Chemistry questions about nitrogen nitrogen double bonds

Wrong. The bond energy of nitrogen and nitrogen triple bond is higher than that of CH4, but the high bond energy is only its thermal stability, or the property is more stable. The boiling point depends first of all on the type of crystal, and since they are all molecular crystals, the boiling point is high due to the large intermolecular forces.

The intermolecular forces of N2 and CH4 are smaller, because the relative molecular weight of N2 is higher than that of CH4, and N2 is linear and CH4 is tetrahedral type, so the boiling point of N2 is higher than that of CH4.

Wrong. The triple bond energy in N2 is indeed large, but this has nothing to do with the boiling point. When a substance boils, it does not open the covalent bonds within the molecule.

Therefore, the boiling point should be measured by the intermolecular forces, not the bond energy. Because both N2 and CH4 are non-polar molecules, and the molecular weight N2 >CH4, the dispersion force N2 >CH4So the N2 boiling point is higher.

N2 is the triple bond of nitrogen and nitrogen

No, the chemical bonds in a molecule only affect the chemical properties of the molecule and have little effect on the physical properties. The reason why N2 has a higher boiling point than methane is because its relative molecular mass is higher than the other side, N2 is 28 and methane is 16

I hope mine satisfies you

Wrong. First, there are triple bonds of nitrogen and nitrogen in the N2 molecule, not double bonds.

Second, N2 and CH4 are covalent compounds, and the two solids are molecular crystals, and their melting and boiling points are determined by intermolecular forces, independent of the internal bonds of the molecule itself.

The structure of the two is not similar, so it cannot be explained simply by the relative molecular mass.

The factors for the triple bond energy of nitrogen and nitrogen are greater than three times that of nitrogen and nitrogen single bond are as follows:

The strength of a chemical bond is not only related to the bonding atoms, but also to the bond length failure.

The triple bond of nitrogen and nitrogen greatly shortens the bond length, so that the bond energy of the original sigma bond is higher than that of the ordinary single bond of nitrogen and nitrogen, and the bond energy of the pi bond is also improved.

In fact, it is impossible to simply break the bonds, they are all averages, the more bonds, the closer the atoms are, the more the electron clouds overlap, the greater the bond energy, not a simple superposition relationship.

There are two main reasons why the repulsion of lone electrons and the energy of molecular orbitals make the bond cavity wither, and the triple nitrogen bond is much greater than the sum of the bond energy of the double bond and the single bond

1.The repulsion of lone pairs of electrons: the repulsion of lone electron pairs on the nitrogen atom involved in bonding, the closer the lone electron pairs, the greater the repulsion, the weaker the chemical bond, for the nitrogen and nitrogen single bond, the distance of the lone electron pair is the closest when it is formed, which will weaken the nitrogen and nitrogen single bond, so that the bond energy is seriously small, and for the nitrogen and nitrogen triple bond, it is the farthest away and the weakest repulsion when it is formed, resulting in a stronger chemical bond.

2.Molecular orbitals: According to the molecular orbital theory, when the triple bond of nitrogen and nitrogen is formed, the energy of the valence orbital 2s and 2p of nitrogen is close, and the energy level order between the s bond and the bond is changed when it is combined.

Molecular Orbital Theory:

Molecular orbital theory, also known as the molecular orbital method, was proposed in 1932 by American chemist Malikon and German physicist Hundt, and is one of the modern covalent bond theories.

The main points of the theory are: to discuss the structure of the molecule from the integrity of the molecule, it is believed that after the atom forms the molecule, the electron no longer belongs to the individual atomic orbitals, but belongs to the molecular orbital of the whole molecule, and the molecular orbitals are polycentric; Molecular orbitals are made up of a combination of atomic orbitals.

When forming molecular orbitals, the principle of energy approximation, the principle of symmetry consistency, and the principle of maximum overlap are followed, that is, the three principles of bonding. The principle of filling molecular orbitals with electrons in a molecule is also subject to the principle of lowest energy, Pauli's principle of incompatibility, and Hunt's rule.

Answer: B Analysis: Analysis:

If there is only one single bond between two nitrogen atoms in term a, the single bond can rotate around the axis according to the characteristics of the root rent mu elimination single bond, there can be no cis-trans isomerism in , so if there is a triple bond between nitrogen atoms in term A and term c, only three covalent bonds can be formed according to the nitrogen atom.

characteristics, it is not unscrupulous to know that it can be bonded with f atoms again; Because it is impossible to form a coordination bond between the nitrogen atom and the fluorine atom.

Therefore, c and d are wrong In the B term, the nitrogen atom forms a double bond, because the double bond cannot be rotated, so the position of the four atoms is relatively fixed, and because there is a lone pair of electrons in both nitrogen atoms, and the position of the lone pair of electrons and the fluorine atom is different, it forms cis-trans isomerism, such as: Summary of rules and skills: The key to solving this question is to infer the bonding of the molecule according to the spatial structure of the molecule Only when there is a double bond in the molecule can there be cis-trans isomerism, such as alkenes.

