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人教版小学科学说课稿 小学科学说课稿万能篇一
下面我从教材分析、学情分析、教法与学法、教学流程及设计意图四个方面对这一课作一个简略的分析。
一、首先对教材的分析
《 …》单元… ,引领学生探究…,本单元知识的编排由浅入深逐步展开,先研究…,再……,
本课是在…的基础上进行教学的,本课教材共2页,分为3个部分,第一部分…;第二部分研究…,这一活动是要求学生根据材料来自行设计实验、检验推测。教科书设置了几个连续递进的问题,引导学生在…实验后,进行思考与讨论,并进行科学的推测。第三部分…本课的教学为后续学习…打好基础。
课程标准提出:要加强探究式学习和动手实践能力的培养,结合对教材研究,我将本课的教学目标设计如下:
(1)通过对…实验操作活动,学生初步认识……,明白……
(2)在对…的观察、操作、比较等活动的过程中,引导学生亲历…会…,掌握…
(3)在探究活动中,能积极提问、思考、阐述依据;乐于合作交流,养成细致的观察习惯和态度,培养…意识。
本课的主要科学词汇有:数据测量、对比实验、…
基于以上的分析,我将本课的重点确定为:通过…等活动,理解…,
由于…,我将难点定为:在设计对比实验中严格控制变量、并注意…
二、对学情的分析
五年级学生通过2年多的科学课学习,求知欲和参与科学活动的愿望明显增强。他们已具有了初步的分析推理能力,思维已由形象思维向抽象思维发展,但仍然需要直观形象作支撑。他们已经初步掌握了科学探究的过程与方法技能,学会了自己收集资料和进行课堂记录的习惯,大部分学生已会进行仔细的、持续的观察,学生在实验前已具备了提出假设,然后设计实验计划,最后进行实验验证的探究能力。但学生常常急于动手,过多地沉溺于动手的快乐中,而缺少理性思维,教学中教师要留足时间给学生思考,要强调实验前的推测、解释要有充分的依据,并认识到重复实验的意义。
五年级学生对于…是有一定认识的,生活中…,他们能够…;但缺乏系统的知识建构,还不能准确地说清楚…,大多数同学没有深入地研究、思考过…因此,以…活动为载体,引领学生在…中理解本课知识是可行的,也是必要的。
…实验的方法,学生已接触过,有一定的了解。但学生的思维还缺乏严谨性,知识迁移的水平也有较大的差距,因此学生设计对比实验,尤其对于实验的细节还是有一定困难,进一步掌握控制变量实验的技能等都需要老师的指导。他们还将学习用图画、文字等方式记录观察现象,用表格处理数据。
三、说教法与学法
科学课堂好比引导学生过河,教学中必须运用好恰当的教学策略,为学生提供"过河"的下脚石,但又不能越过这个度,教师只着重从内容、方法上作启发式点拨,引导学生自主探究。根据《新课程标准》以培养学生的科学素养为宗旨,科学学习要以探究为核心,结合本班学生的实际情况,本课我从生活中已有的感性认识出发,适当创设一些教学情景,主要采用"引导-探究"的教学方法,同时综合运用讨论法、实验观察法,并结合多媒体来组织课堂教学。
与教法相适应,为充分发挥学生的主体作用,落实科学教学的开放性,本课主要采用自主探究法,让学生分组实验,小组合作交流,思维互补,在课堂上"授以鱼",更"授之以渔".本课我会特别关注学生参与活动的态度、解决问题的能力和创造性。教给学生观察、推测、探究、验证的科学学习方法。重点培养学生善于动手、善于观察、善于思考的科学学习习惯。
为了促进学生有更为丰富的观察手段,积极探究,达到理想的教学效果,我将在课前作如下充分的准备:首先我会精心制作好多媒体课件,…小组探究准备:实验记录表,…
为简约课堂教学,以平常心上好常态课,()落实科学作业进课堂,我会灵活运用省教研室与省教材中心合编的作业本。里面的活动记录作为课堂探究记录表使用,并根据具体情况进行适当调整;里面的课堂练习作为教师和学生了解自己达到教学要求程度的练习题。
四、说教学流程及设计意图
教学有法,教无定法,贵在得法,本课在启发性原则和主体性原则的指导下,让学生经历一个发现问题,提出问题,解决问题的科学探究过程。本课我主要通过四个环节来展开:
1、创设情景、激趣导入;
2、提出问题、探究新知;
3、设计实验、深入探究;
4、拓展延伸、深化认识。这四个环节的时间比预设为3、10、17、5分钟。具体阐述如下:
第一个环节是创设情景、激趣导入。
著名教育家于漪说得好:"课的第一锤要敲在学生的心坎上,或像磁石一样把学生牢牢吸引住,让学生产生强烈的求知欲".
