Why does changing the temperature of a chemical reaction change the rate of endothermic reaction so

The temperature rises, and exothermic and endothermic react.

but which is better for endothermic or exothermic?

It should be that the higher the temperature, the more heat can be absorbed, and the easier it is to absorb heat. But the more difficult it is to release heat, for example, 90 water can release heat at a temperature of 60, but when the temperature rises to 100, can it still release heat? It in turn also absorbs heat, so the temperature increases, and the endothermic reaction rate.

Big changes. Conversely, when the temperature is lowered, the rate of exothermic and endothermic reactions decreases, and the amount of heat that can be absorbed decreases, so the endothermic reaction changes greatly.

and exothermic reactions.

Lowering the temperature, which is advantageous for exothermic discharge, is less reduced than the endothermic reaction.

Because the temperature accelerates the movement of molecules, just like boiling water bubble gum is faster than cold water, but there are special cases.

Under the same conditions, the higher the temperature, the greater the rate of chemical reaction, which has nothing to do with the endothermic and exothermic of the reaction.

What has an effect is the subsequent reaction, as the reaction progresses, the temperature decreases and the chemical reaction rate decreases.

The increased temperature increases the reaction rate of both endothermic and exothermic reactions, but the endothermic reaction increases faster because the equilibrium shifts to the right.

In the endothermic reaction, the temperature is increased, and the reaction proceeds in the direction of the positive reaction, which is equivalent to increasing the concentration, and in the same way, if the temperature is reduced, the endothermic reaction rate will be correspondingly affected.

Whether it is endothermic or exothermic, the temperature is increased, and the reaction rate is increased!

The effect is: the higher the temperature, the faster the rate of chemical reaction.

When the concentration is constant, the temperature increases, the energy of the reactant molecules increases, so that a part of the molecules with lower energy becomes activated molecules, thereby increasing the number of activated molecules in the reactant molecules, increasing the number of effective collisions, and thus making the chemical reaction rate faster.

As the temperature increases, all reaction rates are accelerated, but the amplitude is different:

1. Every 10 degrees Celsius increase in temperature.

The rate is increased by a factor of 2 4.

2. If a reaction is reversible.

Then its endothermic reaction.

The direction is greatly affected by temperature, and the direction of exothermic reaction is affected by temperature.

Factors influencing the rate of chemical reactions:

Main factor: the nature of the reactant itself.

External factors: temperature, concentration, pressure, catalyst, light, laser, reactant particle size, contact area between reactants and anti-god jujube leakage in response to the sediment-like rock starvation.

The rate of chemical reaction is often not calculated by the difference between the forward and reverse reaction rates, but is studied based on the ratio of the change in concentration per unit time to the stoichiometry. The symbol is more difficult to hit, I will send ** to you.

In ordinary applications, the chemical reaction rate equation is generally obtained from the reaction rate equation. For non-primitive reactions, the rate equation must be determined experimentally.

Primitive reaction rate equation.

Secondly, the relationship between temperature and the rate of chemical reaction is not so simple, it is not linear.

The effect of temperature on the reaction rate is mainly manifested in the effect of temperature on the rate constant, and the degree of its influence can be calculated by the Arrhenius equation.

Arrhenius equation.

where k1k2 is the reaction rate constant at t1t2 and r is the molar gas constant. EA is the activation energy of the reaction, which is determined by the experiment (it will be given when doing the question).

The increase of temperature increases the activation energy of the reactants, so it is easy for chemical reactions to occur, but the reaction rate increases due to the increase of activation energy, whether it is a forward reaction or a reverse reaction. As for which reaction rate increases more, it depends on whether it is an endothermic reaction or an exothermic reaction.

In general, for every 10 degrees Celsius increase in temperature, the rate increases by 2 or 4 times. The rate of a chemical reaction is an indication of how fast a chemical reaction proceeds. It is usually expressed as the change in the concentration of reactants or products per unit time (reduction or value-added), and the reaction speed is related to the nature and concentration of the reactants, temperature, pressure, catalyst, etc.

I think you're completely confusing the kinetics and thermodynamics of chemical reactions. First of all, for a reversible reaction, both the forward reaction and the reverse reaction have their corresponding rates, and the temperature increases, both increase the reaction rate, that is to say, the rate of the positive reaction increases, and the rate of the reverse reaction also increases. But the problem of equilibrium movement can be taken into account, which is the thermodynamics of the reaction, and the rate of increase of the two is not consistent.

Obviously, "endothermy" means that heat needs to be obtained (internal energy), and "exothermic" is the release of internal energy. Physically, there are chemical changes in the substance, and no new substances are generated in the process, so the "endothermy" and "exothermic" directly reflect the temperature change of the substance, and the increase in temperature means the increase in internal energy. And during the chemical reaction, or because of the "reaction equilibrium equation."

When the total internal energy contained in the left molecule of the equation is less than the internal energy of the molecule on the right side, it is conceivable that this process must exist outside to give a certain amount of energy supplement, or this reaction is an "endothermic reaction", because the increase in internal energy of the product is used to "combine into a new molecule" instead of "increasing the temperature", the heat energy absorbed from the outside reduces the temperature of the reaction process, so it is "endothermic" The reaction is not accompanied by a "temperature increase" like a physical change. Conversely, exothermic reactions.