That is, there is cis-trans isomerism

The bond energy of the double bond of the nitrogen and nitrogen main shed is 418 kg per mole.

Bond energy is usually obtained by thermochemical methods or spectrochemical experiments to determine the dissociation energy, and the bond energy is often used to indicate the strength of a certain bond.

The bond energy cannot be used to express the amount of energy of matter, but only the difference between the free energy of matter and the active state, and the relationship between bond energy and matter itself: the greater the bond energy, the lower the energy itself, and the smaller the bond energy, the higher the energy itself.

As a reactant, the substance needs to absorb heat during the reaction, and the above reasons are because: the energy is low, the structure itself is stable, and the land disturbance needs to absorb more heat, and the bond energy is large. The energy is high, the structure itself is unstable, the heat that needs to be absorbed is low, and the bond energy is small.

Summary. Why can a nitrogen-nitrogen double bond bond be greater than a double single bond.

Nitrogen-nitrogen double bonds are chemical bonds formed by two nitrogen atoms sharing a pair of electrons through a co-high chain. They possess an extra pair of electrons than a single bond, which allows them to form stronger chemical bond beams and are therefore more stable than single bonds.

Why are the chemical bonds in nitrogen one is δ bond, and the two are bond.

Hello δ bond formed by the overlap of the valence electrons of two identical or identical atoms along the direction of the axis of symmetry of the orbit is called a δ bond. In chemistry, a δ bond (delta bond) is a type of covalent bond that consists of two d orbitals quadruple overlapping. δ bond has only two node planes (planes with zero electron cloud density).

The symmetry of the S-Sδ bond is the same as that of the S-Pδ bond, which refers to the chemical bond formed by the overlap of the primordial bond, the sen-orbital, perpendicular to the bond axis, in a "shoulder to shoulder" manner. When forming a bond, the overlapping parts of the atomic orbitals are equally distributed on the plane and the lower sides of the plane including the bond axis, with the same shape and opposite symbols, which is mirror antisymmetry. The Greek letter in the name represents the p-orbital because the orbital symmetry of the bond is the same as the p-orbital domain.

p orbitals are usually involved in the formation of bonds, however, d orbitals are also involved in the formation of bonds.

<> Physicochemical properties of nitrogen:

There are about 4,000 trillion tons of gas in the atmosphere, of which nitrogen accounts for 78%. Nitrogen is slightly soluble in water and alcohol. It is non-flammable and is considered a asphyxiating gas (i.e., breathing pure nitrogen deprives the body of oxygen).

Although nitrogen is considered an inert element, it forms some very active compounds. It can be used as a diluent and controls the natural rate of combustion and respiration, which is faster at higher oxygen concentrations. Nitrogen is soluble in water and alcohol, but it is basically insoluble in most other liquids.

It is essential in life, and its compounds can be used as food or fertilizer.

Nitrogen is used in the manufacture of ammonia and nitric acid. Nitrogen is essentially an inert gas at ambient and medium stocking temperatures. As a result, most metals are easy to handle with it. At elevated temperatures, nitrogen can be aggressive and aggressive to metals and alloys.

Summary. Hello dear, I am very happy to answer for you, the alkalinity of triple bond nitrogen is less than the alkalinity of double bond nitrogen, because the addition reaction is an organic chemical reaction, which occurs in substances with double or triple bonds. After the addition reaction, the heavy bond opens, and the atoms at each end of the original heavy bond are connected to a new group.

The addition reaction is generally the reaction of two molecules to form one molecule, which is equivalent to the chemical reaction of inorganic chemistry. According to the mechanism, addition reactions can be divided into nucleophilic addition reactions, electrophilic addition reactions, free radical additions, and cycloadditions. The addition reaction can also be divided into cis addition and trans addition.

Hello dear, I am very happy to answer for you, the alkalinity of triple bond nitrogen is less than the alkalinity of double bond nitrogen, because the addition reaction is an organic chemical reaction, which occurs in substances with double or triple bonds. After the addition reaction is carried out, the heavy bond is opened, and the atoms at both ends of the original heavy bond are connected to a new group. The addition reaction is generally the reaction of two molecules to form one molecule, which is equivalent to the chemical reaction of inorganic chemistry.

According to the mechanism, the addition reaction can be divided into nucleophilic addition reaction, electrophilic addition reaction, free radical addition and land sail and formation, and cycloaddition. The addition reaction can also be divided into cis addition and trans early staring addition.

The answer to this is a

The answers to this question are A and C

What is the last question.

Affinity. The last question is what is extracted separately for each step.

Covalent bonds are formed between atoms in a molecule, and first a sigma bond is formed, and there is only one sigma bond.

The rest are keys

Therefore, in the nitrogen molecule, there are n three n, one is a sigma bond, and there are three single electrons in the 2p orbital of the two bond n atoms, each of which has a p orbital that meets head to form a sigma bond, and since the three p orbitals themselves are perpendicular to each other, after a pair of p pairs meet head-to-head, the remaining two pairs can only overlap in the form of shoulder to shoulder, and then form a bond