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利用化学教学设计评价量表(CTDES),对广州市某高校86名化学师范生在教育实习期间完成的教学设计进行评价,发现师范生在“认知与元认知”“社会文化与情感”“科学描述与应用”指标表现中等,在“一致性”指标表现较好。师范生在对“理论化学”和“描述化学”类课题进行教学设计时,在“认知与元认知”“社会文化与情感”“科学描述与应用”3个指标上的得分存在显著差异。 相似文献
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化学核心素养包含了“化学”的素养、“核心”的素养、“人”的素养三重意蕴。基于对化学核心素养的概念分析和层次分析,提出其四维度结构模型。在4个维度中,“化学基本观念”是基础维度,“化学过程”和“化学在生活中的应用”是2个活化维度,“对化学的态度”是动力维度。化学核心素养为学术性化学素养和生活性化学素养的发展同时奠定了基础。把握3种化学素养在结构和具体维度上的差异有助于理解化学核心素养的内涵,也有助于把握中学化学课程中不同模块的教学定位。 相似文献
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依托“化学教学论实验”课程教学,在探究性学习理念指导下,通过师范生对主题实验在扎实、全面的文献梳理基础上,重点从仪器、药品及实验方案等维度进行创新性改进和设计活动,达成创新能力培养的教学目标。实践证明,发挥实验在化学学科教学中的重要价值,凸显教师主导和学生主体的教学模式,不仅有利于提升师范生对学习和教学的内涵理解,更有利于在真实参与的学习活动中培养和提高创新思维及能力。 相似文献
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结合本校化学教学论实验的教学现状,融合云教学及翻转课堂理念对教学进行重构,设计并实施以“蓝墨云班课”云平台为师生互动桥梁的翻转课堂云教学。以中学化学数字化实验教学为例,让化学师范生以“学习者”和“未来教师”的双重角色体验翻转课堂云教学的学习过程,并利用SERVQUAL模型评价法对云教学进行数据分析、反馈完善。通过进一步问卷分析,了解到学生不仅熟练地掌握了所学知识内容,而且对翻转课堂模式与实施细节有了更为深刻的理解,最后对翻转课堂云教学及师范生教学提出了几点建议。 相似文献
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利用“理科师范生使用课程材料情况问卷”,对广州市某高校167名理科师范生在教育实习期间使用课程材料的形态进行调查,发现理科师范生在各维度均表现出较好的课程材料使用形态,但未达到很高的水平。不同专业师范生的课程材料使用形态在“科学探究”“STSE”和“教师学习”维度存在显著差异;不同实习学校类型师范生的课程材料使用形态在“STSE”维度存在显著差异;不同实习年级师范生的课程材料使用形态不存在显著差异;有无家教经验师范生的课程材料使用形态在“科学探究”“STSE”和“教师学习”维度存在显著差异。文章最后提出理科师范教育的建议。 相似文献
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“模型认知”是化学核心素养的重要组成部分,本研究确立了化学模型认知能力的构成要素及其相关的表现指标,并设计调查问卷探查化学师范生“模型认知”能力现状。调查结果显示:化学师范生“模型认知”能力整体水平不高,随年级升高,无性别差异。 相似文献
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采用“中学化学课堂环境问卷”作为研究工具,对深圳市、长春市、佳木斯市等3个地区的4所高中861名学生的化学课堂环境进行调查,并进行差异分析。研究结果表明,高中生对化学课堂环境的总体感知较好,7个维度中“学生凝聚力”“平等”“任务取向”“合作”等4个维度的平均分大于3.4,“教师支持”和“参与”维度的平均分在3.0~3.4,只有“探究”维度的平均分小于3.0。城市高中生对课堂环境的感知明显好于乡镇高中生,学生心目中所期待的化学课堂比实际的化学课堂更积极。 相似文献
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Kerstin Schulze‐Matthi Jürgen Bendig Petra Neubauer Burkhard Ziemer 《Acta Crystallographica. Section C, Structural Chemistry》2000,56(6):e257-e258
The bonding geometry of sulfur in the cations of the title compounds, C8H11S+·CF3SO3? and C13H13S+·CF3SO3?, respectively, is similar and is independent of the ratio of the Me/Ph substituents. As expected, in both cations, the S—Ph bonds are somewhat shorter than the S—Me bonds. In both crystal structures, the interaction between cations and anions is similar. 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
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A. V. Egorysheva V. D. Volodin T. Milenov P. Rafailov V. M. Skorikov T. D. Dudkina 《Russian Journal of Inorganic Chemistry》2010,55(11):1810-1817
A physicochemical study of glasses based on the MO-Bi2O3-B2O3 and SrO-Bi2O3-B2O3 systems was performed. Glass formation regions were found. The structural and optical properties, as well as the thermal
behavior of the glasses, were studied. 相似文献
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Jem‐Mau Lo Golam Mostafa Ling‐Yin Chang Fen‐Ling Liao Tian‐Huey Lu 《Acta Crystallographica. Section C, Structural Chemistry》2004,60(4):o276-o277
The title compound, C10H18N2S2, acts as an important precursor for the synthesis of the pharmaceutically important diaminedithiol ligand system. The molecule has a local twofold axis and the arrangement of the S2N2 donor atoms in the macrocycle is anticlinal. 相似文献