The process is accompanied by the "release of excess energy between the molecules participating in the reaction", and the internal energy released leads to an increase in the temperature of the reaction process.

Physically, "endothermic and exothermic" is the opposite of chemically "endothermic and exothermic reactions" and therefore "temperature changes".

Endothermic is, of course, a decrease in temperature and an increase in the exothermic temperature.

However, in some chemical reactions, although the reaction is exothermic, additional heating is required to initiate the reaction. After the reaction is initiated, the heat generated by the reaction can meet the heat required for the subsequent reaction.

When endothermy, it is the ambient energy that is transferred to the substance, so the ambient temperature decreases and the temperature of the substance rises (of course, it does not include that the energy is not converted into other energy, such as ammonium nitrate dissolved in water to absorb heat, and the temperature decreases because the energy of water is used to overcome the force between the solute molecules, which is to convert heat energy into chemical energy).

Physically, endothermic and exothermic are the conversion of energy forms without energy. Whereas, chemically endothermic and exothermic is the conversion between heat energy and chemical energy. That's the difference between the two

1) Raise the temperature, regardless of forward reaction or reverse reaction;

endothermic reaction, exothermic reaction; The reaction rate will be.

Speed, that's a basic principle.

It should be kept in mind. 2) When the temperature is raised, although endothermic and exothermic reactions.

The rates are increased, but the endothermic reaction rate increases.

Direction to move. 3) When the temperature rises to a certain level, the reaction rate will decrease.

This is the only case in secondary school chemistry, and that is enzyme-catalyzed reactions. Originally, the enzyme catalyzed the reaction rate.

The rate also accelerates with increasing temperature, but the enzyme belongs to the egg.

White matter, when the temperature is too high, can cause enzymes to change.

sex and lose its catalytic effect, so in this case.

The rate reaction will be reduced.

According to Le Chattle's principle, if the reaction temperature is increased, the reaction will proceed in the direction of reducing heat, and the endothermic reaction will proceed in the positive direction. When the temperature is lowered, the reaction proceeds in the direction of heat generation, i.e., the exothermic reaction proceeds in the forward direction.

But as long as the temperature rises.

The reaction rate will increase.

The first half of the sentence is correct, and the second half of the sentence is wrong.

Analysis: 1) Raise the temperature, regardless of forward reaction or reverse reaction; endothermic reaction, exothermic reaction; The reaction rate will be accelerated, this is a basic principle.

It should be kept in mind.

Hello. In addition to special chemical reactions, the reaction speed will increase when the temperature increases. As the temperature increases, the motion of the molecules intensifies, increasing the probability of collision, so the reaction balance rise rate increases.

However, for some reversible reactions, the forward reaction is exothermic and the reverse reaction is endothermic, although the speed of the forward and reverse reactions will increase after the temperature increases, the reverse endothermic reaction speed increases faster, so on the whole, it seems that the forward reaction has slowed down.

To sum up, as the temperature increases, the rate of chemical reaction increases, but the degree of acceleration is different. Hope.

The speed of exothermic reaction increases with the increase of temperature-opening degree ().

Speed up (correct answer).

Slow down. Not quietly.

The higher the temperature, the faster the rate of chemical reactions

When the concentration is constant, the energy of the reactant molecules increases when the temperature is raised, so that some of the molecules with lower energy become activated molecules, thereby increasing the number of activated molecules in the reactant molecules, increasing the number of effective collisions, and thus making the chemical reaction rate as smooth as faster.

As the temperature increases, all reaction rates increase. But the magnitude is different:

1. For every 10 degrees Celsius increase in temperature, the rate increases by 2 4 times the original rate.

2. If a reaction is reversible, then the chain direction of its endothermic reaction section is affected by temperature more than that of the exothermic reaction direction.

Factors influencing the rate of chemical reactions:

Main factor: the nature of the reactant itself.

External factors: temperature, ignition, concentration, pressure, catalyst, light, laser, reactant particle size, contact area between reactants and reactant state.

A chemical reaction is the process by which a molecule breaks down into atoms and the atoms rearrange and combine to form new molecules. In the reaction, it is often accompanied by luminescence, heating, discoloration, precipitate, etc., and the basis for judging whether a reaction is a chemical reaction is whether the reaction generates new molecules.

In the reaction, it is often accompanied by luminescence, heating, discoloration, and the formation of precipitates. The basis for determining whether a reaction is chemical is whether the reaction produces a new substance. According to the theory of chemical bonds, it can be judged whether a chemical reaction is based on whether there is the breaking of old bonds and the formation of new bonds in a change process.

From the perspective of activation energy, the high temperature, the reactant molecules absorb energy, and the activation energy required for the reaction is more likely to be converted into activated molecules, the number of activated molecules increases, chemical reactions are more likely to occur, and the reaction rate is naturally accelerated;

From the perspective of bond energy: chemical reactions need to break the bond first, and then form the bond, and the bond breaking needs to absorb heat, provide high temperature, make it easier to break the bond, and the reaction rate will naturally accelerate.

The general explanation is that it focuses on the perspective of activation energy and activation molecules.

When the energy is high, the chemical bonds are easy to break.