手持技术在酸碱滴定中的应用研究

酸碱中和滴定是中学化学主要的定量实验，也是学生理解酸碱中和概念最直观的实验，但经常由于指示剂的选择与实验操作等问题而导致较大的实验误差。本文试图探讨在研究性学习中使用手持技术来判断中和滴定的终点，为酸碱滴定实验作一些探索，并对手持技术在化学研究性学习中的应用提出一些建议。     

教科书中“酸碱中和滴定”编写思路与特色分析

"酸碱中和滴定"是高中化学课程的重要内容。三种版本《化学反应原理》教科书"酸碱中和滴定"内容的编写思路各有特点。通过对三种版本《化学反应原理》教科书"酸碱中和滴定"内容编写思路与特色的分析,以期为中学化学教师教学提供参考。     

借用EXCEL图表向导 突破酸碱中和滴定难点

酸碱中和滴定是高考的热点问题之一，也是中学化学教学中的难点之一。尤其是学生对酸碱指示剂选择，以及滴定“突变”等知识的理解较为困难。为突破这一难题，笔者借助EXCEL表格中数据处理方法，编写简单的应用程序，运用多媒体进行教学，形象直观地展示了中和滴定过程中溶     

氯气的制取实验及其产物的综合利用——组合式绿色化学实验设计

氯气的制取是一个原子利用率很低且污染环境的实验。本文通过绿色化设计，将该实验与酸碱中和滴定和二氧化锰的回收组合起来，使之成为一个原子利用率很高、不污染环境且能回收资源的绿色化学实验。     

从“关键点”入手厘清解决问题的思路与方法——以高三“酸碱反应过程中溶液酸碱性变化”教学为例

酸与碱反应中溶液酸碱性变化涉及多种电解质离子间的相互作用,具有过程动态、微观抽象,体系复杂等特点,是学生学习的难点。以"氢氧化钠溶液不断滴入醋酸中溶液酸碱性变化"作为研究对象,从反应的起点、反应过程中溶液显中性时、恰好完全反应时等"关键点"入手,就溶液中溶质及微观离子间的相互作用展开分析,揭示酸碱中和滴定过程中溶液酸碱性变化这一宏观现象的微观内在本质,帮助学生厘清解决问题的思路方法。就相应的教学活动设计进行了探讨。     

酸碱滴定法中试剂浓度、指示剂与终点误差的分析

酸碱滴定法中试剂浓度、指示剂与终点误差的分析李英华，金丽萍，林燕（齐齐哈尔轻工学院）（齐市第十三中学）在酸碱滴定法中，通常利用指示剂的变色来确定滴定终点．但是，滴定终点与反应的等当点可能不一致，这样就必然带来滴定误差．这种滴定终点与等当点不相一致所引...     

Excel绘制化学实验中的二元合金相图步冷曲线

为了加快物理化学实验数据的处理速度,实现"二元合金相图"的自动化绘制,避免人为误差,提高相图绘制的准确性和重现性,发展了利用Excel绘制步冷曲线的方法.详细探讨了Excel绘制步冷曲线的过程和原理.结果表明:该方法操作简单,能够快速绘制二元合金相图步冷曲线,可以推广到其他实验数据处理过程.     

氧化还原滴定计算中计量系数分数的确立方法

滴定分析结果的计算中,氧化还原滴定结果的计算较为复杂。其所以复杂主要涉及计量系数分数,因此如何正确找出计量系数分数是解决氧化还原滴定结果计算的关键,本文通过例题合理地给出计量系数分数的寻找方法。     

"基本单元"在氧化还原滴定计算中的应用

本文阐述了运用基本单元这一概念在氧化还原滴定分析计算中的应用,可使计算简单明了,减少运算步骤.     

船用滴定管装置微量分析的研究

通过电位滴定分析和常规滴定管滴定分析,对船用滴定管装置进行了平行对比实验以及 对实验数据进行F检验和t检验。结果表明,船用滴定管微量分析有较好的精密度和较高的准确 度,并且具有操作简便等特点。     

Hamlet and His Revenge

The article introduces Shakespeare's tragedy "Hamlet".Hamlet wants to revenge for his father.But when the opportunity is coming,he delays his revenge.The passage analyzes the causes of his delay from Hamlet's characters.     

Cross Culture Communication——in Our Daily Life

Since the late 1960s,culture has been considered tighter with communication.Culture IS based on the community of communication.Communication involves people and their environment.Thus culture is an important factor in communication.Today with modem economic and technological development,intercultural communication is mole important than ever before. When people from different cultural background communicate with each other,their social stereotype pattern of behavior, their habits of language and thought differ from one another,because these are the possible factors that affect intercultural communications.Culture norms also change,culture may be transferred as signs but we have to study and understand the above carefially.     

