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. Read more exciting novels for free
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>
Solar terms that reflect the heat of summer
The minor heat and the major heat were solar terms that reflected the degree of heat in summer. The minor heat indicated the beginning of the heat, and the major heat indicated the extreme heat. The major heat was hotter than the minor heat, and it was the solar term with the fiercest and hottest sunlight in the year. The " hot and humid steam " reached its peak at this time. <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>
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>
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>
The most suitable reaction temperature for a reverse-heat reaction
In the case of a revertible thermal reaction, the chemical reaction constant was a positive function of temperature. The higher the temperature, the faster the reaction speed. However, increasing the temperature in a revertible thermal reaction had a contradictory effect. On the one hand, as the positive reaction proceeded, the system would release heat and the temperature would increase, and the reaction would speed up. On the other hand, the reverse reaction would also speed up as the temperature increased, which would weaken the positive reaction. Therefore, there was an optimal temperature at which the reaction rate was the greatest. This temperature was called the optimal temperature. In the case of the industrial synthesis of hydrogen, which was an example of a reversibility, from the perspective of increasing the reaction rate and increasing the content of hydrogen, the actual industrial production used a temperature of 400 - 500 ° C, and the iron catalyst was the most active at around 500 ° C. In addition, in order to make the overall reaction speed and conversion rate of the irreversible exothermic chemical reaction process fast, a temperature segment control scheme can be used to make it change according to the optimal conversion rate temperature curve trajectory. <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>
Is water absorption a chemical reaction or a physical reaction
Water absorption was usually a physical property that was reflected in physical changes, but some also involved chemical changes. For example, the solid state of soda ash had a strong moisture absorption. It absorbed the surrounding water vapor and dissolved in the absorbed water, forming a concentrated solution of soda ash. This process was a physical change. The concentrated sulfuric acid could absorb the water vapor in the air around it to form a series of water compounds. On the other hand, the concentrated sulfuric acid dissolved in the absorbed water to make itself thinner, which also involved physical changes. However, the concentrated sulfuric acid absorbed the first water molecules in the copper sulfuric acid, which reflected the water absorption (physical property), and the removal of the remaining four water molecules reflected the dehydration (chemical property). The main component of the quicklime drying agent was lime, and its water absorption ability was achieved through a chemical reaction. This water absorption was irreversible. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>