What kind of reaction type is the heat generated by friction?
The heat generated by friction was not a chemical reaction, but a physical phenomenon. When two objects rubbed against each other, they would overcome the force of friction and do work. The mechanical energy would be converted into internal energy, which would produce heat energy. This kind of energy conversion did not involve the change of the chemical composition and chemical properties of the substance. It was only the conversion of energy forms, so it was a physical phenomenon. Read more exciting novels for free
Exothermic means what heat is generated by the reaction
In an exothermic reaction, the total energy of the reagent was greater than the total energy of the product. During the reaction process, a portion of the energy would be converted into heat and released. Therefore, the reagent did not generate heat, but the energy of the reagent itself was converted into heat and released during the reaction process. This was because the essence of a chemical reaction was the breaking of old chemical bonds and the formation of new chemical bonds. The breaking of old chemical bonds absorbed energy, while the formation of new chemical bonds released energy. When the energy released by the formation of new chemical bonds was greater than the energy absorbed by the breaking of old chemical bonds, the excess energy was released in the form of heat, which was expressed as an regenerative reaction. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
How is heat a byproduct of friction?
Basically, friction works by creating resistance between the surfaces in contact. This resistance converts mechanical energy into thermal energy, which is heat. It's like when you rub your hands together fast 鈥 they get warm because of the friction. So, that's how heat becomes a byproduct of friction.
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>
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>
The relationship between reaction heat and heat release
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. When the heat of reaction is less than 0, it is an exhalation process, that is, the value of the heat of reaction is equal to the amount of heat released (at this time, the amount of heat released is positive); when the heat of reaction is greater than 0, it is an absorption process. At this time, the reaction absorbs heat instead of releasing heat. In short, the heat of the reaction was a representation of the amount of heat released (the values were equal, but the signs were opposite). <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Heat Reaction of Iodide and Amylum
Based on context alone At room temperature, there was no reaction between potassium iodate (Ki) and starch. However, if the mixture of potassium iodate and starch was heated under acidic conditions, a reaction would occur. Under acidic conditions, the ion equation of the potassium iodate is: 4I +4H + O 2 = 2I 2 + 2H 2 O. Iodine (I <2>) could turn the starch blue because it was embedded in the gaps of the starch's spiral structure, forming a blue clathrate. In general, the essence of the heating reaction between potassium iodate and starch was that the potassium iodate was first oxided to produce iodate, and then the iodate reacted with the starch. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Heat Reaction of Dibasic Acid
Oxalic acid was a dibasic acid. The two groups of the acid could be decarboxylated at a lower temperature to form formated acid and CO2. At a higher temperature, formated acid would undergo a dehydration reaction to form CO2 and water. The reaction equation was as follows: At lower temperatures: <<<p>></p>H - COOH + CO_2↑\); At higher temperatures: <br><br><br>> br><br>> br></br>>CO_2↑+ CO↑+ H_2O\)。 After the dibasic acid was heated, due to the different positions of the two carboxy groups, different chemical reactions such as water loss, loss of esh, or loss of esh at the same time would occur. At 300 ° C, the substituted dibasic acid could also undergo the above reactions. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Solar heat, physical reaction
The physical reaction of the sun's heat is nuclear fusion. In the high-temperature and high-pressure environment inside the sun, under extremely high temperature and pressure, the electrons outside the nucleus were freed from the constraints of the nucleus, and the nuclei attracted each other and collided with each other. To be specific, it was a reaction where four hydrogen atoms fused into one helium atom. This process would release a huge amount of energy, which was the principle of the sun's heat. According to the mass-energy equation E = MC2, the sun could emit a steady stream of light and heat by losing a little mass in this process. <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>
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>