众文网1.化学论文300字
题目：对蜡烛及其燃烧的探究
关键词：蜡烛，燃烧
正文：
前言：蜡烛是由石蜡和棉线烛芯组成的，本实验将对一支蜡烛在点燃前，燃着时和熄灭后的三个阶段进行观察。
主体与讨论：
一.一般情况下为固体，颜色各异蜡烛，有轻微刺鼻气味，熔点较低，密度小于水且难溶于水。我们看到的蜡烛燃烧并不是石蜡固体的燃烧，而是点火装置将棉芯点燃。现在蜡烛的主要原料是石蜡，石蜡是从石油的含蜡馏分经冷榨或溶剂脱蜡而制得的，是几种高级烷烃的混合物，主要是正二十二烷和正二十八烷，含碳元素约85%，含氢元素约14%。添加的辅料有白油，硬脂酸，聚乙烯，香精等，其中的硬脂酸主要用以提高软度，具体添加要视生产什么种类的蜡烛而定。
二.二氧化碳可以使澄清的石灰水变浑浊。二氧化碳能使澄清石灰水变浑浊是因为二氧化碳与石灰水中的溶质氢氧化钙反应生成难溶于水的碳酸钙的缘故，即CO2+Ca(OH)2=CaCO3↓+H2O。
实验报告
实验名称：对蜡烛及其燃烧的探究
实验日期：2010年2月18日
实验目的：探究蜡烛的性质和变化
实验仪器和药品：蜡烛，火柴，玻璃杯
实验步骤及现象：
1.观察外表：蜡烛由石蜡和棉线烛芯组成，无色，固体，无气味，较软，熔点与沸点低，能燃烧，密度比水小。
2.点燃蜡烛：
(1)火焰分三层，冒黑烟，石蜡受热熔化，发光，放热。取一根火柴梗，拿住一端迅速平放入火焰中，约1秒后取出，火柴梗中间烧伤程度弱（呈白色），两端烧伤程度强（呈黑色）。
(2)分别取一个干燥的烧杯和一个用澄清的石灰水湿润内壁的烧杯，先后罩在蜡烛火焰的上方，干燥的烧杯内壁呈黑色，有小水珠，用澄清的石灰水湿润内壁的烧杯内壁的澄清的石灰水变浑浊。
3.蜡烛熄灭：熄灭蜡烛，冒白烟。
实验结论：
1.蜡烛是固体。
2.焰心温度最低，没有完全燃烧；外焰温度最高（物质加热处）；内焰温度较低。
3.蜡烛燃烧生成了水和二氧化碳。
4.白烟是石蜡蒸汽。
实验评价与讨论：
这是一个难度不大、不需要专业仪器、每个人都可做的生活实验。它惟一需要的是平静的心态和仔细的观察，而不是很深的理论知识或者过硬的实验操作水平，而且有着广泛的应用前景。
通过对蜡烛及其燃烧的探究，提高了我提取知识和分析问题的能力，使我对化学产生了更大的兴趣。
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2.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。
3.大学时化学师范专业要学什么
一、高校化学师范专业培养目标：系统学习和掌握化学基本理论和基本实验技能，具有宽厚、扎实的学科基础和人文素养，掌握教育理论和技能，了解化学学科的最新发展动态，接受科学思维和科学实验的训练，具备良好的创新意识和分析解决问题的能力，培养一流的中学化学教学、化学教育研究的师资以及其它教育工作者。
二、主要课程：高等数学、无机化学、无机化学实验、有机化学、有机化学实验、分析化学、分析化学实验、仪器分析、仪器分析实验、物理化学、物理化学实验、结构化学、化工基础、化工基础实验、中学化学课程与教学、中学化学教学与实验基本技能训练、中学教育概论、中学生发展、班主任工作、中学教育实习、毕业论文等必修课程，以及化学信息学、化学专业英语、高等无机化学、高等有机化学、高等分析化学、高等物理化学、配位化学、应用电化学、胶体化学、生物化学、有机合成（含实验）、环境化学、中级化学实验、化学教育统计与测量、教育伦理学、学校德育原理等专业选修课程。
三、学生就业去向：毕业生可以胜任中学及其以上学校的教学工作，并尽快成长为教学和教育研究的领跑者；也可从事与化学及其相关领域有关的教学、科研及管理培训工作。
四、课程的难度：因人而异，如果有兴趣去学，即使难也觉得是乐趣；如果没有兴趣，即使再简单也是负担。所以建议去各个大学的贴吧跟大学的学哥学姐讨论一下。
4.·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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