Is the common decomposition reaction heat releasing? Why isn't it heat absorbing?
Most of the common decomposition reactions were mostly thermal reactions rather than xenothermic reactions. From the perspective of chemical bonds, the essence of a chemical reaction was the breaking of old chemical bonds and the formation of new chemical bonds. The breaking of chemical bonds was an heat-absorbing process, while the formation of chemical bonds was an exhalation process. The decomposition reaction was a reaction in which one substance reacted to produce two or more new substances. In this process, more energy was needed to break the chemical bonds of the original substance, and the energy released by the chemical bonds of the new substance was relatively small, so most decomposition reactions were heat-absorbing reactions. For example, CaCO3 =(high temperature) CaO + CO2, CuSO4·5H2O = CuSO4 + 5H2O and other decomposition reactions are all heat absorbing reactions. However, there are also a few decomposition reactions that are heat release. For example, the decomposition reaction of nitrogen is heat release when it is heated or exploded by impact: 2NH4NO3 = 2N2 + O2 + 4H2O. Therefore, it could not be said that the decomposition reaction was either heat absorbing or heat releasing. However, in general, the common decomposition reaction was heat absorbing. Read more exciting novels for free
Is the weak acid reaction heat-absorbing or heat-releasing?
It was too general to say that the weak acid reaction was either heat absorbing or heat releasing. For example, the weak acid's ionisation process was heat absorbing. This was because the weak acid needed to overcome the effect of chemical bonds to absorb energy when it was ionised. However, if a weak acid is involved in the neutralizing reaction, since the weak acid is not completely ionised, it absorbs heat during the neutralizing reaction at the same time. Therefore, the heat released by the neutralizing reaction of the weak acid and the strong base (or strong acid) is less than the neutralizing heat of the strong acid and strong base neutralizing reaction.(The neutralizing reaction of a diluted solution of a strong acid and base: H+(aq)+Oh-(aq) H2O(l); AH = -57.3kJ/mole), but the whole reaction was still an exothermic reaction, but the heat released was less than that of a strong acid and base neutralizing reaction. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Is liquid vaporizing heat absorbing or releasing heat?
Liquid vaporizing was an heat-absorbing process. In this process, the liquid molecules would change from the liquid surface or the interior to the gaseous molecules, which required energy consumption. Therefore, it would need to absorb heat from the outside world. For example, the drying of wet clothes and the turning of water into steam were all phenomena of liquid vaporizing. These processes were accompanied by the absorption of heat. The novel " Watching the Moon on Fish Island " is equally exciting. Everyone is welcome to click and read it!
Is the reaction between the sulfuric acid and the sulfuric acid heat absorbing or heat releasing?
The reaction between the sulfuric acid and the sulfuric acid was an exothermic reaction. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Does the decomposition reaction release heat and the combination reaction absorb heat?
Most of the chemical reactions were exothermic, because the chemical reaction was a bond formation process, and the bond formation process was exothermic. However, there were also some chemical reactions that were xenothermic, such as C + CO2 = 2CO2. Most of the decomposition reactions were heat-absorbing reactions because the process of the decomposition reaction was a bond breaking process, and the bond breaking process was an heat-absorbing process. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Which one is the heat absorbing reaction, the oxidization reaction or the reduction reaction?
Oxidation and reduction reactions occurred simultaneously in a single oxido-reduction reaction. It could not simply be said that either of the reactions was heat absorbing. Oxidation-reduction reactions could be both heat absorbing and heat releasing. For example, the combustion reaction was an oxido-reduction reaction and was an exhalation reaction, while the formation of water gas was an absorption reaction. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Liquefaction is heating or releasing heat
Liquefaction referred to the process of a substance changing from a gaseous state to a liquid state. This process would release heat to the outside world, not heat. For example, the " white gas " seen at the spout of the pot after boiling water was the phenomenon of the water vapor vaporized from the pot meeting the cold air and liquefied into small misty water droplets. During this process, the water vapor released heat. Another example was the indoor heating pipe in the north in winter, which was filled with hot water vapor to keep warm. In the end, water was recovered at the other end of the pipe, because the water vapor liquefied into water and released a lot of heat. The novel " Watching the Moon on Fish Island " is equally exciting. Everyone is welcome to click and read it!
