What is the reaction principle between flux and oxide-based alloys?
The active molecules in the flux react with metal oxideto form 'salt'. Through this reaction, the metal oxideis removed. During this process, the active molecules in the flux's own solution will also react with the solders. The surface active agent in the flux can reduce the surface tension of the liquid solders on the surface of the materials to be soldered, so as to strengthen the mobility and spreading ability of the liquid solders, ensure that the tin solders can penetrate into every fine welding gap, and accelerate the reaction between metal elements. Thus, the progress of the entire welding process was increased. Read more exciting novels for free
Principle of Allergen Reaction
Allergy reactions are caused by some people being overly sensitive to the substances (allergens) they come into contact with. When a sensitive individual comes into contact with a foreign, harmless substance (an allergy), the immune system will overreact and the body will produce a type of protein specific to the allergy. These IgE-bound to the high-affinity receptor on mast cells and basophils. When the allergy entered the body again and met with these bound molecules, the form of the immune receptor would change from a dimmer to a monolith. This change in form would lead to the exposure of the protein sites of the relevant signaling pathways, which would activate the downstream signaling pathways, causing allergic reactions such as vasodilation and bronchiectomy. In severe cases, it could cause allergic shock. In an allergic reaction, the affected organs or tissues will be infiltrated by a large number of inflammatory cells (especially those that are not activated), and a high concentration of IgE will appear in the serum. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Reaction Diagram Analysis of Flux and Gold Plating
When analyzing the reaction mechanism between the flux and the gold plating layer, it was necessary to consider the situation of different bottom gold plating. For the mainstream method of nickel-based gold plating, during the welding process, the actual welding layer was related to the bottom layer of nickel-based alloy, that is, the tin alloy and nickel-based alloy formed a metal compound (Sn-Ni <2> compound). However, the purity of the gold-plated layer, the rate of voids, and the cleanliness of the surface directly affected the solderability of the contact body. When there was a nickel-plated bottom layer, the inertia of the nickel-plated part was higher than that of the gold-plated part, which could ensure a higher resistance to atmospheric corrosion. During welding, the flux and the bottom layer of nickel-plated part would have a smelting reaction, and the gold-plated layer might affect the welding process due to its own characteristics, but it was not the main reaction layer. As for the gold plating on the copper base, the copper base had a certain role in the welding. The copper ions easily penetrated into the gold coating and caused the gold coating to change color. Moreover, the copper coating was easy to be deactivated in the air and affected the cohesion of the gold coating. When the flux was in contact with the gold-plated layer of this structure, on the one hand, it had to deal with possible problems such as the possible oxidization of the copper surface to achieve good welding. On the other hand, the gold-plated layer was affected by the change of the copper layer and showed different solderability during welding. However, this method was rarely used at present. As for the silver plating, due to the lack of sufficient information, it was difficult to accurately analyze the reaction principle between the flux and it. It was only known that when the silver plating layer was contaminated, the black color would appear through the pores of the coating. This process was rarely used (except for special requirements). Generally speaking, when the flux was used in the welding process related to the gold-plated layer, it would be affected by the properties of the underlying metal under the gold-plated layer and the characteristics of the gold-plated layer (such as purity, voids, cleanliness, etc.). The reaction principle of the gold-plated layer and the flux with different underlying structures would have different performances in the welding process. The smelting change of the underlying metal during the welding was a more critical part, but the characteristics of the gold-plated layer could not be ignored. Under the joint action of many factors, the welding effect would be affected. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Biuret and protein reaction principle
The principle of the reaction between biuret and protein was that biuret could react with copper sulfuric acid to form a purple substance. This might be caused by the peptidic bond structure in the biuret molecules. The nitrogen atom of the peptidic bond would form a purple complex with Cu2 + ions. Because there was also a peptidic bond structure in the protein, such a reaction would also occur. We called the purple reaction between the compound containing the peptidic bond structure and copper sulfuric acid solution "biuret reaction". In other words, as long as the molecules contained a peptidic bond, this characteristic purple reaction would generally occur. It wasn't that biuret reacted directly with the protein, but the reaction between the peptidic bond in the protein and copper ions. It was the same reaction type as biuret and copper ions. It was a " biuret reaction." When carrying out experiments related to the biuret reaction, biuret reagent A was a strong base, and biuret reagent B was copper sulfuric acid. When using it, add A to the protein solution first, shake it up, and then add B. Strong base and copper sulfuric acid can denature the protein, but this does not affect the purple reaction, because the essence of protein degeneration is that the spatial structure is destroyed, causing it to settle and lose its physiological activity. However, the bond structure and the sequence of the protein chain are generally not destroyed. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Reaction Principle of Acid and Nitrite
