Why don't we use the solid state to represent the reaction rate?
The concentration of the solid was regarded as a constant. Changing the amount of solid had no effect on the chemical reaction rate, so the reaction rate was not expressed by the solid. In addition, the chemical reaction rate is usually expressed by the change in the concentration of the reagent or the product in a unit of time. The particles in the solid are tightly interlocked and are not easy to move, so their concentration in the reaction is constant. For reactions that involve solid, the chemical reaction rate is generally not expressed by the solid. The chemical reaction rate is related to its surface area, and has nothing to do with the amount of substance. Read more exciting novels for free
Why can't the reaction rate be calculated in solid state?
The concentration of the solid was regarded as a constant. According to the reaction rate calculation formula v = Delta c/Delta t (v is the average rate, Delta c is the concentration change, and Delta t is time), since the concentration of the solid was constant, the concentration change was zero, so the reaction rate of the solid could not be calculated by conventional methods. Moreover, when reacting between solid substances, the contact area between the molecules of the reagents was small, unlike in solution where the contact between the molecules of the reagents was sufficient and the chance of the molecules meeting was small. The reaction rate was slow and difficult to calculate using the conventional reaction rate concept. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The definition of solid-state reaction
The solid-state reaction was a process in which different metals or compounds reacted through solid-state inter-dispersion. It was mainly used to prepare non-crystalline films or non-crystalline powders. Unlike liquid and gas reactions, it relied on the shape and transportation properties of the solid, involving the flow and reaction of substances in the crystal. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
What is the average reaction rate of a solid?
The concentration of the solid was a constant and there was no rate, so there was no average reaction rate for the solid. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The Determination of Reaction Rate and Reaction Constant
The chemical reaction rate represented the speed of the chemical reaction, which was the rate of change of the reaction progress with time or the reaction progress of the chemical reaction in unit time and unit volume. The average reaction rate was the decrease of the concentration of the reagent or the increase of the concentration of the product in unit time. The instantaneous reaction rate was the limit of the average reaction rate that approached zero. The reaction rate constant represented the chemical reaction rate at a unit concentration. It was independent of the concentration, but it was affected by factors such as temperature, catalyst, and solid surface properties. Usually, the larger the reaction rate constant, the faster the reaction would proceed. There were two common methods to measure chemical reaction rates: chemical and physical methods. The chemical method used chemical analysis to directly measure the change in the concentration of the reagent or product over time to obtain the chemical reaction speed. However, the chemical analysis speed might not be able to keep up with the reaction speed and affect the measurement results. However, it could provide an absolute concentration value. The physical method was more extensive and convenient. It was to determine the reaction speed based on some physical properties that changed with the reaction, such as the pressure method, the distension meter method, or the volume method; the optical rotatory method, the interference method, the chromicity method, and the spectrophotosity method; and the electrical property method, such as the conductivity method, the potential method, the polarography method, the dielectrical constant method, and the mass spectrum method. As for the determination of the reaction constant, for example, in the experiment of determining the rate constant of the fading reaction by the method of the catalyst, based on the principle of the catalyst kinetic method, the reaction system of the fading reaction of the Evans Blue by the reaction of the potassium bromate under the action of the NaNO3 was proposed. The corresponding chemical reaction rate constant was calculated by measuring the change of the absorption of the reaction system at different initial concentration and temperature. In terms of specific operations, the stock solution of the relevant reagents was first prepared, and then the reagents were added into the color-measuring tube according to a certain order and dosage. The timing and volume were started, and then the absorption curve was measured. The reaction constant was determined by preparing reaction solutions of different compositions, adding the solution after reacting for a period of time to stop the reaction, and taking a sample to measure the absorption curve. Finally, the concentration of other components was maintained at a constant temperature, and the change of the light absorption with time when different amounts of the solution of bromate or the solution of NaNO3 were measured, as well as the change of the light absorption with time when the specific amount of the solution of NaNO3 was measured at different temperatures. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Reaction Rate Formula
1. For a chemical reaction, the reaction rate was calculated as: <<v>=<cC>(g)>+<dD>(g)>(v =<Delta c>/<Delta t>)(<v>: average rate,<<Delta c>>: concentration change,<<Delta t>>: time), in units of </(L·s)>. 2. For elementary reactions, the expression of the mass action law can be used as the reaction rate equation, the reaction rate equation, r = k(A)^a(B)^b, where k is the specific reaction constant (a quantity independent of concentration). 3. For the reaction,<aA(g)+bB(g)=cC(g)>, the reaction rate <v_positive = k_positive c^a(A)·c^b(B)>,<v_inverse = k_inverse c^c(C)>, when the reaction reaches equilibrium,<v_positive = v_inverse>, that is,<k_positive c^a(A)·c^b(B)=k_inverse c^c(C)>. 4. When the same reaction was expressed by different substances, the values might be different, but the meaning was the same. The reaction rates expressed by different substances had the relationship of [v(A): v(B): v(C): v(D)=m: n: c: d](the ratio of the rates was equal to the ratio of the measurement factors of the corresponding substances). <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Even after changing the solid-state drive, the reaction is still not fast. What's going on?