reaction heat exchange
The reaction heat exchange was also known as the heat exchange reactor, and its structure was mostly similar to the shell-and-tube heat exchange. The catalyst could be placed in the tube or between the tubes, but it was rare to place it between the tubes. In a heat-exchange fixed-bed reactor, the gas flows from the top of the reactor down into the catalyst bed and flows out at the bottom. In actual production, this top-down flow method is mostly used. For the heat-exchange tube reactor, the reasonable choice of heat carrier was the key to control the reaction temperature and maintain the stable operating conditions of the reactor. The temperature difference between the heat carrier and the reaction temperature of the bed should be small, but it must be able to take away the heat released by the reaction. This required a large heat transfer coefficient under the condition of a certain heat transfer area. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
How do you look at the reaction? Is it heat or heat?
There were several ways to determine whether the reaction was an exhalation or an absorption: 1. According to the energy relationship between the reagent and the product, if the total energy of the reagent is higher than the total energy of the product, the reaction is an exothermic reaction; if the total energy of the reagent is lower than the total energy of the product, the reaction is an xenothermic reaction. 2. According to the bond energy, it could be judged that the total bond energy of the reagent minus the total bond energy of the product. If the total bond energy of the reagent was greater than the total bond energy of the product, then the reaction was an heat absorbing reaction. If the total bond energy of the reagent was less than the total bond energy of the product, then the reaction was an heat absorbing reaction. 3. According to the basic types of chemical reactions, the reactions of acid and base, most of the displacement reactions, and most of the chemical combination reactions were all exothermic reactions. Most of the decomposition reactions were also the thermal reactions. The reactions of salt decomposition and dissolution were also the thermal reactions. However, this method of judgment could not be absolute. For example, the decomposition of kClO4 to produce kCl4 and oxygen was an geothermal reaction, and the transformation of lead to diamond under high pressure was an geothermal reaction (the opposite was true under normal pressure). 4. According to whether the reaction process required continuous external force, most of the exothermic reactions could be carried out spontaneously without continuous external force (such as light, electricity, etc.), but there were also exothermic reactions that required ignition or heating to occur (such as the reaction of hydrogen and oxygen to form water). There were also situations where the reaction could be carried out spontaneously without continuous external force, such as the reaction of lithium bis (bis). However, it was not possible to determine whether the reaction was an exhalation or an absorption simply based on whether an external force was needed. 5. According to the stability of the substance in the reaction, the reaction of forming an unstable substance from a stable substance was an alcoholic reaction, and vice versa. In addition, it was important to note that the dilute of concentrated sulfuric acid, the dissolution of the solid in water, and the heat absorption of the solid in water were not chemical reactions, nor were they in the scope of the heat absorption reaction or the heat release reaction. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Isn't the heat of formation of the product equal to the heat of reaction?
The heat of reaction refers to the heat released or absorbed by a chemical reaction under constant pressure and without any non-expansion work. If the temperature of the product returns to the initial temperature of the reagent, the system will release or absorb heat. The heat of formation was a form of chemical reaction heat. Therefore, the heat of formation of the product was only a special case of the heat of reaction, and the two were not equal. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
supersonic heat reaction equipment
The working principle of the ultrasonic heating reaction equipment was that the energy-gathering ultrasonic horn was directly immersed in the reaction liquid of the reaction kettle, and a large amount of energy was directly transmitted to the reaction medium, effectively transforming the electrical energy into mechanical energy or ultrasonic energy. The ultrasonic energy could be controlled by changing the amplitude of the ultrasonic wave transmitted to the probe through the ultrasonic generator. For example, the Voshin - 1200 UIG high-pressure and high-temperature ultrasonic reactor was commonly used in laboratory extraction and chemical reaction research. It solved the problem of sealing the horn and the reactor. It could also be equipped with various chemical reactor accessories at high temperatures to achieve the reaction system atmosphere isolation and vapor condensation. There were also related ultrasonic heating machines available on the market. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>