浅谈中学化学概念教学策略
作者:
王敏;陈亚妹
期刊:
科教文汇(下旬刊) ,2007年(06):104 ISSN:1672-7894
作者机构:
华中师范大学化学学院,湖北·武汉,430079;[陈亚妹; 王敏] 华中师范大学
关键词:
化学概念;教学;策略
摘要:
化学概念是化学现象和化学事实本质属性的反映,是化学知识的重要组成部分,是学好其他化学知识的基础。怎样通过合理的组织课堂教学过程,保证教学的最大效果。本文结合化学概念的基本特征,谈谈化学概念教学优化的策略问题。
语种:
中文
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甲阶酚醛树脂酯催化反应动力学及产物热分析
作者:
徐闫;谭晓明;张济超;石红娥
期刊:
粘接 ,2007年28(1):8-10 ISSN:1001-5922
作者机构:
华中师范大学化学学院,湖北,武汉,430079;孝感学院化学系,湖北,孝感,432100;[张济超; 谭晓明] 孝感学院;[石红娥; 徐闫] 华中师范大学
关键词:
甲阶酚醛树脂;交联反应;酯催化;动力学;热分析
摘要:
利用凝胶转化率的测定,研究了醋酸甘油酯(三醋酸甘油酯、二醋酸甘油酯、一醋酸甘油酯)对甲阶酚醛树脂交联反应的催化动力学,并对交联产物进行了热分析.结果表明,醋酸甘油酯对甲阶酚醛树脂的催化交联反应是一级动力学反应,三醋酸甘油酯、二醋酸甘油酯、一醋酸甘油酯等作催化剂时该反应的表观活化能分别为:11.45 kJ/mol、22.53 kJ/mol和29.27 kJ/mol;交联反应主要由甲阶酚醛树脂中的羟甲基引起,其酯催化交联产物比热固化产物更容易发生热分解.
语种:
中文
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[4-([(Z)-(2,5-Dimethylphenylamino)phenylmethylene]-3-methyl-1-phenyl-1H- pyrazol-5(4H)-one
作者:
Ma, Rui;Ma, Rongming;Hou, Yubang;Yong, Xuejian;Bao, Feng*
期刊:
ACTA CRYSTALLOGRAPHICA SECTION C-STRUCTURAL CHEMISTRY ,2007年63(11):O4416-U4332 ISSN:2053-2296
通讯作者:
Bao, Feng
作者机构:
[Bao, Feng] China Univ Geosci, Dept Mat Sci & Chem Engn, Wuhan 430074, Peoples R China.;Xianning Coll, Dept Chem & Life Sci, Xianning 437005, Peoples R China.;Cent China Normal Univ, Dept Chem, Wuhan 430079, Peoples R China.
通讯机构:
[Bao, Feng] C;China Univ Geosci, Dept Mat Sci & Chem Engn, Wuhan 430074, Peoples R China.
摘要:
There are two mol-ecules in the asymmetric unit of the title compound, C25H23N3O, both of which are stabilized by an intra-molecular N - H⋯O hydrogen bond. The dihedral angles between the pyrazole plane and the attached phenyl ring in the two molecules are 19.9 (2) and 17.7 (2)°. © International Union of Crystallography 2007.
语种:
英文
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Dimethyl [(5-ethoxycarbonyl-4-methyl-1,3-thiazol-2-ylamino)phenylmethyl]- phosphonate
作者:
Xu, Di-Fan;Liu, Xiao-Kou;He, Hong-Wu*
期刊:
ACTA CRYSTALLOGRAPHICA SECTION C-STRUCTURAL CHEMISTRY ,2007年63(11):O4392-U4103 ISSN:2053-2296
通讯作者:
He, Hong-Wu
作者机构:
[He, Hong-Wu; Liu, Xiao-Kou; Xu, Di-Fan] Cent China Normal Univ, Coll Chem, Minist Educ, Key Lab Pesticides & Chem Biol, Wuhan 430079, Peoples R China.
通讯机构:
[He, Hong-Wu] C;Cent China Normal Univ, Coll Chem, Minist Educ, Key Lab Pesticides & Chem Biol, Wuhan 430079, Peoples R China.
