changes from solid to liquid, the intermolecular distance increases, and the molecular potential energy increases.

During the melting of matter from solid to liquid state, the kinetic energy of the molecule remains unchanged, the distance between the molecules increases, and the molecular potential energy increases. The internal energy is the sum of the kinetic energy and the potential energy of the molecule, so it increases.

I increase by absorbing energy.

1.After the solute is dissolved in the solvent, a solution has been formed, so it is not possible to discuss only whether the volume of the solvent changes or not.

2.After the solute is dissolved in the solvent, the volume of the solution must change. The main reason for the change is that the solute particles intervene in the solvent particles, which changes the interaction between the solvent particles, and this change depends on the solute and the solvent particles, so there is no consistent law.

3.Illustrate.

When a solvent is solid, such as an alloy, the density is generally reduced – which means that the intervention of the metal atoms as a solute changes the way the metal is stacked as a solvent.

When the solvent is liquid, such as water as the solvent, the results are different due to the different effects of the solute on the hydrogen bonding: ethanol dissolved in water leads to an increase in density and a decrease in volume; However, the concentration of NH3 when dissolved in water increases – the volume decreases.

When the solvent is a gas, the intermolecular force is weak due to the large spacing between the molecules of the gas. Therefore, at room temperature and pressure (that is, under the conditions of generally conforming to the ideal gas), the volume of the gas can be added - that is, the gas molecules do not interact with each other to change the volume size. After dialysis, there is usually some change in the volume of proteins.

A solution with a low osmolality will move towards a solution with a high osmolality, causing a change in volume after dialysis. In the case of ammonium sulfate salting-out, the volume change may be larger, and in the case of sodium chloride salting-out, the change may not be obvious. But there will be some increase.

on 25 Dec 2019

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The chemical reaction between the solid and the liquid, whether the volume of the liquid increases, to analyze the specific situation, the iron reacts with hydrochloric acid to form ferrous chloride and dissolves in hydrochloric acid, and the volume of hydrochloric acid does not increase. The chemical composition of lime is calcium oxide, which is a solid, and the lime is added to hydrochloric acid, and the products are calcium chloride and water, in this case, the volume of hydrochloric acid solution will increase.

Any solid will not liquefy when heated! Liquefaction refers to the process by which matter changes from a gaseous state to a liquid state, which has nothing to do with solids (you may be confusing the concept). Any gas can be liquefied when the temperature drops low enough;

At a certain temperature, the volume of compressed gas can also liquefy certain gases.

The transformation of a substance from solid to liquid is the melting process, not the liquefaction process as you say. Ice into water is the melting process, iron, aluminum and other metal blocks become liquid at high temperature is the melting process, in addition, wax, rosin, asphalt, glass and other substances can also be melted, but some substances that will undergo chemical changes under high temperature conditions (chemical change refers to the production of new substances) will not melt, because melting is only a physical change (no new substances are produced).

Melting is a process of change in which a substance is changed from a solid state to a liquid state by heating it. Melting requires the absorption of heat return, which is an endothermic process.

A crystal has a certain melting temperature, called the melting point, which is equal to its freezing point at standard atmospheric pressure. The endothermic temperature of the crystal rises and begins to melt when it reaches the melting point, at which point the temperature does not change. After the crystals have completely melted into a liquid, the temperature continues to rise.

During the melting process, the crystals are in a state of coexistence of solid and liquid.

Amorphous does not have a certain melting temperature. The amorphous melting process is similar to that of crystals, except that the temperature continues to rise and it needs to be continuously heat-absorbed.

Melting point is one of the properties of crystals, and different crystals have different melting points.

Solidification is the reverse process of melting. Experiments have shown that both crystalline and amorphous are emitted heat during solidification. The temperature of the crystal remains constant during the solidification process, and this temperature is called the solidifying point of the crystal.

The freezing point of the same crystal is the same as the melting point. Amorphous has no freezing point and no melting point.

Conditions for crystal melting:

The temperature reaches the melting point;

Continue heating after reaching the melting point. (endothermy).

If it is to go back to the original temperature, then the volume will not change.

Change of state of matter: In physics, we call the process of change of matter from one state to another as a change in the state of matter.

Process three states and six changes and endothermic and exothermic conditions:

Change of state of matter. Melting: Solid liquid (endothermic);

Coagulation: Liquid solid (exothermic);

Vaporization: (boiling and evaporation): liquid gaseous (endothermic);

Liquefaction: (two methods: compressing the volume and reducing the temperature): gaseous liquid (exothermic);

Sublimation: solid gaseous (endothermic);

Condensation: gaseous solid state (exothermic).

The process of changing a substance from a solid state to a liquid state, from a liquid state to a gaseous state, and from a solid state to a gaseous state requires the absorption of heat from the outside; In the process of changing from a gaseous state to a liquid state, from a liquid state to a solid state, and from a gaseous state directly to a solid state, heat is released to the outside world.