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针对新建本科院校有机化学教学中存在的问题,结合详实的教学实例,提出了一些切实可行的提高教学效果的方法,包括抓住有机化学特点、经典例题详解、复杂问题简单化、多媒体辅助教学、引导学生自主学习、归纳总结教学内容。 相似文献
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多媒体辅助教学中存在种种误区,是新课程化学课教学中值得注意的问题。多媒体辅助教学要讲究科学,重在辅助,与常规教学手段之间关系是互补,而不是替代。要切实把握化学学科的特点,充分认识化学实验教学手段与功能是其他媒体和手段无法替代的,这对学生知识与技能的获得、过程与方法的体验都是十分重要的。多媒体辅助教学需要我们不断研究,扬长避短,把它与学科整合和转变学生学习方式作为核心任务。 相似文献
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山东省一些学校探究的"高效课堂模式"已引起了人们的广泛重视。人们对探索、研究"高效课堂模式"的目的、内涵、教师主导作用、学生主体地位、评价功能和多媒体辅助等方面,尚存在模糊认识。本文对高效课堂作进一步探讨。 相似文献
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探究学习活动实质上是让学生在做中学,不是辅助教师"灌输知识"的手段.新课程实施要努力提高探究学习活动的自主性、探究性和实效性.教师要尊重学生学习的主体地位,关注学生在学习上可能出现的问题,注意挖掘学习课题中蕴涵的科学方法、思维训练等教育因素,注意创设能引发学生发现问题、找到探究实验设计思路的真实情景,注意探究学习活动和其他教学环节的整合. 相似文献
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一本好的有机化学教材应该对教师教学和学生自学有很好的辅助和引导作用。如何使学生从浩如烟海的内容中发现重点、难点,并做到有效掌握和融会贯通,是教材编写者需要重点考虑的问题。笔者将教学经验融入到有机化学教材改革实践,在新版教材中加入了原创的“学习提示”板块,用简练、更通俗易懂的语言对一些重要、较难理解的或是容易混淆的知识点进行辅助讲解、串联总结。笔者认为该板块可以起到协助学生理解知识难点、厘清易混淆概念、将关联知识融会贯通以及激发学生科研兴趣等作用。本文用一些实例对这一模块的编写构思、内容和预期成效进行了介绍。 相似文献
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现代多媒体应用于化学理论性知识的教学,当今普遍存在的问题是呈现形式单一、密度过大、教学节奏把握不当及信息组织欠合理等,从而导致学生学习困难。基于以上问题提出了提高现代多媒体辅助理论性知识教学成效的多项建议。 相似文献
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利用手持技术改进测定乙醇分子结构实验 总被引:1,自引:0,他引:1
利用压强传感器代替排水集气法,改进测定乙醇分子结构实验的仪器装置,并探索最佳反应条件。另外,设计两个空白实验,结合压强变化曲线对实验误差进行相关讨论。 相似文献
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V. I. Bol'shakova L. I. Demenkova É. N. Shmidt V. A. Pentegova 《Chemistry of Natural Compounds》1989,24(6):691-694
The compositions of the neutral diterpenoids of the oleoresins of five species of conifers growing in the Transcarpathia have been studied. It has been found that the oleoresins ofAbies alba M.,Larix decidua M., andPicea excelsa L. contain more than 50% of neutral diterpenoids. The group and qualitative compositions of the oxygen-containing diterpenoids have been determined. In the oleoresins ofAbies alba,Picea excelsa, andPicea abies tertiary alcohols — cis-abienol and isocembrol — predominate, while inLarix decidua the main component is the hydroxy ester larixyl acetate. Primary alcohols related to the resin acids have been found in all the oleoresins investigated. Features of the distribution of diterpenoids according to the species of conifers have been revealed. The results obtained are necessary for the chemotaxonomy of conifers of the family Pinceae.Novosibirsk Institute of Organic Chemistry, Siberian Branch, Academy of Sciences of the USSR. Translated from Khimiya Prirodynkh Soedinenii, No. 6, pp. 812–816, November–December, 1988. 相似文献
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由于石化行业的生产需要,其材质的使用具有多样性和广泛性,经常会出现顾客委托的测试样品的一个或几个元素跨越光谱仪现有测试程序测量范围的情况。本法通过对光谱仪测试原理的认识,根据光谱仪的测试能力及标样的采集,实现了一个或几个元素测量范围的扩展,并对其测量的影响因素进行了研究。 相似文献
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The spectral-polarization characteristics of absorption and phosphorescence of molecules of the initial form of nitro-substituted
indolinospirobenzothiopyran were studied in oriented polyethylene films and in solutions with different polarity. An oscillator
model of the electron transitions responsible for the formation of absorption and luminescence spectra was suggested. It was
established that the principal differences in the spectral and photophysical properties of the compound studied and its oxygen-containing
analog are associated with the fact that the electronegativity of the S atom is lower than that of the O atom.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 6, pp. 1143–1146, June, 1997. 相似文献
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Influence of viscosity of medium on processes of oxygen quenching of excited states of mesoporphyrin
E. I. Kapinus V. A. Ganzha B. M. Dzhagarov E. I. Sagun V. B. Pavlenko 《Theoretical and Experimental Chemistry》1989,25(2):146-151
The oxygen quenching rate constants for singlet and triplet excited states of the dimethyl ester of mesoporphyrin IX increase with decreasing viscosity of the medium and reach a maximum at a viscosity of approximately 0.4 mPa·sec, after which the rate constants begin to decrease. The drop in rate constant with increasing fluidity of the medium may be related to a nonequilibrium character of the elementary act in the interaction of the reactants in the solvent cage. In viscous media such as isopropyl alcohol, isobutyl alcohol, and isoamyl alcohol, the reaction radius is greater than the sum of the radii of the reacting particles. The long-range character of these processes is due to the relatively weak dependence of the quenching probability on distance.Translated from Teoreticheskaya i Éksperimental'naya Khimiya, Vol. 25, No. 2, pp. 161–167, March–April, 1989. 相似文献
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