摘要:
In the structure of the title compound, C16H21N2O5PS, the P atom adopts a slightly distorted tetra-hedral configuration. The crystal packing is stabilized by intra-molecular C - H⋯N and C - H⋯O and inter-molecular N - H⋯O hydrogen-bonding inter-actions. © International Union of Crystallography 2007.
语种:
英文
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电脑游戏——青少年青春的刽子手
作者:
何香兰;李静
期刊:
科教文汇(下旬刊) ,2007年(10):225 ISSN:1672-7894
作者机构:
华中师范大学化学学院,湖北·武汉,430079
关键词:
电脑游戏;青春;游戏的魅力;心理问题
摘要:
"网络成癌"这一名词已经成为越来越多人关注的焦点.事实告诉我们:电脑游戏就像鸦片一样,使青少年在无形中对它形成依赖,它在吞噬着人们短暂而宝贵的青春.
语种:
中文
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Rac-12a,11b-Diphenyl-1,2,3,4,5,11-hexa-hydro-2,3,4a,5a,10a, 11a-hexa-azabenz[f]indeno[2,1,8-ija]naphth[2,3-f]azulene-1,4,10-trione chloro-form solvate
作者:
Sheng-Li Hu* ;Jian-Min Zhang;Gang Yan;Shuai Wang
期刊:
ACTA CRYSTALLOGRAPHICA SECTION C-STRUCTURAL CHEMISTRY ,2007年63(9):O3909-U3944 ISSN:2053-2296
通讯作者:
Sheng-Li Hu
作者机构:
[Sheng-Li Hu] Cent China Normal Univ, Coll Chem, Minist Educ, Key Lab Pesticides & Chem Biol, Wuhan 430079, Peoples R China.;Hubei Normal Univ, Hubei Key Lab Bioanalyt Tech, Huangshi 435002, Peoples R China.
通讯机构:
[Sheng-Li Hu] C;Cent China Normal Univ, Coll Chem, Minist Educ, Key Lab Pesticides & Chem Biol, Wuhan 430079, Peoples R China.
摘要:
The title compound, C25H20N6O3·CHCl3, a rigid glycoluril derivative, is an inter-mediate for the synthesis of mol-ecular tweezers. The crystal structure is stabilized by inter-molecular C - H⋯O and N - H⋯O hydrogen bonds. The chloro-form solvent mol-ecule is disordered over two positions; the site occupancy factors are ca 0.89 and 0.11. © International Union of Crystallography 2007.
语种:
英文
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对Na2S溶液和FeCl3溶液的反应的探讨
作者:
许瑞君;叶婧聪
期刊:
河北理科教学研究 ,2007年(3):51-52 ISSN:1005-9741
作者机构:
湖北省华中师范大学化学学院,430079;[许瑞君; 叶婧聪] 华中师范大学
关键词:
溶液;反应;实验现象
摘要:
<正>1总述Na2S溶液和FeCl3溶液的反应是一个比较复杂的反应,将Na2S溶液滴加到FeCl3溶液中和将FeCl3溶液滴加到Na2S溶液中所观察到的实验现象是不同的.本文在实验的基础上,对实验现象进行了分析和解释,希望能对这一反应有进一步的认识.
语种:
中文
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Crystal structure of 1-(3-methylbenzoyl)-3-(5-(E)-styryl-1,3,4-thiadiazol- 2-yl)urea, C19H16N4O2S
作者:
Song, Xin-Han* ;Tan, Xiao-Hong;Wang, Fa-Song;Wang, Yan-Gang
期刊:
ZEITSCHRIFT FUR KRISTALLOGRAPHIE-NEW CRYSTAL STRUCTURES ,2007年222(4):418-420 ISSN:1433-7266
通讯作者:
Song, Xin-Han
作者机构:
[Song, Xin-Han; Wang, Fa-Song] Hubei Inst Nationalities, Key Lab Biol Resources Protect & Utilizat Hubei, Enshi 445000, Hubei, Peoples R China.;[Tan, Xiao-Hong] Hubei Inst Nationalities, Sch Chem & Environm Engn, Enshi 445000, Hubei, Peoples R China.;[Wang, Yan-Gang] Cent China Normal Univ, Coll Chem, Wuhan 430079, Peoples R China.
