Are oxidation reactions exothermic? What is the chemical reaction of exothermy?

Oxidation reactions are not necessarily exothermic, and chemical reactions are not necessarily exothermic. The oxidation reaction is also a reduction reaction in nature, and the chemical reaction basically has energy changes, some are exothermic and some are endothermic, such as c + H20 = CO + H2 which is a redox reaction, which is endothermic. A reaction tends to have a reverse reaction, but some of the reverse reactions have a very small tendency to proceed, and one reaction is the reverse reaction of its reverse reaction.

The forward reaction is exothermic, and the reverse reaction is endothermic.

When the general substance oxidizes with oxygen, it is exothermic, and some may absorb heat such as the reaction between nitrogen and oxygen. In electrochemistry, the anode is oxidized and the cathode is reduced.

The effect of electron loss in matter is called oxidation; On the contrary, the action of gaining electrons is called reduction. Oxidation reaction in the narrow sense refers to the combination of substances and oxidation; A reduction reaction is the action by which a substance loses oxygen. The oxidation value increases during oxidation;

The oxidation value decreases when reduced. Oxidation and reduction both refer to reactants. Oxidation is also known as oxidation reaction.

When organic matter reacts, the effect of introducing organic matter into oxygen or removing hydrogen is called oxidation; The action of introducing hydrogen or losing oxygen is called reduction. The oxidation of a substance that reacts slowly with oxygen and slowly heats up without emitting light is called slow oxidation, such as metal rust, biological respiration, etc. Intense luminous oxidation is called combustion.

All combustion reactions are oxidation.

All combustion reactions are exothermic, but oxidation reactions are not necessarily exothermic.

1. The hydride formation reaction is an exothermic reaction.

For example, hydrogen and fluorine are exothermic in the dark: H2 +F2 = 2HF2, and the formation of oxides is an exothermic reaction.

For example, charcoal is burned in air or oxygen to exothermic: C+O2 = CO23, the formation of oxygenated acids.

For example, sulfur trioxide dissolved in water to form sulfuric acid is an exothermic reaction: SO3 + H2O = H2SO44, and the formation reaction of strong alkali is an exothermic reaction.

For example, sodium oxide reacts with water to form sodium hydroxide and is exothermic: Na2O+H2O=2NaOH<>

Common types of endothermic reactions:

1. Most decomposition reactions:

CaCO3 = (high temperature) CaO+CO2

CuSO4·5H2O=CuSO4+5H2O2, salt hydrolysis reaction.

3. Ionization. 4. A small number of chemical reactions: C (S) + CO2 (G) = (high temperature) 2Coi2 + H2 = 2Hi (this reaction is a reversible reaction because the generated hydrogen iodide is unstable) 5. Others: the relative size of the total energy of the reactants and products of the endothermic reaction c + H2O (g) = (high temperature) CO + H2

The above content refers to Encyclopedia - Exothermic Reaction.

Encyclopedia—endothermic reactions.

Most chemical reactions are exothermic reactions, such as combustion, neutralization, metal oxidation, thermite reactions, more active metal and acid reactions, and reactions from unstable substances to stable substancesMost chemical reactions are exothermic. Most decomposition reactions are endothermic.

According to the relationship between the total energy possessed by the reactant and the total energy possessed by the product:

The total energy of the reactant is higher than the total energy of the product, and the reaction is exothermic.

The total energy of the reactant is lower than the total energy of the product, and the reaction is endothermic.

Hydrogen and chlorine gas synthesis reaction:Chlorine gas is prepared in a fume hood, and the mouth of the empty small plastic bag is tied to the trachea pipe of the chlorine generator with a thin wire Rotate the piston of the separating funnel to make concentrated hydrochloric acid enter the round-bottom flask containing manganese dioxide and heat it slowly.

When it is observed that the small plastic bag is gradually rising and the yellow-green gas in the bag is about half of the volume of the small plastic bag, stop the heating, pinch the mouth of the bag, tie the plastic bag tightly on the outside of the catheter with a thin wire, untie the thin wire tied to the catheter, and remove the gas collection plastic bag.

Common exothermic reactions:

1) All combustion or ** reactions.

2) Acid-base neutralization reaction.

3) Most of the chemical reactions.

4) The reaction of active metals with water or acid to form H2.

5) Many redox reactions (but not absolute). Typical exothermic reactions such as hydrogen, charcoal or carbon monoxide to copper oxide are typical.

6) NaOH or concentrated sulfuric acid dissolved in water (note: these two points only say that they will be exothermic, but strictly speaking, they are not considered chemical reactions, and should be paid attention to during the exam).

