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有机融合学生生活中的经验与体验和化学学习中的认知与思维,可优化课堂进程,提高学习效率,让化学知识建构的过程同时成为化学学科核心素养发展提升的过程。在“铁及其化合物的应用”的教学中,以“笔·墨”为情境生成真实问题,在互动、探究、体验中整合物质性质,建构思维模型,并应用模型解决问题,发展科学探究、证据推理、模型认知等化学学科核心素养。 相似文献
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核心素养的培养是现代教育思想和实践的重要变革,是新课程改革背景下中国教育由应试向素质转变的重要理念,对于课堂教学活动有着深刻的影响。在化学教学改革过程中,教师的教学观念无疑起着非常重要的作用,是化学核心素养理念得以在课堂教学实践中予以充分体现的保障,也是促进学生综合素能提升的根本。 相似文献
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在“食盐精制:从微观角度看粗盐中可溶性杂质的去除”的单元教学中,通过初识粗盐中的杂质、微观角度看氯化钠、微观角度看粗盐溶液、微观角度认识除杂方法、设计除杂方案并实施等活动,促进学生理解与应用电离、离子反应等核心概念,引领学生解决真实问题,形成解决除杂实验问题的基本思路,实现能力素养的发展。经过多轮次教学改进,结合教学实践及其教学效果抽提出“聚焦核心概念和学生必做实验,实现认识能力的进阶与实际问题解决过程高度融合”“通过学科实践及实验探究,建立宏观、微观、符号关联,突出证据推理,构建思维模型”“通过持续性评价活动,外显学生的前概念,促进概念转变,形成化学学科思维方式”等教学策略。 相似文献
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以“环氧乙烷制备工艺中的绿色化学”为项目式学习主题,以绿色化学概念学习、化学工艺中绿色化学的设计评价等为项目学习活动,探究绿色化学理念的教学设计。培养学生绿色化学意识,提升科学态度和社会责任的化学学科核心素养。 相似文献
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分析了《义务教育化学课程标准(2022年版)》学习主题5“化学与社会·跨学科实践”的核心素养发展定位,阐述了该学习主题的内容要求及主要变化,说明了素养导向学业要求的制订思路、具体要求及应用建议,在阐述教学提示的基础上,提出了该学习主题的教学建议,促进教师转变观念,积极实施和探索学习主题5的教学,促进学生核心素养的融合发展。 相似文献
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Areas of fusion and crystallization peaks of K3TaO2F4 and KTaF6 were measured using the DSC mode of a high-temperature calorimeter (SETARAM 1800 K). On the basis of these quantities, considering
the temperature dependence of the calorimeter sensitivity, values of the fusion enthalpy of K3TaO2F4 at the fusion temperature of 1181 K of (43 ± 4) kJ mol−1 and of KTaF6 at the fusion temperature of 760 K of (8 ± 1) kJ mol−1 were determined. 相似文献
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V. M. Novotortsev S. F. Marenkin I. V. Fedorchenko A. V. Kochura 《Russian Journal of Inorganic Chemistry》2010,55(11):1762-1773
The results of studying phase equilibria of ternary AIIBIVCV systems have been reported. Physicochemical foundations have been developed for the synthesis of new ferromagnets with Curie
temperatures above room temperature structurally compatible with basic semiconducting materials. Methods of synthesis and
physicochemical properties of manganese-doped AIIBIVC2V ferromagnets have been described. The results of theoretical simulation of magnetic properties have been considered and basic
approaches to the explanation of the emergence of ferromagnetism in AIIBIVC2V doped with 3d metals have been surveyed. The most promising ways to produce and study dilute magnetic semiconductors as spintronics materials
have been presented. 相似文献
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Areas of fusion and crystallization peaks of K3NbO2F4 were measured using the DCS mode of a high-temperature calorimeter (SETARAM 1800 K). On the basis of these quantities, considering
the temperature dependence of the calorimeter sensitivity, the value of the fusion enthalpy of K3NbO2F4 of (98 ± 6) kJ mol−1 was determined at the fusion temperature of 1257 K. 相似文献
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I. E. Zanin K. B. Aleinikova M. M. Afanasiev M. Yu. Antipin 《Journal of Structural Chemistry》2004,45(5):844-848
