众文网1.化学毕业论文中文摘要翻译
In organic synthesis because of some reaction of the synthesis by conventional hard to achieve the desired purpose or relatively complicated, so rearrangement is an effective way. Rearrangement reaction of high efficiency and high stereoselectivity. I passed a lot of relevant information available on the molecular rearrangement of the benzidine rearrangement reaction. To o-nitrotoluene as the raw material, after a two-step chemical reaction synthesis of 3,3 `- dimethyl benzidine: o-nitrotoluene in alkali zinc under conditions of 81 ~ 84 degrees Celsius in the range of 5 hours reaction, reduction of 2,2 `- DNPH; 2,2` - DNPH with 10% hydrochloric acid in the range of 0 to 5 degrees within two hours reaction, and then at room temperature (20 ~ 25 degrees) reaction 3 hours, to be `3,3 - dimethyl benzidine, a product for the gray solid, 45.5 percent yield.。
2.化学毕业论文中文摘要翻译
In organic synthesis because of some reaction of the synthesis by conventional hard to achieve the desired purpose or relatively complicated, so rearrangement is an effective way. Rearrangement reaction of high efficiency and high stereoselectivity. I passed a lot of relevant information available on the molecular rearrangement of the benzidine rearrangement reaction.
To o-nitrotoluene as the raw material, after a two-step chemical reaction synthesis of 3,3 `- dimethyl benzidine: o-nitrotoluene in alkali zinc under conditions of 81 ~ 84 degrees Celsius in the range of 5 hours reaction, reduction of 2,2 `- DNPH; 2,2` - DNPH with 10% hydrochloric acid in the range of 0 to 5 degrees within two hours reaction, and then at room temperature (20 ~ 25 degrees) reaction 3 hours, to be `3,3 - dimethyl benzidine, a product for the gray solid, 45.5 percent yield.
3.化学毕业论文摘要翻译
The actual state, hazards, and prevention and comprehensive treatment of "White Pollution"
Abstract: The invention of plastic bag brings people lots of convenience. However, with widespread use and lack of environmental awareness, plastic bags have generated some hazards to the life of human. Along with the development of economy, "White pollution" has been becoming a public nuisance. which negatively affect the sustainable development. China has employed various manners to prevent and treat it to return the green to earth again.
Key words:"White pollution", actual state in our country hazard, reasons of formation, prevention manners, comprehensive treatment
4.化学专业毕业论文摘要翻译
我是机器和人一起帮你翻译的，希望对你有所帮助 According to the law according to one - Bill, after one layer of thickness of wavelength, liquid is fixed, suck the luminosity proportional to density of the coloured material. This experiment is to formulate the serial sulphur base salicylic acid of pH4.5-4.8 copper solution by waiting for one Mole of serial laws to determine, among them the sulphur base salicylic acid and quantity of the copper ion and total material do not change, but one Mole of marks of the two is changed continuously. Measure the luminosity of sucking of this line of materials with the spectrophotometer. One Mole of marks sucks the luminosity as the ordinate as the abscissa with sulphur base salicylic acid, make the luminosity of sucking to make up and pursue. It is matching the composition of the thing to make up with sucking the solution of the luminosity with corresponding maximum. Calculate with relation that is sucked between the luminosity, apparent stability constant through the ionization degree, can get the apparent stable constant of copper sulphur base salicylic acid. It's time, it tests to be typical comprehensive, experiment of designing etc., it comprehensive volumetric analysis basic operation skill, spectral analysis, chemical literature consult method knowledge, have designing nature, probing into characteristic. It analyze volumetric analysis with modern instrument technology use for, determine steady constant to cooperate the thing, comprehensive volumetric analysis, spectral analysis, experiment are operated and the computer technology combine together. Thus improve students' practice ability in many aspects. Method of experiment this very simple fast, need complicated instrument can determine composition and form to cooperate thing Watch the constant of stabilizing. Offer certain reference material for cooperating with the research of the thing. Key word: Cooperate with things, make up, stabilize the constant apparently, wait for one Mole of serial laws。
5.求一篇有机合成方面的外文文献和翻译
p-C6H4[Si(CH3)3]2，分子式：C12H22Si2,CAS [13183-70-5],MW = 222.48, bp = 194~1950C, mp = 92~940C。
