共查询到20条相似文献,搜索用时 46 毫秒
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2002年我们宜昌市成为全国课程改革实验区之一,笔者有机会接触到3种版本的初中化学教材:人民教育出版社九年义务教育三年制初级中学教科书《化学》(全一册)[下称“人教版教材”];人民教育出版社义务教育课程标准实验教科书《化学》(上、下册)[下称“人教版实验教材”];上海教育出版社义务教育课程标准实验教科书《化学》(上、下册)[下称“上教版实验教材”]。在教学教研的工作实践中笔者依据中华人民共和国教育部制订的《全日制义务教育化学课程标准(实验稿)》[下称“化学课标”]的精神对这3种版本教材的主要栏目设置及内容作了如下的统计分析: 相似文献
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人教版新课标化学教科书中"科学探究"的编制解析与实施建议 总被引:8,自引:0,他引:8
《义务教育课程标准实验教科书·化学 (九年级 )》(人教版 )继在全国基础教育课程改革实验区进行教育实验之后 ,已陆续在全国很多地区推广试用。科学探究是新化学课程标准提倡的重要理念之一 ,因此 ,使用新教科书的许多教师对教科书中如何落实“科学探究”给予了高度的关注。本文结合参加教学实验的教师的反馈信息 ,对教科书中有关科学探究的编写思路、内容与形式进行简要解析 ,并对教学实践中实施科学探究提几点不成熟的建议。1 教科书中“科学探究”的编写思路为了落实科学探究理念 ,教科书的编著者在编制过程中遵循了如下的思路。1.1 … 相似文献
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师范学校化学教学的重要任务之一,就是要使学生对小学自然课程的教学作好准备。通过教学实践,我有下列的几点体会: (一)要钻研师范学校化学教学大纲(草案)、教科书、小学自然教学大纲和小学自然教科书:找出它们之间的内在连系:大纲和教科书里在那些地方体现了这个重要的任务呢?我认为是:师范化学教学大纲(草案)规定的,教科书里叙述的与小学自然教学有关的化学基础知识:如小学自然课本第一册第一部分“水”第三课是“溶解和不溶解”,而在师范学校化学课本中 相似文献
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现行各种版本的《义务教育课程标准实验教科书:化学》中均安排了内容相似的空气课题,本课时内容就选自空气的第一部分——测量空气中氧气的体积分数。1设计思路《全日制义务教育化学课程标准(实验稿)》明确要求学生实验探究空气中氧气的体积分数,因此在进行空气的教学时,将第一部分测量空气中氧 相似文献
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在新编全日制普通中学化学教科书(实验修订本*必修)(第一册)中增加了15个小实验,其中6个家庭小实验,9个选做实验(以下均称为小实验).这是实施素质教育和进行开放性教学,培养学生动手能力和创新意识的重要举措之一.所以,对于如何领会、落实这些"小实验"的教学将是课改的关键所在. 相似文献
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实验安全是化学实验教学过程中的重要组成部分,也是每一个设置化学实验课程的各层次学校重点工作之一。北京化工大学化学实验教学中心经过多年教学探索,逐渐形成了“实验技术讲座”“实验安全与环保大课堂”“实验项目实施过程中的安全讲解及演示”“实验室突发事故紧急疏散演练”“实验室消防演练”五位一体的化学实验安全防范教学机制,极大地提升了学生实验过程中的安全防范意识,确保了实验安全平稳进行,有效地保证了良好的校园教学秩序。本论文将对上述“五位一体”化学实验安全教育教学模式进行剖析,希望与同行共同探究如何保证化学实验课程教学的安全开展。 相似文献
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在新编全日制普通中学化学教科书(实验修订本·必修)(第一册)中增加了15 个小实验, 其中6 个家庭小实验, 9 个选做实验(以下均称为小实验)。这是实施素质教育和进行开放性教学, 培养学生动手能力和创新意识的重要举措之一。所以, 对于如何领会、落实这些“小实验”的教学将是课改的关键所在。 相似文献
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The syntheses of 3β-hydroxy-5β-carda-14, 20:22-dienolide (= «β»-anhydro-), 3β-hydroxy-5β-carda-8:14, 20:22-dienolide (= «α»-anhydro-) and «δ»-anhydro-digitoxigenin (= probably 3β-hydroxy-5β, 14β-carda-8, 20:22-dienolide) by the best ways known to date, have been described. «δ»-Anhydro-digitoxigenin represents the thermodynamically most stable isomer. In this isomer the double bond in position 8 is unaffected by hydrogenation with Pt in acetic acid; with perbenzoic acid an epoxide results from which, on hydrogenation, the double bond can be regenerated in its original position. Analogous reactions are known to occur in the 8:14-epoxides. 相似文献
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Chemistry is a central, practical and creative discipline. The development of chemistry plays an important role in the progress of science and society, as well as the improvement of the quality of human life. This paper introduces the chemical knowledge of stone, concrete, glass and other inorganic nonmetallic building materials by the anthropomorphically story. Taking nanomaterials as an example, the prospect of building materials development in the future is put forward. 相似文献
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Scott RT Milios CJ Vinslava A Lifford D Parsons S Wernsdorfer W Christou G Brechin EK 《Dalton transactions (Cambridge, England : 2003)》2006,(26):3161-3163
[Mn(IV)Mn(II)3] triangular units directed by the presence of tripodal alcohols self-assemble in the presence of azide and acetate ligands to form either a [Mn24] "wheel" or a [Mn32] "cube". 相似文献
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Chemical probes are valuable tools for the investigation of biochemical processes, diagnosis of disease markers, detection of hazardous compounds, and other purposes. Therefore, the development of chemical probes continues to grow through various approaches with different disciplines and design strategies. Fluorescent probes have received much attention because they are sensitive and easy-to-operate, in general. To realize desired selectivity toward a given analyte, the recognition site of a fluorescent probe is designed in such a way to maximize the binding interactions, usually through weak molecular forces such as hydrogen bonding, toward the analyte over other competing ones. In addition to such a supramolecular approach, the development of fluorescent probes that sense analytes through chemical reactions has witnessed its usefulness for achieving high selectivity, in many cases, superior to that obtainable by the supramolecular approach. Creative incorporations of the reactive groups to latent fluorophores have provided novel chemical probes for various analytes. In this feature article, we overview the recent progress in the development of turn-on fluorescent probes that are operating through chemical reactions triggered by target analytes. Various chemical reactions have been implemented in the development of many reactive probes with very high selectivity and sensitivity toward target analytes. A major emphasis has been focused on the type of chemical reactions utilized, with the hope that further explorations can be made with new chemical reactions to develop reactive probes useful for various applications. 相似文献
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Opsteen JA Brinkhuis RP Teeuwen RL Löwik DW van Hest JC 《Chemical communications (Cambridge, England)》2007,(30):3136-3138
Polymersomes, composed of amphiphilic polystyrene-block-poly(acrylic acid) (PS-b-PAA), with the periphery being covered with azide groups, were used for further functionalization using "click" chemistry. 相似文献
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