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S. Shanmuga Sundara Raj Hoong‐Kun Fun Zhong‐Lin Lu Wen Xiao Xiao‐Yang Gong Chang‐Ming Gen 《Acta Crystallographica. Section C, Structural Chemistry》2000,56(8):1015-1016
The whole molecule of the title compound, C19H14N4O2, is essentially planar, with a highly conjugated π system. In the crystal, the molecules are packed as chains along the [011] direction connected by O—H?N intermolecular hydrogen bonds. 相似文献
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John Nicolson Low George Ferguson James L. Wardell 《Acta Crystallographica. Section C, Structural Chemistry》2000,56(8):e317-e317
In the title compound, [Sb(CH3)(C6H5)3]BF4, there are four independent cations and anions in the asymmetric unit. The geometry around the Sb atom is distorted tetrahedral, with Sb—C distances in the range 2.077 (4)–2.099 (10) Å and angles at the Sb atom in the range 103.3 (3)–119.0 (4)°. 相似文献
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Maren Pink Doyle Britton Wayland E. Noland Matthew J. Pinnow 《Acta Crystallographica. Section C, Structural Chemistry》2000,56(10):1271-1273
The molecular structures of the title compounds, 2,4,6‐trichlorophenylisonitrile (IUPAC name: 2,4,6‐trichlorophenyl isocyanide), C7H2Cl3N, and 2,4,6‐trichlorobenzonitrile, C7H2Cl3N, are normal. The two structures are not isomorphous, but do contain similar two‐dimensional layers in which pairs of molecules are held together by pairs of Cl?CN [3.245 (3) Å] or Cl?NC [3.153 (2) Å] interactions. The two‐dimensional isomorphism is lost through different layer‐stacking modes. 相似文献
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Hai-Rong Guo Yuan Gao Ai-Dong Li Zhong Yan Di Wu 《Journal of Sol-Gel Science and Technology》2008,45(3):315-318
Pb0.56Sr0.44Zr0.52Ti0.48O3 (PSZT) inverse opal photonic crystals (PCs) have been synthesized by a process of self-assembly in combination with a sol–gel
procedure. PSZT inverse opals show pure perovskite structure with good orders in three dimensions. The evident photonic band
gaps have been observed in the transmittance spectra with a blue-shift phenomenon due to the decrease of opal template periods.
PSZT inverse opals also exhibit the reflection peaks in basic agreement with the calculated results. This three-dimensional
(3D) ordered PSZT inverse opals have shown interesting optical characteristics and potential applications in optoelectronic
and photonic devices. 相似文献
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Gang Xue Qi Fang Wentao Yu 《Acta Crystallographica. Section C, Structural Chemistry》2003,59(11):o653-o655
4,5‐Propylenedithio‐1,3‐dithiole‐2‐thione, C6H6S5, (I), crystallizes in the centrosymmetric space group P21/c. The molecular packing is characterized by pairs of S⋯S intermolecular contacts between neighbouring molecules, which may account for the rather high thermal stablity of the crystal. 4,5‐Propylenedithio‐1,3‐dithiol‐2‐one, C6H6OS4, (II), in which an O atom replaces the terminal S atom of (I), crystallizes in the non‐centrosymmetric polar space group Cc. The packing pattern of (II) indicates that the macropolarization direction is along [101]. Although the packing patterns are qualitatively significantly different, the molecular structures of (I) and (II) are similar, each exhibiting a chair conformation. 相似文献