教学开始,我出示…,并提问:
当学生还在回味…带来的视觉上的冲击时,我抓住这个机会让学生根据已有知识和经验作出自己的猜测。
然后,让学生自己提出问题,使他们真正参与到科学探究中,训练孩子们的思维能力,了解学生的前概念水平。
在此引出今天的新课,并板书课题。
第二个环节是提出问题、探究新知…
这一环节,我一步步引导学生思考
1、观察……
2、小组合作记录讨论……
(这一环节的设计意在学生在……过程中,发现问题,并作出自己的推测。为下面的探究活动作铺垫,进一步激发学生探究真相的欲望)
第三个环节是设计实验、深入探究…
这是本课教学的中心环节,也是突破重难点的重要环节。关键就在与设计好实验,控制住变量,在学生掌握大量事实资料后,通过交流比较分析,抽象归纳形成新概念。
(1)小组汇报并确定实验方案(要求学生说出方案设计的理由)
(2)师指导:
(3)学生分组实验,教师进行巡视和指导,亲身介入并认真观察学生的科学探究活动,随时掌握他们在活动中所取得的进展、面临的困难和出现的问题。对活动的状况及时作出判断,并决定应当采取的指导策略。
实验结束后,汇报实验现象,我在课件上展示实验结果,然后引导学生交流:先让学生说说他们自己的发现和总结出来的结论。在他们原有的结论上加以指导和纠正。
这样对不同实验方法的思考与比较,点燃学生思维的火花,提高了学生的科学素养。
(4) 师生小结:
1、小组再实验观察、记录现象。
2、对实验现象进行分析讨论。
3、归纳整理,对教学效果及时进行反馈,了解学生的探究情况。
(这一环节的设计意在让学生在动手之前先动脑,动手之后也动脑,给他们充分的思考空间和探索空间,以培养学生的观察,分析和概括能力。巩固学生知识;提高探究能力,体会反复实验的重要意义。)
课到此时,进入第四个环节:拓展延伸、深化认识
"学以致用",学习知识的目的就是希望学生在掌握知识后把它转化为技能,去解决新的问题。多媒体展示几个常见而没有认真观察过的现象,学生解释。
(这一环节的设计意在:进一步促使学生对大千世界的热爱和精细观察,活跃课堂气氛,培养激发学科学用科学的兴趣。鼓励学生积极主动的进行课外探究活动,使学生养成课外坚持探究的好习惯)
最后2分钟让学生完成课堂练习,教师巡回面批,对教学进行评价。
为集中学生注意力,突出教学重点,本课我设计了动态的图文式板书,直观的图画,简洁的文字,结合课件展示,使学生一目了然地看清知识结构,形成完整的认知体系,加深对新概念的构建和理解。
总的来说,我这节课,突出了以下几点:
1、体现科学要以探究为核心,在课堂上,我充分让学生……;
2、注重材料的结构性。在某种程度上说,科学课堂的有效性,往往被材料所控制,在我的教学中,这些教学材料在适当的时候分阶段地呈现或分发给学生,教师注意做好材料在实验前的保密工作。在学生实验完成后,准备反馈交流前及时提醒学生整理回收材料,完善科学记录单,使学生养成一心一意地倾听的习惯。
3、在本课的教学中,我还注重评价机制的运用,本课我在教师观察、与学生谈话、指导学生实验及报告单填写等过程中,了解学生实际的学习和发展状况,并运用激励性语言给予适当的鼓励,倡导学生进行自评和互评,让学生在评价中学会实践和反思、发现自我、欣赏别人。