A New Woman Image--Analysis of Jane Eyre''''s Character

The thesis mainly discusses the character of the heroine in Charlotte Brontes famous novel "Jane Eyre". There are three major parts-introduction,analysis which is the main body of the thesis,and conclusion.Jane Eyre,the heroine,is a new woman image who requires independence equality and freedom.The thesis just analyzes Janes these rebellious characters through four peroods of her experiences.First,in her childhood,she has shown her rebellious spirit.As an orphan,Jane suffers a lot of misery.Not only her aunt treats her cruelly,her cousins despise her,but also do servants have a prejudice against her.In Janes immature heart, she is unwilling to bear ill treatment.She rebels them bravely.Second,when she studies at Lowood,her rebellious spirit is exposed furtherly.Her view doest stay in Mrs Reeds,instead turns to the whole society.She makes hypocrisy of so-called charity to be discovered completely.At the same time,she declares her independent,equal rebellious thought to her friend-Helldn who endures oppression willingly.Third,she,as a governess in Thornfield Hall falls in love with Rochester-her master.During this period,her thought grows into maturity.Thought she loves him passionately,she never loses her dignity and independence for him.When she knows his mad wife still lives,she makes up her mind to leave him.For she doesnt want to become his mistress.Fourth,her refusal of St Johns proposal of marriage depicts Janes character.She knows John does not love her at all and his purpose of marriage is only to perform his great task missionary.Jane does want to become a sacrifice.She breaks traditional morality,then she goes back to Rochester.     

Using Context Clue in Reading

The context of a word consists of the other words surrounding it and the situation in which it is used.When we come across a new word in our reading,instead of looking it up in a dictionary for its definition,we can guess its meaning from its context.     

Cultural Factors in Reading

Introduction Whatisculture?Toputitsimply,culturemeansthe totalwayoflifeofaperson.Thissimpledefinitionimplies thatculturereferstothepattersofcustoms,traditions,socialhabits,values,beliefsandlanguageofasociety.As cultureissoinclusive,itincludesvirtuallyeverythingthat agroupofpeoplethink,say,doandmake.Followingthedefinitionofsociologists,theterm culturereferstothetotalpatternofbeliefs,customs,institutions,objects,andcharacterizesthelifeofhuman community.“Cultureconsistsofallthesharedproductsof …     

A Crying in the Dark

"Midnight"is a poem written by Archibald·Lampman,a Canadian poet,who loved nature very much,but his poor health prevents him from being very active in the outdoor life.So he is often the quite,thoughtful observer of nature in his poems.This article mainly talks about how to appreciate the poem in the following aspects:word selecting,rhyme,sentence structure and atmosphere.After reading this poem,we cannot get rid of the air of horror and mystery."Midnight" reveals another aspect of the nature:wild,rough and unknown.There is something else in the nature that can awe human beings even though we don't know what it is.     

痛定思痛：当代中国武术发展之缺失——刍议武术所缺乏宽容态度、自省精神、固守品质、稳定情感、真正说教与现代反思

当代中国武术经历了时代的沧桑和变迁,在历经了文化和历史的发展与洗礼之后,依然发展、繁衍至今。在这样一个漫长的过程中,伴随着以社会环境和社会人群价值取向为主的变迁与变化,当代中国武术的发展与当代社会的发展正逐渐的呈现出某些相背离和不和谐的表象。通过研究,我们发觉中国武术中原本一些内在的东西正在不断的被遗忘,正在不断的流逝。本文试从中国武术在当代发展中的问题境域入手,解读中国武术在当今世界和社会中存在的一些问题,希望能够从中找到中国武术发展的＂合法性＂或＂合时性＂的内在依据,以挺立中国武术的脊梁。     

An Analysis of English Carrie

Chapter Ⅰ Introduction Sitting in the rocking chair,Carrie dreams her future.This is the deep impression the novel"Sister Carrie"gives us,which is written by Theodore Dreiser(1871-1945),the great American realism writer.     

现阶段国内高水平青少年足球守门员防守基本技术运用分析

运用临场观察统计法、访谈法、文献资料法以及归纳法等研究方法,对现阶段国内青少年足球守门员防守技术运用情况进行统计与分析研究.结果表明:判断反应与选位能力不足是青少年守门员防守技术失误的主要原因,预判失误与技术粗糙以及缺乏自信等导致青少年守门员对抗条件下难以有效发挥位置优势,强干扰情况时出击争夺球失误多,重视反应训练和提高接球动作质量要求是提高青少年守门员技术水平的重中之重.