The principle of the reaction between the two substances was that the reaction between the two substances would produce NaCl2, H2O, NO, and NO2. The reaction equation was 2NaNO2 + 2HQ = 2NaCl2 + H2O + NO + NO2. This was mainly due to the fact that the nitrogen acid was unstable and would decompose quickly. Moreover, nitrogen acid was a weak acid. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Reaction equation and phenomenon of arsenium oxide-dilute sulfuric acid
The reaction between the two could not be explained, as the reaction between the two was almost non-existent. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The Light Reaction Principle of Purple Light
The reaction principle of the purple light was as follows: The fluorescent reaction of a purple light lamp was based on the principle of luminescence. When a violet light (a violet flashlight) shone on certain substances, these substances would selectively absorb the violet light emitted by the violet light. The molecules would be stimulated, and they would emit visible light of the same wavelength and different intensity. When the light stopped, the fluorescence disappeared. When the infrared rays hit the fluorescent substance, there were three general situations: part of the infrared rays were reflected; part of the infrared rays were absorbed by the fluorescent substance; and part of the infrared rays were transmitted. The fluorescence occurred due to the absorption of the fluorescent substance. After the fluorescent substance absorbed the infrared rays, the internal energy state of the molecules changed, showing a transition between different energy levels and releasing fluorescence. For the Lighthouse series of purple lamps, the principle of light was to bombard the special fluorescent material inside the lamp with electric arcs after being energized, and then produce purple spectrum light waves. The violet light could be divided into the UUA band (320 - 400 <anno data-annotation-id ="00000100 - 400a-400a-400a-800a-8000000000000"> wave-length </anno>), the UVP band (275 - 320 </anno>), the UVP band (200 - 275 </anno>), and the UVR band (100 - 200 </anno>). Among them, the fluorescent powder in the purple tube could convert the arc energy into long-wave violet radiation in the UVA-band, such as the UVA-band of 340 - 380 run, and the UVA-band of 365 run was more suitable for checking the fine traces of the collection and fluorescent anti-counterfeit work. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Reaxff reaction force field principle
ReaxFF was a molecular force field based on bond level. It is commonly used in molecular dynamics simulations. Goddard and his collaborators at the California Institute of Technology suggested. In its simplest form, as a bridge between chemical quantum and the experiential force field, it used a set of relatively simple functions to describe the relationship between energy and geometry. For example, it used the EFF method to deal with the simple harmonic-wave equation of the condensed matter system. These equations were used to describe the stretching, compression, and bending of bond angles. However, the current reference materials did not have more in-depth information about its principle, so it was impossible to answer further. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Reaction Principle of Dehydrating Alcohol into Ether
The alcohol group was first protonated, and then the oxygen atom of the other alcohol group attacked the protonated carbon with a pair of electrons, causing an Sn2 reaction, and then deprotonated to give ether. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Principle and Phenomenon of the Reaction between Acid and Acid
The principle of the reaction between the two was that there was a lone pair of electrons in the nitrogen atom. When the nitrogen atom reacted with the acid, the lone pair of electrons of the nitrogen atom formed a coordination bond with the hydrogen ion in the acid to form an aminium salt. Take the reaction between hydrogen and hydrogen as an example. The reaction phenomenon is the production of a large amount of white smoke. The ion equation of the reaction was: [NH3 + H^+ = NH4 ^+]. From a microscopic point of view, the lone pair of electrons on the nitrogen atom in the nitrogen atom combined with hydrogen ions to form an amine ion. From a macro point of view, the reaction of the reaction of the formation of small white solid particles, dispersed in the air to form white smoke. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The meaning of tempering into steel and the principle of chemical reaction
"Tempered into steel" meant to become very strong after a long period of training. The principle of the chemical reaction was to use pig iron as raw material for smelting steel. The carbon content of pig iron was higher (2% - 4.3%), while the carbon content of steel was between 0.03% - 2%. During the smelting process, the carbon in the pig iron reacted with oxygen to form carbon dioxide (C+O <2>= CO <2>), thereby reducing the carbon content in the pig iron. The excess carbon and other impurities contained in the pig iron were converted into gas or slag to be removed. In this way, the pig iron was refined into steel.