Does an object break a chemical bond from one state to another

An object changes from one state to another, and its molecules do not change, right, so the chemical bonds within the molecules do not break, but the chemical bonds between molecules are not necessarily, such as hydrogen bonds in water. The hydrogen bonds break when the water evaporates. In addition, when the ionic crystal becomes molten, the ionic bond will break.

The situation is different for different types of crystals.

Molecular crystals do not break bonds (not necessarily chemical bonds between molecules).

There are parts of atomic crystals that break bonds, such as diamond to graphite.

The ionic crystal must break the bond.

The bonding of metal crystals is actually attracted by electric charge, and the situation is not easy to say after melting, it should be broken (energized and insulated).

In addition, there are many substances that do not have chemical bonds.

It should be said that it would. For example, table salt crystals.

He is crystal very strong.

We know that the main ingredient in table salt is sodium chloride.

Chloride + Nano.

They are arranged in a one-to-one ratio that is a bit like diamonds.

So their position is very fixed, that is, the physical properties are relatively hard.

When the salt is melted, it becomes a free form of sodium ion + chloride ion.

So the chemical bonds should change when they go from solid to liquid.

No, the change in the state of an object is a physical change, microscopically speaking, only a change in the distance between molecules.

The breaking and recombination of chemical bonds is the essence of chemical change.

Absolutely not, that's a physical change. Broken bonds are unique to chemical reactions!

It is not possible for a chemical bond to break back into the formation of new substance.

Some will be some and some won't.

If the covalent bond is connected, it will not break.

But the programmed molten state of the ionic bond will break.

Not necessarily. The analogy of water from liquid to gas is broken by the hydrogen bonds.

The essence of chemical reactions:

There are many theories about the nature of chemical reactions, and one of them is that the landlord said that the old chemical bonds break and new chemical bonds are formed.

We know that chemical reactions require the formation of new substances, and the reason why different substances are different is due to the different molecular composition of different substances, that is, different substances, the types of elements composed of their molecules, the number of atoms, and the structure are different, so to have a chemical reaction, that is, to generate new substances, there must be a recombination process of molecules, that is, molecules must be broken into atoms first. The atom is recombined into a new molecule (which is why the essence of chemical reaction is the dismantling and recombination of molecules), and the breaking of molecules needs to destroy the molecular composition: the force between atoms, and the strong interaction between atoms in this molecule is the chemical bond, so the breaking of molecules is essentially the breaking process of chemical bonds, and similarly, if the atoms want to recombine into a new molecule and become a new stable whole, then there must be an interaction force between the atoms. And rely on this interaction, the molecule is restructured, and this interaction force in the chemical reaction must be different from the previous broken interaction force, this new molecule, the interaction force between atoms is the new chemical bond, so the essence of the chemical reaction can also be said to: the old chemical bond breakage, the new chemical bond formation process.

PS: Only the breaking of chemical bonds is not necessarily a chemical reaction, for example, the ionic compound dissolved in water is partially ionized, which actually breaks the ionic bond under the action of water molecules, but no new chemical bond is formed.

Chemical changes: Breaking of old bonds and formation of new bonds.

Because the essence of chemical reaction is the generation of new substances, and substances are composed of molecules, and molecules are composed of atoms, and atoms and atoms are connected by chemical bonds, and when a chemical reaction occurs, the old substance disappears and new substances are generated, that is, new molecules are generated, and the types of atoms that make up the molecule remain unchanged, so the essence of chemical reactions is that the old chemical bonds are broken to form new chemical bonds.

Correctly, the chemical change must be accompanied by the breaking and formation of chemical bonds. The breaking of the old chemical bond opens and the new chemical bond is formed.

However, the change of chemical bond breaking or formation is not necessarily a chemical change, such as metal melting, NaCl dissolving in water, NaCl crystal precipitation from solution, volatilization of HCL gas from concentrated hydrochloric acid, etc., although there are chemical bond breaks or formation, it is still a physical change.

A. HCl is soluble in water, ionization occurs, chemical bonds are broken, and there is a break of chemical bonds in physical changes, so A is not selected; B. The chemical bond of Jianlunqing is the force that binds ions or atoms together, so B is selected; c. The breaking chemical bond should absorb energy, and the formation of the chemical bond should release the pre-energy amount, so C is not selected; d. Hydrogen bonds do not belong to chemical bonds, and are much weaker than chemical bonds, so Tongtong D is not selected; Therefore, choose B