通讯机构:
[Song, Xin-Han] H;Hubei Inst Nationalities, Key Lab Biol Resources Protect & Utilizat Hubei, Enshi 445000, Hubei, Peoples R China.
摘要:
Article Crystal structure of 1-(3-methylbenzoyl)-3-(5-(E)-styryl-1,3,4-thiadiazol- 2-yl)urea, C19H16N4O2S was published on December 1, 2007 in the journal Zeitschrift für Kristallographie - New Crystal Structures (volume 222, issue 4).
语种:
英文
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浅谈我国大学生素质之不足及其对策
作者:
杨海霞;李瑞芝
期刊:
科教文汇(下旬刊) ,2007年(20):17-18 ISSN:1672-7894
作者机构:
华中师范大学化学学院;华中师范大学化学学院 湖北.武汉430079;[杨海霞; 李瑞芝] 华中师范大学
关键词:
大学生素质;信息意识;创新实践能力;合作能力
摘要:
当今我国大学的培养模式与培养理念在不断地改进,但还是有些不足之处,有些大学还没有意识到培养大学生的能力是大学教育的核心.与外国大学生相比较,我国的大学生在信息意识能力、创新实践能力以及与人合作的能力还有些差距.我国大学应借鉴外国大学培养学生的成功之处,结合自己学校的实际情况通过学校和学生的共同努力,使学生的素质得到进一步的提高.
语种:
中文
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2-{(2-Chlorophenyl)[(2,4-dichlorophenoxy)-acetoxy]methyl}-5,5-dimethyl-1,3, 2-dioxa-phosphinan-2-one
作者:
Zuo, Na;He, Hong-Wu*
期刊:
ACTA CRYSTALLOGRAPHICA SECTION C-STRUCTURAL CHEMISTRY ,2007年63(2):o794-o795 ISSN:2053-2296
通讯作者:
He, Hong-Wu
作者机构:
[He, Hong-Wu; Zuo, Na] Cent China Normal Univ, Key Lab Pesticides & Chem Biol, Wuhan 430079, Peoples R China.
通讯机构:
[He, Hong-Wu] C;Cent China Normal Univ, Key Lab Pesticides & Chem Biol, Wuhan 430079, Peoples R China.
摘要:
In the title compound, C20H20Cl3O 6P, all bond lengths and angles are normal. The P atom is in a distorted tetrahedral configuration. The crystal packing is stabilized by weak intermolecular C-H⋯O hydrogen bonds and π-π interactions. © 2007 International Union of Crystallography All rights reserved.
语种:
英文
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4-Oxo-3,4-dihydroquinazolin-3-ylmethyl N,N-diisopropylcarbamodithio-ate
作者:
Liu, Ming-Zhen;Huang, Wei*
期刊:
ACTA CRYSTALLOGRAPHICA SECTION C-STRUCTURAL CHEMISTRY ,2007年63(11):O4299-U3196 ISSN:2053-2296
通讯作者:
Huang, Wei
作者机构:
[Liu, Ming-Zhen; Huang, Wei] Cent China Normal Univ, Coll Med, Key Lab Pest & Chem Biol Minist Educ, Wuhan 430079, Peoples R China.
通讯机构:
[Huang, Wei] C;Cent China Normal Univ, Coll Med, Key Lab Pest & Chem Biol Minist Educ, Wuhan 430079, Peoples R China.
摘要:
In the title compound, C16H21N3OS2, the dihedral angle between the aromatic rings is 3.60 (3)°. An inter-molecular C - H⋯O hydrogen bond links the mol-ecules into chains along the c axis. © International Union of Crystallography 2007.
语种:
英文
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水杨醛亚胺的微波驱动无溶剂合成
作者:
王跃丹;杨海健
期刊:
中南民族大学学报(自然科学版) ,2007年26(4):1-4 ISSN:1672-4321
作者机构:
华中师范大学化学学院,农药学与化学生物学教育部重点实验室,武汉,430079;中南民族大学,化学与材料科学学院催化材料科学湖北省暨国家民委-教育部共建重点实验室,武汉,430074;[王跃丹] 华中师范大学;[杨海健] 中南民族大学
关键词:
微波无溶剂合成;无催化剂;水杨醛亚胺;快速高效
摘要:
为寻求简单快速合成金属催化剂配体化合物西佛碱的方法,利用微波驱动的有机反应具有快速高效的优点,于无溶剂、616W微波功率驱动下,20s~4 min快速高效合成了6种水杨醛亚胺类化合物.化合物的化学结构经IR,NMR和元素分析测试加以证实.
