Fire burning is where the energy produced comes from

The light and heat energy produced by fire combustion is because it is a violent oxidation reaction, it is an exothermic reaction, and the energy that is burned comes from the chemical energy of the matter itself, which becomes light energy and heat energy, which is physical.

Nuclear fusion is not the smallest unit of chemical change is the atom The essence of chemical change is the recombination of atoms. The change that does not produce other substances is a physical change, while nuclear fusion is a change inside the nucleus of an atom that exceeds the range of chemical changes and at the same time generates new matter.

Combustion: I just want to say that combustion is exothermic and exothermic is strong, and there are also reactions that are endothermic and strong, but not combustion. The other satisfaction has been made clear.。。 I don't know if fusion is a physical reaction or whatever.

It's not chemistry anyway. I don't know exactly how much energy will be released. The energy emitted by the disappearance of the electron can be measured by energy equal to mass multiplied by the square of the speed of light (Einstein's mass-energy conversion formula).

But in fact, it is far from this value. This is because only a small fraction of the electrons are annihilated during the fusion process. But there's a lot of energy released.

Just look at the hydrogen bomb. To calculate the amount of energy contained in matter, we also use Einstein's formula... But what we calculate is the total annihilation of the object, which is the energy that would be released if it were completely non-existent ...

It's impossible for one atom to blow up the earth. Because it seems that an antimatter atom collides with a matter atom and annihilates the energy that can't even light a light bulb. But if you can get a few g of antimatter.

Collide with matter and then annihilate. It's easy to blow up the earth or something...

The essence of a chemical reaction is a chemical bond.

The recombination, i.e., the old bond breaks and the new bond is formed. When the old bond breaks, it needs to absorb energy, and the new bond is formed to release energy, and the final manifestation is to release heat or endothermic depending on the strength of the process.

From a chemical point of view: the energy contained in each substance is different, so although the mass of the substance remains unchanged before and after the reaction, the energy contained in different substances changes, and the excess energy is released because the total energy of fuel and oxygen is greater than the total energy of the product during combustion.

Nuclear fusion is a physical reaction and is a deeper change than a chemical reaction.

Even if it is reduced, it is negligible if you use e=mc2, so the quality loss is generally not considered.

Fusion is hard to say,

Combustion does not necessarily produce a flame, and the reason why combustibles burn with a flame is because of flammable gases.

in combustion, e.g. hydrogen, carbon monoxide.

When burning, there is a flame, and when wood burns, the fire is raging, because wood can volatilize flammable gases when burning.

Light is a type of energy that generates heat.

Phenomena generally have light, so combustion generally has light. Only gas combustion has a flame, and some solid combustion looks like it also has a flame, but in fact, the result of combustion after solid gasification at that time is essentially the combustion of gas.

The concept of combustion is: combustion is a light, heat-rising, violent chemical reaction.

General chemical definition of combustion: combustion is a violent luminous and calcitrant oxidation reaction between combustibles and combustibles. Broad definition of combustion:

Combustion refers to any violent reaction that emits light and heat, and does not necessarily require oxygen to participate. Combustion is divided into: flash ignition, **, ignition, spontaneous combustion.

Combustion conditions: combustibles reach the ignition point. Ignition point, the minimum temperature required for combustion.

Generally, combustion is attended by oxygen, but in some special cases, combustion can be carried out under oxygen-free conditions.

In the process of combustion, the momentum, heat and mass transfer between fuel, oxygen and combustion products are transferred, forming a complex structure of flame with multi-component concentration gradient and non-isothermal two-phase flow.

These transfers in the flame are realized by laminar molecular transfer or turbulent micro-mass transfer, while in industrial combustion devices, turbulent micro-mass transfer is the main focus, and exploring the law of velocity, concentration, temperature distribution in the combustion chamber and the interaction between them is an important part of the study of the combustion process from the perspective of fluid mechanics.

The Three Elements of Combustion:

There are three basic conditions that must be met for combustion to occur: there must be silver balance combustibles, such as wood, natural gas, oil, etc. There should be combustible substances, such as oxygen, potassium chlorate, etc.; There must be a certain temperature, combustibles, oxidants and ignition sources, which are called combustion triads, and combustion occurs when these three elements are present at the same time and interact with each other.

The combustion reaction is one of the earliest chemical reactions recognized by human beings. The combustion reaction theory is one of the earliest chemical theories established by chemists that can explain chemical phenomena in a unified manner. The first stage was in the middle of the 17th century, when phlogiston theory appeared.

Directing chemists to the study of the process of chemical reactions has led to many chemical discoveries.

