共查询到18条相似文献,搜索用时 78 毫秒
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以江苏省普通高中学业水平化学实验考试为例,对高中化学实验考试的现状进行反思,分析实验考试在组织、设计、实施以及效度上存在的问题,对促进学生创新精神和实践能力发展的实验考试设计提出一些建议。 相似文献
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多年来上海市实验操作考试的实际情况表明,考生和老师对这项举措并不满意,操作考试的效果并不理想。为此,本文提出了3点建议:将实验操作考试纳入学校常规考试中,实施可操作性实验操作考试量化考核表,以及建立学生实验档案袋制度。 相似文献
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指出了传统“化学实验考试”存在的不足,以案例的形式分析了化学实验考试改革理念、方法、技巧和创新点,推荐了一种“无机化学实验考试”的新模式。 相似文献
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以基础元素"化学实验考试改革"一例,呈现了案例中蕴含的化学实验考试改革理念、方法和技巧,指出了过去的"化学实验考试"存在的缺陷和改革后的"化学实验考试"所具有的创新点,推荐了一种关于基础元素"化学实验技能考试"的新模式。 相似文献
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介绍了GCE A-Level化学实验考试的制度、要求、内容,对部分试题进行了详细地评析,分析了GCE A-Level化学实验考试制度对于我国化学新课程改革的借鉴意义。 相似文献
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介绍了英国GCE化学A-level实验考试,包括化学实验教学目的、评价目标、评价方案以及考试内容,剖析了A-Level实验考试特点,以期对我国新课标下的高中化学实验教学改革提供一些可借鉴的信息。 相似文献
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The idea for designing organic chemistry lab for the 11st National Undergraduate Chemistry Lab Tournament was introduced. The problems found in the competition were illustrated and the test results were analyzed. 相似文献
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Hexa-Coordinate phosphorus Chemistry and Life Chemistry 总被引:1,自引:0,他引:1
ZHAO Yu-Fen YIN Yin-Wu LI Yan-Mei TAM Bo Department of Chemistry Tsinghua University Beijing 《有机化学》1993,(2)
The amino acids' side chains were acting as the relay device to regulate the chemical reactivi-ties of the N-phosphoryl amino acids. These modulation effects were performed through the partici-pation of the phosphoryl group. 相似文献
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The experimental test and design ideals of physical chemistry experiment for the 1st chemistry experiment competition of Fujian undergraduates were introduced. The evaluation rules of the contest, the problems found in the competition, and the analysis of the results were also presented. 相似文献
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On the Chemistry of the Resveratrol Diastereomers 总被引:5,自引:0,他引:5
Summary. The (E)- and (Z)-diastereomers of resveratrol were investigated with respect to their photochemical and thermal diastereomerization reactions.
The free enthalpy difference between the two diastereomers was estimated to be in the order of common stilbenes, with the
(E)-diastereomer more stable by about 11–14 kJ mol−1. The Arrhenius activation barrier of about 280 kJ mol−1 was found to be quite high and implies that thermal equilibration cannot account for the (Z)-diastereomer found in nature. A preparative access to the (Z)-diastereomer by photodiastereomerization is described. The 1H and 13C NMR spectra of the two diastereomers were assigned and their absorption spectra and fluorescence quantum yields of the neutral
and monodeprotonated species were determined.
Corresponding author. E-mail: heinz.falk@jku.at
Received October 15, 2002; accepted November 7, 2002
Published online February 20, 2003 相似文献
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绿色化学原则在发展* 总被引:3,自引:0,他引:3
从源头上减少或消除化学污染是绿色化学的理想,而绿色化学原则是对绿色化学内涵的最好诠释。自Anastas等人在1998年提出12条绿色化学原则以来,Anastas本人和Winterton又从技术、经济和商业等角度出发,分别提出了另12条绿色化学补充原则。但这些原则中缺乏清晰地反映与环境影响高度相关的概念,绿色工程的概念和绿色工程原则由此应运而生。Tang等人随后将Anastas等人提出的绿色化学原则和绿色工程原则简化为“IMPROVEMENTS PRODUCTIVELY”中字母表示的24条原则,以便于记忆、交流和推广。然而,上述原则主要是直觉和常识的结晶,难以清晰地反映绿色化学的目标和相关研究领域的内在联系。预计,从绿色的认定,原子经济性和有效质量收率等的兼顾,生命周期评价数据的采集,催化剂的性质及其反应、分离和循环使用的一体化以及绿色程度评价指标和评价方法的优化与平衡等几方面发展和凝炼绿色化学原则将是长期的研究课题。 相似文献