语种:
中文
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A self-assembled pentanuclear single-stranded helicate based on the square-planar coordination geometries
作者:
Liu, Huan;Zhou, Hong;Pan, Zhi-Quan* ;Hu, Dan;Huang, Qi-Mao;...
期刊:
Inorganic Chemistry Communications ,2007年10(7):805-807 ISSN:1387-7003
通讯作者:
Pan, Zhi-Quan
作者机构:
[Pan, Zhi-Quan] Wuhan Inst Technol, Hubei Key Lab Novel Chem Reactor & GCT, Wuhan 430073, Peoples R China.;Cent China Normal Univ, Dept Chem, Wuhan 430079, Peoples R China.
通讯机构:
[Pan, Zhi-Quan] W;Wuhan Inst Technol, Hubei Key Lab Novel Chem Reactor & GCT, Wuhan 430073, Peoples R China.
关键词:
Copper(II) pentanuclear complex;N4O ligands;Self-assembly;Single helicate
摘要:
The copper(II) complex of a new bis-N4O-hexdentate Schiff-base, in which two N,N′-dimethyl-N-(3-(2′-aminoethylimine)-5-(chlorosalicylamine))-N′-(3-imine-5-chlorosalicylamine) units are connected by an ethylene, was synthesized and structurally characterized in the solid state as a form of pentanuclear single helicate based on the square-planar coordination geometries. © 2007 Elsevier B.V. All rights reserved.
语种:
英文
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N-[(2,4-Dichloro-phen-oxy)acet-yl]-N′-(dimethoxy-thio-phosphino-yl ) hydrazine
作者:
Zhang, Hui-Rong;Peng, Hao;He, Hong-Wu*
期刊:
ACTA CRYSTALLOGRAPHICA SECTION C-STRUCTURAL CHEMISTRY ,2007年63(3):o1080-o1081 ISSN:2053-2296
通讯作者:
He, Hong-Wu
作者机构:
[Zhang, Hui-Rong; He, Hong-Wu; Peng, Hao] Cent China Normal Univ, Key Lab Pesticides & Chem Biol, Minist Educ, Wuhan 430079, Peoples R China.
通讯机构:
[He, Hong-Wu] C;Cent China Normal Univ, Key Lab Pesticides & Chem Biol, Minist Educ, Wuhan 430079, Peoples R China.
摘要:
In the title compound, C10H13Cl2O4PS, all bond lengths and angles are normal. The P atom is in a distorted tetra-hedral configuration. In the crystal structure, inter-molecular N - H⋯O hydrogen bonds link the mol-ecules into chains running along the b axis. © 2007 International Union of Crystallography.
语种:
英文
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Selective synthesis and visible-light photocatalytic activities of BiVO4 with different crystalline phases
作者:
Zhang, Xi;Ai, Zhihui* ;Jia, Falong;Zhang, Lizhi;Fan, Xiaoxing;...
期刊:
Materials Chemistry and Physics ,2007年103(1):162-167 ISSN:0254-0584
通讯作者:
Ai, Zhihui
作者机构:
[Ai, Zhihui] Cent China Normal Univ, Coll Chem, Minist Educ, Key Lab Pesticide & Chem Biol, Wuhan 430079, Peoples R China.;Nanjing Univ, Dept Phys, ERERC, Nanjing 210093, Peoples R China.
通讯机构:
[Ai, Zhihui] C;Cent China Normal Univ, Coll Chem, Minist Educ, Key Lab Pesticide & Chem Biol, Wuhan 430079, Peoples R China.