Combustion is a kind of chemical reaction that emits positive heat and luminescence, and its reaction process is extremely complex, the chain reaction of free radicals is the essence of the combustion reaction, and light and heat are the physical phenomena that occur during the combustion process. Combustibles react with oxygen or air in a rapid exothermic and luminous oxidation reaction and appear in the form of a flame, The combustion of coal, oil and natural gas is the main thermal power of various sectors of the national economy.

The fundamental reason for the combustion of flames is that a large amount of heat is emitted during combustion, which makes the surrounding air molecules intensify their movement and emit light.

The essence of flame is the phenomenon that the air molecules around the reaction zone are heated and move at high speed in an exothermic reaction, thereby emitting light.

In a combustion reaction, when the total energy of the reactant is greater than the total energy of the product, a part of the energy is diffused outward in the form of heat energy. The heat energy released outward accumulates around the reaction zone, heating the surrounding air, causing the surrounding air molecules to move at high speed, the faster the movement, the higher the temperature.

The energy released from the combustion reaction zone gradually increases from the center of the flame to the outer flame, and then decreases sharply, so that the flame has a clearer outline, and the boundary between the flame and the surrounding air is the place where the reaction energy decreases sharply.

If the temperature during combustion is higher than the boiling point of the substance, then there will be a flame when combusting, otherwise there will be no flame, the boiling point of sodium is 883 degrees, and the temperature during combustion is 1400 degrees, so there will be a flame when sodium is burned.

Since the temperature of charcoal when it is burned is less than the boiling point of charcoal, charcoal burns in oxygen without a flame. So why does burning in the air often produce flames, this is because the concentration of oxygen in the air is low, and the incomplete combustion of charcoal produces flammable gases such as carbon monoxide, and the boiling point of the gas is low, far lower than the temperature when the gas is burned, so these continue to burn to produce flames.

A flame is the volume of gases and vapors that a combustible substance is burning. It is generally composed of three parts: the flame core, the inner flame, and the outer flame.

Answer: When the fuel is burned, the heat generated is converted into (internal energy).

Combustion is the process of rapid oxidation of objects, producing light and heat. The essence of combustion is a redox reaction. Heat generation when fuel is burned is the conversion of chemical energy into internal energy.

Heat generation when the fuel is burned is the conversion of chemical energy into heat energy.

Chemical energy is a very hidden energy, it cannot be directly used to do work, and can only be released when chemical changes occur, turning into heat energy or other forms of energy. Things like the combustion of oil and coal, explosives**, and the energy emitted when the food you eat undergoes chemical changes in your body. Chemical energy refers to the energy stored in matter, according to the law of conservation of energy, the change of this energy and the change of heat energy in the reaction is equal in magnitude and opposite in sign, when the atoms in the compound participating in the reaction are rearranged to produce a new compound, it will lead to a change in chemical energy, resulting in an exothermic or endothermic effect.

Principles of 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, and the ** of chemical energy is the result of the change of the motion state of the outermost electrons of the atom and the change of the atomic energy level in the chemical reaction.

Atoms are formed by the bonding of nuclei and electrons by electromagnetic fields, molecules are formed by the bonding of atoms by electromagnetic fields (chemical bond energy), and objects (solids, liquids, gases, non-living and living things) are formed by the bonding of molecules by electromagnetic fields (intermolecular forces). A chemical bond is a form of existence of a substance, and a chemically bonded substance is an electromagnetic field substance. A chemical reaction is the process by which atoms recombine to form a new substance.

During a chemical reaction, the bond energy level of a chemical bond changes, resulting in the phenomenon of chemical energy. When the bond energy (electromagnetic field energy level) increases, it is an energy-absorbing reaction, and when the bond energy decreases, it is an energy-exergating reaction.

The breaking and formation of chemical bonds is the main reason for the energy change of a substance in a chemical change. Therefore, the chemical reaction of matter and the energy change of the system occur at the same time.

Chemical energy is converted into heat energy (molecular kinetic energy).

1. Some non-metallic elements, such as carbon, sulfur, phosphorus, silicon, etc.;

2. Most of the metal elements, such as sodium, magnesium, potassium, lithium, etc.;

3. Some gaseous hydrides, such as H2S, CH4, etc.;

4. A small amount of oxides, such as CO;

5. Most organic matter, such as methanol, acetone, oil, etc.

Any energy that can cause the combustion of combustible substances is called a clump ().

Combustibles. Ignition source judge friend (correct answer).

Gas excavation Zheng Huai body combustibles.

Liquid combustibles.