The structure of Zn3P2 (P 42/nmc, a = b = 8. 0785 Å, c = 11. 3966 Å) was solved and refined to R = 3. 2% in a precision X-ray diffraction experiment (λ-MoK
a, graphite monochromator on a primary beam, 27,496 reflections) . Interatomic distances and bond angles have been determined. The fcc lattice of the structure is built from phosphorus atoms, and the zinc atoms occupy 3/4 of all tetrahedral voids; the structure is described by two equivalent models where 1/4 occupied (by zinc atoms) and 1/4 vacant voids change places. The zinc atoms that occupy the voids following the diamond principle do not change places.Original Russian Text Copyright © 2004 by I. E. Zanin, K. B. Aleinikova, M. M. Afanasiev, and M. Yu. Antipin__________Translated from Zhurnal Strukturnoi Khimii, Vol. 45, No. 5, pp. 889–892, September–October, 2004. 相似文献
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Aleksandra Yu. Tarasova Yu. V. Seryotkin V. M. Pashkov Ludmila I. Isaenko 《Journal of Thermal Analysis and Calorimetry》2011,104(2):795-796
The temperature dependence of unit cell parameters for monoclinic KPb2Cl5 and tetragonal RbPb2Br5 crystals was studied in the range of 100–298 K. Linear and volume thermal expansion coefficients were determined. 相似文献
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L. E. Derlyukova M. V. Vinokurova T. A. Anufrieva 《Russian Journal of Inorganic Chemistry》2008,53(9):1371-1375
The reaction of Bi2O3 + Fe2O3 mixtures with chlorine and SO2 at 250–700°C is studied. At 300–500°C, the degree of bismuth chloride sublimation from the oxide mixture increases in the presence of SO2. Chemical sublimation of FeCl3 occurs after BiCl3 is virtually completely recovered from the solid phase. 相似文献
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科学史奠基者乔治·萨顿在《科学史导论》第二卷的第一部分对我国宋代酿酒著作《北山酒经》予以了简要描述,出现了“spirits”“distillation”等字样;而《北山酒经》被众多学者认为其描述对象是发酵酒(黄酒)。本文从东西方蒸馏技术和相关著作的文本分析对《科学史导论》中提及的蒸馏技术和蒸馏酒存在的可能性提出了质疑。 相似文献
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Russell G. Baughman Kenneth L. Martin Rajendra K. Singh James O. Stoffer 《Acta Crystallographica. Section C, Structural Chemistry》2004,60(2):o103-o106
In 2,4‐dihydroxybenzaldehyde 2,4‐dinitrophenylhydrazone N,N‐dimethylformamide solvate {or 4‐[(2,4‐dinitrophenyl)hydrazonomethyl]benzene‐1,3‐diol N,N‐dimethylformamide solvate}, C13H10N4O6·C3H7NO, (X), 2,4‐dihydroxyacetophenone 2,4‐dinitrophenylhydrazone N,N‐dimethylformamide solvate (or 4‐{1‐[(2,4‐dinitrophenyl)hydrazono]ethyl}benzene‐1,3‐diol N,N‐dimethylformamide solvate), C14H12N4O6·C3H7NO, (XI), and 2,4‐dihydroxybenzophenone 2,4‐dinitrophenylhydrazone N,N‐dimethylacetamide solvate (or 4‐{[(2,4‐dinitrophenyl)hydrazono]phenylmethyl}benzene‐1,3‐diol N,N‐dimethylacetamide solvate), C19H14N4O6·C4H9NO, (XII), the molecules all lack a center of symmetry, crystallize in centrosymmetric space groups and have been observed to exhibit non‐linear optical activity. In each case, the hydrazone skeleton is fairly planar, facilitated by the presence of two intramolecular hydrogen bonds and some partial N—N double‐bond character. Each molecule is hydrogen bonded to one solvent molecule. 相似文献