人教版小学科学说课稿 小学科学说课稿万能篇二
各位评委老师大家好:
我是来自临川实验小学的万国奇,我说课的是小学科学六年级下册第一单元第一课《杠杆》。下面我将从以下几个方面进行我的说课。
首先说教材:
杠杆是《简单机械》这一单元的第一课,主要研究杠杆的有关知识,是在学习了天平基础上进一步研究简单机械,是学生顺利操作、设计简单机械的重要一步,也是学生形成合理知识链的重要一环。对下一步学习复杂的机械具有着重要意义。
本课从“妍妍要打开饼干罐盖子”的问题出发,通过三个活动“怎样更容易把盖子打开”,“研究罐子凸起边缘的作用”,“用杠杆做个起重机”引导学生认识杠杆,通过活动探究杠杆原理,激发学生科学探究的兴趣.
说教学目标:根据上述教材结构与内容的分析,以及《教学大纲》的要求,在考虑到六年级学生已有的知识和认知结构的基础上 ,我制定了如下教学目标:
知识目标:了解杠杆的组成,了解省力杠杆和费力杠杆,知道利用机械可以提高工作效率。
能力目标:通过实验培养学生分析问题,解决问题的能力。并且他们的观察能力、思维能力、语言表达能力也能得到一定提高。
情感目标:通过学生的实验活动,使学生获得自主、合作、探究的学习态度,培养学生学习科学的兴趣,充分调动学生学习的积极性,并且建立良好、融洽的师生关系。
接下来说教学重难点,在本着课程标准,吃透教材的基础上,我确立了如下的教学重点、难点:
重点:知道杠杆的组成,了解省力杠杆和费力杠杆。
难点:找出科学规律。区分生活中省力杠杆和费力杠杆。
说教法:
那怎样在课堂教学中实现以上教学目标、突破重点难点呢?我采用由浅入深,由简单到复杂,由已知到未知,循序渐进的顺序,重点运用探究式、互动式的方法去教学,逐步使学生学会掌握杠杆概念以及应用。
说学法:
学生要学好这一课,我应该这样指导学生的学习方法??
1.以探究活动为科学学习的核心,安排相关情景与三个科学探究活动,为学生提供足够多的自主探究机会。
2让学生通过参与提出问题,猜想假设,制定计划,观察实验,收集整理,分析归纳,表达交流等过程,在亲历中体验感悟和内化,感受学习科学的乐趣。
说教学过程:
为了更好的实现教学目标,设计符合六年级学生学习特点的教学过程,本节课我将进行如下教学:
通过一幅妍妍要打开饼干罐盖,但又感到罐盖很难打开的情景,以及主题人物的对话,探讨打开罐盖的方法,从而引起学生的思考。
(一)初步认识杠杆
开展活动一,怎样更容易把盖子打开?先让学生直接动手试一试,在利用使用工具打开。然后让学生分小组进行讨论,把盖子打开的最佳方案写下来。使学生体会使用杠杆的感受。
开展活动二,研究罐子凸起边缘的作用。讲台上放置俩个罐子,一个没凸起边缘,一个有凸起边缘,让学生比赛把盖子打开,小组讨论结果,使学生明白如果没有凸起的边缘即支点,尽管有一支螺丝刀也是不能打开的。对杠杆的结构有了更为全面的认识。结合资料卡和示意图,让学生直观的认识、理解杠杆的科学定义,认识杠杆中的支点、动力作用点和阻力作用点。
(二)开展活动三,研究杠杆的作用