Common endothermic reactions:

1. Most decomposition reactions:

CaCO3 = (high temperature) CaO+CO2

The relative magnitude of the total energy of the reactants and the products of the endothermic reaction.

The relative magnitude of the total energy of the reactants and the products of the endothermic reaction.

CuSO4·5H2O=CuSO4+5H2O2, salt hydrolysis reaction.

3. Ionization.

4) A small number of chemical reactions.

c(s) + CO2 (g) = (high temperature) 2CO

i2+h2=2hi (this reaction is reversible because the generated hydrogen iodide is unstable) (5), other:

2nh4cl（s）+ba（oh）2·8h2o（s）=bacl2+2nh3↑+10h2o

c + H2O (g) = (high temperature) CO + H2

Summary. Hello dear, because chemical reaction exothermic refers to the reaction that converts chemical energy into heat energy (internal energy), so the temperature rises. Whereas, before the reaction, the energy is stored in the reactants in the form of chemical energy, and the chemical energy is not the internal energy, so the temperature cannot be increased, whereas after the reaction, the chemical energy is converted into internal energy, so the temperature increases.

Why do chemical reactions be exothermic? On the contrary, the reaction temperature increases.

Hello dear, because chemical reaction exothermic refers to the reaction that converts chemical energy into heat energy (internal energy), so the temperature rises. Whereas, before the reaction, the energy is stored in the reactants in the form of chemical energy, and the chemical energy is not the internal energy, so the temperature cannot be increased, whereas after the reaction, the chemical energy is converted into internal energy, so the temperature increases.

Relationship between internal energy and chemical energy.

Internal energy is the sum of the potential energy and kinetic energy of the thermal motion of the molecule, and chemical energy is the bond energy that exists and is not manifested in the potential energy of the chemical substance, mainly the chemical bond. These two energies can be converted into each other, but they are not completely different energies.

Question 1: Is the oxidation reaction endothermic or exothermic? If you think, burning paper, burning anything (except cooking vegetables) is an oxidation reaction, and the oxidation reaction must be exothermic.

Question 2: Is the redox reaction endothermic or exothermic Redox is not necessarily related to endothermic and exothermic.

For example, the combustion reaction is exothermic (carbon combustion), and the reaction of active metals with water or acid to produce hydrogen is also exothermic (sodium and water), which is both a redox reaction and an exothermic reaction.

Some reactions, although exothermic but not redox, such as neutralization (acids and bases).

Question 3: Is it right or wrong that oxidation reactions will be exothermic? The idea that oxidation reactions are exothermic is wrong.

All combustion, slow oxidation, thermite reactions, acid and active metal reactions are exothermic redox reactions.

All non-combustion redox reactions with the participation of carbon and hydrogen are endothermic reactions. For example, hydrogen reduces copper oxide.

Question 4: Are redox reactions exothermic Are redox reactions exothermic reactions? No, e.g. C+CO2=2CO (high temperature) is an endothermic redox reaction.

How do you think it has wood and exothermy?

Most are remembered according to the type of reaction, and a few exceptions are remembered in particular.

Common exothermic reactions:

All combustion (including incomplete combustion) nail neutralization reactions.

Reaction of metals with acids and water.

Most of the chemical reactions and displacement reactions.

Slow oxidation reactions such as rusting.

Common endothermy: 1. Most decomposition reactions 2. Ammonium salt and alkali reactions 3. Reaction of carbon as reducing agent.

Question 5: Is redox reaction endothermic and exothermic All chemical reactions have a change in heat, and redox reactions also have endothermic reactions and exothermic reactions.

Question 6: Is Iron Rust Endothermic or Exothermic Why Exothermic, most chemical reactions are exothermic reactions.

Hello dear, <>

Electrooxidation reactions can be either endothermic or exothermic, depending on the specific reaction process and reaction conditions. Some electrooxidation reactions require the absorption of heat to proceed, and such reactions are called endothermic reactions. For example, the electrolysis of water to produce hydrogen and oxygen is an endothermic reaction.

In this reaction, the electrolyzed water needs to absorb energy to break down into hydrogen and oxygen. The other part of the electrooxidation reaction will release heat, which is called the old heat reaction. For example, the reaction of zinc with an acid solution to produce hydrogen is an exothermic reaction.

In this reaction, zinc releases a large amount of energy when it reacts with an acid solution, which is released in the form of heat and hydrogen. Therefore, it is not possible to generalize whether the electrooxidation reaction is endothermic or exothermic, and it needs to be analyzed on a case-by-case basis. Burn early.