从较简单的化合物或单质经化学反应合成有机物的过程。有时也包括从复杂原料降解为较简单化合物的过程。由于有机化合物的各种特点，尤其是碳与碳之间以共价键相连，有机合成比较困难，常常要用加热、光照、加催化剂、加有机溶剂甚至加压等反应条件。1828年F.维勒由无机物氰酸铵合成了动物代谢产物尿素，数年之后H.科尔贝又合成了乙酸，从此有机合成化学获得迅速发展。有机合成大致分为两方面：①基本有机合成。包括从煤炭、石油、水和空气等原材料合成重要化学工业原料，如合成纤维、塑料和合成橡胶的原料，溶剂，增塑剂，汽油等，其产量几乎接近于钢铁的数量级。②精细有机合成。包括从较简单的原料合成较复杂分子的化合物，如化学试剂、医药、农药、染料、香料和洗涤剂等。20世纪70年代以后，有机合成的新领域迅速发展，如一些有一定立体构象的天然复杂分子的合成，一些新的理论和方法如反应机理、构象分析、光化学，各种物理方法分析手段的应用等方面的进展，尤其是分子轨道对称守恒原理的提出，对有机合成化学起着极大的推动作用。
6.化学毕业论文摘要翻译
The actual state, hazards, and prevention and comprehensive treatment of "White Pollution"Abstract: The invention of plastic bag brings people lots of convenience. However, with widespread use and lack of environmental awareness, plastic bags have generated some hazards to the life of human. Along with the development of economy, "White pollution" has been becoming a public nuisance. which negatively affect the sustainable development. China has employed various manners to prevent and treat it to return the green to earth again. Key words:"White pollution", actual state in our country hazard, reasons of formation, prevention manners, comprehensive treatment。
7.急求帮忙翻译化学毕业论文的摘要
This article studied chromium azure CAS-CTMAB the spectrophotometric method determination determination steel slag EDTA- alkaline solution to soak takes in the fluid the aluminum content, Al3+ and chromium azure S produces the red dual complex compound in the low-acid solution, biggest absorption wave length λmax=560nm, mole of absorption coefficient κ=4.0*104L•mol-1•cm-1.Reaction time Al3+ and chromium azure S, if joins includes the long carbon chain organic surface active agent, like bromination hexadecyl trimethyl ammonium (CTMAB).Then may form three Yuan complex compounds, its biggest absorption wave length to the long wave traverse (red shift), the mole of absorption coefficient increases 2~3 times, the determination sensitivity remarkable enhancement.Choice hexadecyl trimethyl bromination amine (CTMAB) increases the sensitive medicinal preparation as the aluminum and the chromium azure S color reaction, in an ethanoic acid sodium acetate cushion medium, when pH =5.0, this system has the biggest absorption peak in 615 nm, the aluminum content conforms to Lang in 0.0~25.0 μg/50ml scope Bo a birr law, correlation coefficient r=0.9998, regression equation y=0.098X-0.004, the method picks out limits is 0.005mg/L, apparent mole of extinction coefficient ε600 = 1.25 *105L•mol- 1•cm-1.This method does not need to use the expensive equipment, the coloration is keen, the stability is good, the operation is simple, can obtain the good accuracy and the accuracy.。
8.·化学专业毕业论文摘要翻译
According to according to Lambert - Bill law, when after wave length, liquid sheet thickness determination, the extinction and the colored material's density is proportional. This experiment is with and so on mole of series law carries on the determination, compounds pH4.5~4.8 the series sulfosalicylic acid copper solutions, the sulfosalicylic acid and the cupric ion total material's quantity is invariable, but both's mole fraction changes continuously. Determines this a series of material with the spectrophotometer the extinction. Take a sulfosalicylic acid mole fraction as the abscissa, the extinction is the y-coordinate, makes the extinction constitutional diagram. The solution composition which corresponds with the extinction maximum value is this preparation composition. Through between the ionicity and the extinction, the apparent stability constant's relations carry on the computation, may obtain the sulfosalicylic acid copper apparent stability constant. This experiment is the typical comprehensive nature, the designed experiment, it synthesized the volumetric analysis elementary operation eo skill, the spectral analysis, knowledge and so on chemical literature consult method, and has designed, the zetetic characteristic. It uses in the volumetric analysis and the modern instrumental analysis technology determining the preparation the stability constant, synthesized the volumetric analysis, the spectral analysis, the experiment operation as well as the computer technology unifies. Thus sharpens student's practical ability variously. This experiment's method is simple, fast, and does not need the complex instrument to be possible to determine the preparation the composition and the apparent stability constant. Provides certain reference for the preparation research. Key words: Preparation, composition, apparent stability constant, and so on mole of series law。
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