If the response is still not fast after changing the solid-state drive, there may be the following reasons: 1. ** Interface problem **: There are three types of interface for the computer motherboards, namely, SARA2, SARA3, and M.2. The different interface determines the read and write speed of the solid-state drive. For example, the read and write speed of the SARA3 interface could reach about 500mb/s, while the SARA2 interface could only reach about 300mb/s at most. If the solid state drive was not connected to a suitable port, the speed would be limited. For desktop computers, you have to check the instruction manual of the motherboards to find the correct interface; most of the optical drive slots in laptops are the SARA2 interface. If the solid state drive is installed here, it will limit the speed. It is recommended to install it in the original hard drive slot. In addition, for the M.2 interface solid-state drive, check whether the PCI-E channel and NvMe drive are supported and installed correctly, otherwise the speed advantage cannot be utilized. 2. ** Not Using the Solid State Disk as the System Disk **: If you originally had a Mechanical Hard Disk, but only installed the Solid State Disk, and did not re-install the system and use the Solid State Disk as the main disk, the operating system would still be on the original Mechanical Hard Disk, and the computer speed would not be significantly improved. And when playing games or using high-demand software, it had to be installed on the solid state drive partition to increase the speed. 3. ** 4K alignment not performed **: 4K alignment is required when the hard disk is reformat (the size of the hard disk sector is migrated from 512 to 4096). This can improve the efficiency of reformat and hard disk usage, thereby increasing the operation speed. You can operate it when reinstalling the system or use other software to perform 4K alignment. 4. ** Delay caused by garbage collection **: Most of the delay of the solid state drive is caused by the read and write delay of the flash memory. The garbage collection is a means to extend its life and reduce the number of reads and writes. However, there will be data migration and erasing operations during the garbage collection process. In the case of a random write of 4KB and a queue depth of QL = 1, the write delay may exceed 200ms, and the read delay may exceed 35ms. This will affect the read and write speed of the solid state drive and slow down the computer's response. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
First Order Reaction Formula of the Reaction Rate
The first-order reaction rate equation was: r = -dt/dt = kc, and its integral form was: Where, a is the concentration of the reagent at the beginning of the reaction, c is the concentration of the reagent at time t, and k is the rate constant. The unit is the negative power of the time unit, such as s^{-1}, min^{-1}, h^{-1}, d^{-1}, etc. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Is the reaction rate the same for different reaction levels?
The reaction order was closely related to the reaction rate. Under normal circumstances, the reaction rate would be different depending on the reaction order. The reaction order reflected the relationship between the reaction rate and the concentration of the reagents. It was the sum of the powers of the concentration of the various reagents in the rate equation. Different reaction orders meant that the concentration of the reagents affected the reaction rate in different ways and degrees. For example, the reaction rate of a zero-order reaction had nothing to do with the concentration of the reagent, the reaction rate of a first-order reaction was proportional to the first power of the concentration of the reagent, and the reaction rate of a second-order reaction was proportional to the second power of the concentration of the reagent. However, the reaction rate was also affected by other factors, such as temperature, catalyst, etc. Under certain conditions, even if the reaction order was different, it was possible that other factors affected the reaction rate so that the reaction rate of different reactions was the same at a certain time. However, this was a special case and not the normal case. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The Reaction Rate of the Reaction of Keto and Bihydrogen Sulphite
In the addition reaction of the carbonyl-like group of the acid, the reaction rate was different. Propional reacted the fastest with bisulfuric acid, followed by Cyclohexuron, methylethyluron, and dibenzone. Among the alkahedes, the reaction rate of the addition of formalin to the nucleus was the fastest. Because the hydrogen atom attached to the carbonyl-group was the smallest, the steric hindrance was the smallest, so the reaction was the fastest. Aldes, fatty methyls, and cycloketones with less than eight carbon atoms could undergo an addition reaction with saturated water-based bisulphite solution (about 40%). The reaction rate of different alkyls and methyls was different, which was related to the atoms or groups connected to the carbonyls. The smaller the steric hindrance caused by the atoms or groups, the faster the reaction rate. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Is the metal smelted by thermit reaction solid?
No, the metal smelted by the thermit reaction is not solid. In the thermit reaction, because the reaction would release a huge amount of heat, it was enough to make the resulting metal appear in a molten state (liquid state). <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>