What is the difference between bond energy and energy in chemistry

Relationships and Differences.

Heat of reaction and matter energy relationship: h = total energy of the product - total energy of the reactant;

Relationship between heat of reaction and bond energy: h = sum of bond energy of reactants - sum of bond energy of product products.

The relationship between the two is that the greater the bond energy, the lower the energy possessed by the substance, that is, the more stable the substance. The smaller the bond energy, the higher the energy possessed by the substance, i.e., the more unstable the substance.

key energy. It is the energy expended to break a one-mole covalent bond or the energy released to form a one-mole covalent bond. It is an indication of the degree of solidity of the bonds between the atoms inside the substance formed by covalent bonds.

The greater the bond energy, the more energy is required to break the molecule, indicating that the atoms inside the molecule are bound more firmly.

Heat of chemical reaction (chemical energy).

All chemical reactions are essentially changes in the state of motion of the outermost electrons of an atom; The energy absorbed or released in a chemical reaction is called chemical energy. Total energy refers to the attraction and repulsion energy between the nuclei inside the molecule, the kinetic energy potential energy of electrons, and so on. The level of energy refers to the amount of energy that the substance has when it moves.

Its height determines the number of collisions when chemical reactions occur between substances, and whether chemical reactions are prone to occur, that is, whether substances are active.

Bond energy: A physical quantity that characterizes the strength of a bonding bond. For a diatomic molecule, it is numerically equal to the amount of energy required to break the binding bonds of a molecule into a single atom.

Heat of chemical reaction (chemical energy): All chemical reactions are essentially changes in the state of motion of the outermost electrons of an atom; The energy absorbed or released in a chemical reaction is called the chemical energy relationship and difference: the heat of reaction and the material energy relationship

h = total energy of the product - total energy of the reactant; It is also known that the larger and more stable the sum of the bond energies of a substance, the lower the energy it has. Relationship between heat of reaction and bond energy: h = sum of bond energy of reactants - sum of bond energy of product products.

The main differences are in nature, as follows:

Bond energy is a physical quantity that measures the strength of a chemical bond from the energy factor. For diatomic molecules, the bond energy is the energy absorbed by the dissociation of 1 mol of gaseous molecules into gaseous atoms. For polyatomic molecules, the bond energy is the energy absorbed by the complete dissociation of 1 mol of gaseous molecules into gaseous atoms and the energy allocated to each covalent bond in the structural formula.

Energy (energy) is a measure of the degree to which the spatial and temporal distribution of mass may change, and is used to characterize the ability of a physical system to do work.

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

Note: The bond energy magnitude cannot be used to represent the amount of energy of the matter, but only the difference between the free energy of the matter and the active state.

The relationship between the bond energy and the substance itself: the greater the bond energy, the lower the energy itself, and the smaller the bond energy, the higher the energy itself. Because of the low energy and stable structure, it needs to absorb more heat and has a large bond energy. 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. First of all, the bond energy, which is the energy released by the formation of 1 mol of chemical bonds by atoms. In terms of quantity, it is said for 1mol chemical bonds.

The more energy released from the formation of a 1mol chemical bond, the lower the energy of the substance; The more energy emitted by forming a 1 mol chemical bond, the greater the bond energy, and the greater the bond energy, the lower the energy.

Teacher, what is the difference between the total energy of a substance and the bond energy of that substance.

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First of all, the bond energy, which is the energy released by the formation of 1 mol of chemical bonds by atoms. In terms of quantity, it is said for 1mol chemical bonds. The more energy released from the formation of a 1mol chemical bond, the lower the energy of the substance; The more energy emitted by forming a 1 mol chemical bond, the greater the bond energy, and the greater the bond energy, the lower the energy.

All chemical reactions are essentially changes in the state of motion of the outermost electrons of an atom;

Energy absorbed or released in a chemical reaction.

Heat of reaction and matter energy relationship: h = total energy of the product - total energy of the reactant;

The larger and more stable the sum of the bond energies of a substance, the lower the amount of energy it has. Relationship between heat of reaction and bond energy: h = sum of bond energy of reactants - sum of bond energy of product products.

Bond energy refers to the energy of interaction between atoms.

The total energy of matter e=mc2, m is the mass of the physical relations of matter.

First, the concept is different.

1. Total energy: It is the measurement of the range of the motion period of the basic unit of matter in space. Modern physics has clarified the quantitative relationship between mass and energy, that is, Einstein's mass-energy relation: e=mc.