关键词:
bismuth vanadate;selective synthesis;photocatalyst;visible-light
摘要:
Tetragonal and monoclinic bismuth vanadate (BiVO<inf>4</inf>) powders were selectively synthesized by aqueous processes. The characterizations of the as-prepared BiVO<inf>4</inf> powders were carried out by X-ray diffraction, nitrogen adsorption, scanning electron microscopy and UV-vis diffuse reflectance spectroscopy. The photocatalytic activities of different BiVO<inf>4</inf> samples were determined by degradation of methylene blue solution under visible-light irradiation (λ>420 nm) and compared with that of TiO<inf>2</inf> (Degussa P25). The band gaps of the as-prepared BiVO<inf>4</inf> were determined from UV-vis diffuse reflectance spectra. It was found that monoclinic BiVO<inf>4</inf> with a band gap of 2.34 eV showed higher photocatalytic activity than that of tetragonal BiVO<inf>4</inf> with a band gap of 3.11 eV. ©2007 Elsevier B.V. All rights reserved.
语种:
英文
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A general soft interface platform for the growth and assembly of hierarchical rutile TiO2 nanorods spheres
作者:
Xu, Hua;Jia, Falong* ;Ai, Zhihui;Zhang, Lizhi
期刊:
Crystal Growth & Design ,2007年7(7):1216-1219 ISSN:1528-7483
通讯作者:
Jia, Falong
作者机构:
[Zhang, Lizhi; Jia, Falong; Xu, Hua; Ai, Zhihui] Cent China Normal Univ, Key Lab Pesticide & Chem Biol, Minist Educ, Coll Chem, Wuhan 430079, Peoples R China.
通讯机构:
[Jia, Falong] C;Cent China Normal Univ, Key Lab Pesticide & Chem Biol, Minist Educ, Coll Chem, Wuhan 430079, Peoples R China.
摘要:
In this communication, we demonstrated that the growth and assembly of TiO2 nanorods into hierarchical spheres could be realized on soft interface between water and chloroform in one pot. The synthesis was free of any surfactants or organometallic precursors or ligands. The resulting samples were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and high-resolution transmission electron microscopy. We evaluated photocatalytic activity of the hierarchical rutile TiO2 nanorods spheres on degradation of rhodamine B in aqueous solution under simulated solar light. It was found that the activity of the as-prepared TiO2 nanoarchitectures was about twice that of the famous commercial photocatalyst P25. Moreover, our method could be extended to prepare a series of inorganic hierarchical architectures formed through the assembly of nanorods, nanoplates, and nanoprisms on the interface of water/chloroform. This indicates that water and chloroform can provide a general soft interface platform for the growth and assembly of inorganic hierarchical nanoarchitectures.
语种:
英文
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高等师范化学教育改革与创新
作者:
曾艳;张文华;祝心德
作者机构:
华中师范大学化学学院 湖北武汉 430079
会议名称:
全国化学教师教育第三届学术研讨会
会议时间:
2007-05-18
会议地点:
西安
会议论文集名称:
全国化学教师教育第三届学术研讨会论文集
关键词:
高等师范教育;化学教学;教师教育
摘要:
化学新课程标准和初、高中新教材在全国多个国家级实验区的试验展开,标志着我国基础教育课程改革已进入新的、深入的阶段。新课程标准以促进学生的全面发展和培养学生的科学素养为理念,在课程设置、教学目标和知识体系上均做出了重大调整。教育的主要目标调整为使学生在知识与技能、过程和方法、情感态度和价值观三个维度得到统一和谐的发展。化学新课程的实施必然要求中学化学教师在教育观念、教学方式、教学行为等方面都要做作相应的转变,因此对化学教师教育也提出了全新的挑战。
本文从四个方面论述:1.高等师范化学教育的现状与发展。2.高等师范化学教育的展望与改革。3.高师化学教育课程的灵活性与多样化。4.化学教师职前培养和职后培训一体化。
语种:
中文
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分子筛MCM-48负载硅钨酸催化合成丁酮-1,2-丙二醇缩酮
作者:
张义军;王敏;杨水金
期刊:
化学试剂 ,2007年29(2):69-71,74 ISSN:0258-3283
作者机构:
[张义军; 王敏] 华中师范大学,化学学院;[杨水金] 湖北师范学院
关键词:
丁酮-1,2-丙二醇缩酮;催化;缩酮反应
摘要:
报道了以分子筛MCM-48负载硅钨酸H_4SiW_(12)O_(40)/ MCM-48为催化剂,通过丁酮和1,2-丙二醇反应合成了丁酮-1,2-丙二醇缩酮.探讨了H_4SiW_(12)O_(40)/MCM-48对缩酮反应的催化活性,较系统地研究了酮醇物质的量比、催化剂用量、反应时间诸因素对产品收率的影响.实验表明:H_4SiW_(12)O_(40) /MCM-48是合成丁酮-1,2-丙二醇缩酮的良好催化剂,在n(丁酮):n(1,2- 丙二醇)=1:1.6,催化剂用量为反应物料总质量的0.6%,环己烷为带水剂,反应时间45 min的优化条件下,丁酮-1,2-丙二醇缩酮的收率可达91.9%.
语种:
中文
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Low temperature synthesis and photocatalytic activity of rutile TiO2 nanorod superstructures
作者:
Wang, Yawen;Zhang, Lizhi* ;Deng, Kejian;Chen, Xinyi;Zou, Zhigang
期刊:
Journal of Physical Chemistry C ,2007年111(6):2709-2714 ISSN:1932-7447
通讯作者:
Zhang, Lizhi
作者机构:
[Zhang, Lizhi] Cent China Normal Univ, Coll Chem, Minist Educ, Key Lab Pesticide & Chem Biol, Wuhan 430079, Peoples R China.;S Cent Univ Nationalities, Coll Chem & Mat Sci, Key Lab Catalysis & Mat Sci Hubei Prov, Wuhan 430074, Peoples R China.;Nanjing Univ, Dept Phys, Ecomat & Renewable Energy Res Ctr, Nanjing 210093, Peoples R China.
通讯机构:
[Zhang, Lizhi] C;Cent China Normal Univ, Coll Chem, Minist Educ, Key Lab Pesticide & Chem Biol, Wuhan 430079, Peoples R China.
摘要:
Pure rutile nanorods were synthesized by hydrolysis of TiCl<inf>4</inf> ethanolic solution in water at 50 °C. The assembly of rutile nanorods could be controlled through simply changing the molar ratios of TiCl<inf>4</inf>, ethanol, and water, resulting in different superstructures with flower- or urchinlike morphologies. The resulting samples were characterized with X-ray diffraction, scanning electron microscopy, transmission electron microscopy, highresolution transmission electron microscopy, nitrogen sorption, and UV-vis diffuse reflectance spectrum. A possible mechanism for the growth and assembly of rutile nanorod superstructures was proposed on the basis of characterization results. More importantly, we found that those low temperature synthesized superstructures showed significantly higher photocatalytic activities than commercial photocatalyst P25 on degradation of rhodamine B in water under artificial solar light. This study provides a simple and inexpensive way to prepare high active rutile nanorods superstructures photocatalysts on a large scale. ©2007 American Chemical Society.
语种:
英文
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Diethyl 2,6-bis-(4-isopropyl-phen-yl)-4,8-dioxo-2,6,3a,4a,7a,8a-hexa- azaperhydro-cyclo-penta-[def]fluorene-8b,8c-di-car-boxyl-ate
作者:
Wang, Zi-Hua* ;Li, Juan;Qin, Jing
期刊:
ACTA CRYSTALLOGRAPHICA SECTION C-STRUCTURAL CHEMISTRY ,2007年63(8):o3615-o3615 ISSN:2053-2296
通讯作者:
Wang, Zi-Hua
作者机构:
[Wang, Zi-Hua; Qin, Jing; Li, Juan] Cent China Normal Univ, Coll Chem, Minist Educ, Key Lab Pesticides & Chem Biol, Wuhan 430079, Peoples R China.
通讯机构:
[Wang, Zi-Hua] C;Cent China Normal Univ, Coll Chem, Minist Educ, Key Lab Pesticides & Chem Biol, Wuhan 430079, Peoples R China.
摘要:
In the title compound, C32H40N6O6, the dihedral angles between the two fused five-membered rings in the glycoluril unit and between the two benzene rings are 72.5 (4) and 84.4 (1)°, respectively. © International Union of Crystallography 2007.
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