2. Bond energy: It is a physical quantity that measures the strength of a chemical bond from the energy factor.

Second, the measurement standards are different.

1. Total energy: The unit of energy is the same as the unit of work, which is joules (j) in the International System of Units. In the fields of atomic physics, nuclear physics, particle physics, etc., electron volts (EV) are commonly used as a unit, 1 electron volt = , 18 10 19 joules.

In the field of physics, erg (erg) is also used as a unit of energy, 1 erg = 10 7 joules.

2. Bond energy: under standard conditions, the energy required to dissociate 1mol of gaseous molecule AB(G) into gaseous atoms A(G) and B(G) is represented by the symbol E in units. The value of the bond energy is usually expressed as the standard molar reaction enthalpy change of the reaction at this temperature, and if the temperature is not specified, it should be.

Third, the measurement method is different.

1. Total energy: The essence of energy is a physical quantity measured in four-dimensional space in the physical sense, similar to the physical quantity measured in three-dimensional space - momentum, and the physical quantity measured in two-dimensional space - mass and so on.

2. Bond energy: Bond energy is a physical quantity that characterizes the strength of a chemical bond, which can be measured by the amount of energy required when the bond is broken. Under sum, the energy absorbed by breaking 1mol of gaseous molecule AB into an ideal gaseous atom is called the dissociation energy of AB (kj·mol-1), which is often represented by the symbol D(A-B).

I don't know which stage you're asking, but if you're in high school, you can understand it so simply: energy is carried by itself, and bond energy is the energy required to break a chemical bond. Therefore, energy is your own score, and key energy is the gap between you and your ideal university

The greater the chemical energy, the more unstable the substance, and the smaller the chemical bond energy.

The smaller the chemical energy, the more stable the substance, and the greater the chemical bond energy.

The bond energy is the energy that needs to be absorbed to break the chemical bond, and the lower the bond energy, the less energy is needed to break the chemical bond and form a new chemical bond. As long as the total bond energy of the newly formed chemical bond is greater than the total bond energy of the original bond, then the reaction will be exothermic. Therefore, the lower the energy of the original bond, the more likely it is that a new chemical bond with a greater bond energy will be formed, and heat will be released, that is, the greater the chemical energy.

The higher the bond energy of a chemical bond, the greater the total energy, and the lower the bond energy of a chemical bond, the smaller the total energy. The bond energy of a chemical bond is determined by the bond length of the bond and the radius of the bonding atom and the number of charges it carries. The breaking and formation of chemical bonds is the main reason for the change of energy in a chemical reaction – the breaking of chemical bonds absorbs energy, and the formation of chemical bonds releases energy.

Knowing whether a chemical reaction absorbs or emits energy depends on the total energy of the reactants relative to the total energy of the products. The bond energy of a general chemical bond is 100 to several hundred kj mol. The bond energy of hydrogen bonding is about 40kJ mol or less.

The formation of chemical bonds holds atoms firmly together into molecules in a certain way, so it is the fundamental reason for the stable existence of molecules or crystals.

Contrast. 1.The definition of bond energy is the energy absorbed by breaking a 1 mole chemical bond or the energy released by forming a 1 mole chemical bond.

Total energy is the amount of energy (internal energy) possessed by matter

2.When calculating the heat of reaction, if calculated by bond energy, the sum of the bond energies of the reactants is subtracted from the sum of the bond energies of the products.

For example, AA+BB==CC+DD, let the bond energy of A be H1, B, H2 C, H3 D, H4

h=ah1+bh2-ch3-dh4

Some substances are not 1 mole of species 1 molar chemical bond, these special cases are to remember 1 molar p4 (4 molar p) 6 molar chemical bond, 1 molar crystalline silicon 2 molar chemical bond, ......These are related to molecular structure. Not much to say here.

If the total energy is calculated, the sum of the energies of the products minus the sum of the energies of the reactants.

Let the product energy e1 and the reactant energy e2

h=e1-e2

Again, δH<0 exothermy.

h>0 endothermy.

Bond energy is the lowest energy released by gaseous ground state atoms forming 1mol chemical bonds.

The lower the total chemical energy of a substance, the more stable it is, and the higher the bond energy, the more stable it is.

Upstairs, "the higher the bond energy of the chemical bond, the greater the total energy, the lower the bond energy of the chemical bond, the smaller the total energy" is wrong, the higher the bond energy of the chemical bond, the lower the total energy, because the lower the energy, the more stable, and the higher the bond energy, the greater the energy required to break the 1mol bond, so the lower the energy.