用杠杆做个起重机的活动,其实就是研究杠杆支点的活动。 小组总结交流实验结果,配合学生演示,共同总结我们的发现。得出结论。学生记录杠杆的秘密,即:在什么情况下杠杆省力?在什么情况下杠杆费力?在什么情况下不省力也不费力?并发挥想象力,利用得出的规律揭示阿基米德为什么会说:“给我一个支点,我就能撬起整个地球。”
在这一过程中,学生像科学家进行科学研究一样,经历了一次科学探究过程,培养了学生的实验设计、实验操作、分析归纳的能力。这也是本节课的重点和难点。同时也运用了 “猜想、实验、论证、交流”教学模式。
(三)探讨杠杆在生活中的应用
学生根据所学知识,分清生活中,哪里用到省力杠杆,哪里用到费力杠杆,哪里用到等臂杠杆,找出这样做有什么好处。
了解古代汲水的桔槔,金字塔建造使用杠杆情况。理解杠杆是人类征服自然界的武器。
(六)、课堂小结:
这节课我们学习了什么?让学生分组讨论总结,然后我再进行补充,总结性复述,最终把课堂教学传授的知识转化为学生头脑中的知识。
总之,教学过程一直贯穿面向全体学生的思想,以探究活动为科学学习的核心,培养尊重事实和善于质疑的科学态度,发展创新思维。
(八)、板书设计:
这是我的板书。一个好的板书,可以使人一目了然,清晰易懂。
人教版小学科学说课稿 小学科学说课稿万能篇三
各位老师,大家好!
今天,我说课的课题是小学科学教科版五年级上册第二单元《 光 》第 3 课时。下面我将从教材分析、教学理念、教法学法、教学过程等四个部分进行说课。
在本课内容之前学生探究了光和影的关系,建立了一些感性的认识。在这一基础上再研究光是怎样传播的。我认为编者的意图是让学生巩固光和影子的科学关系,又为后续学光在传播途中碰到障碍物会怎样的研究打下基础,使学生的动手能力、思维能力、创新能力、探究精神得到全面的发展。
这一课的内容分二大部分。第一部分是“光是怎样照到物体上的”;第二部分是“验证光的传播路线”。
五年级学生的已经有一定的科学素养,同时对实验课兴趣非常浓厚。但是在思维上,逻辑性、严谨性不强,考虑问题不周全,实验操作,对学生而言都是很好的锻炼。本节课无论是实验设计还是实证光是直线传播的探究活动,强调让学生在教师的指导下通过亲身经历、发现、探究、推测、验证的科学探究过程,发展学生对科学的理解力,思维力及多方面的素养。
根据“科学课以培养小学生科学素养为宗旨,积极倡导让学生亲身经历以探究为主的学习活动”的课程理念结合学生的实际情况。
我将确定以下教学目标:
1、科学概念:光是直线传播的。
2、过程与方法:有依据地推测光的传播路径;设计验证光是直线传播的实验;利用光的传播规律解释为什么会有影子。
3、情感、态度、价值观:培养学生爱思考的习惯,以及善于思考的能力;知道推测要有依据;在实验中能认真观察、勤于思考,根据实验结果实事求是地进行分析、推理。
本课教学的重点是通过实验验证光是直线传播的。
难点:寻找假设的依据说明光是直线传播的。
教具准备:手电筒、3张在同一位置打孔的长方形卡纸、屏、空心管和直管。
教师演示的图片和课件。
有人将科学比喻为引导学生过河,教师在教学过程中,必须运用好的教学策略,为学生提供“过河”的下脚石,但又不能越过这个度,教师只作启发式点拨,引导学生自主探究。根据《新课程标准》以“培养学生的科学素养”为宗旨,及结合学生的实际情况,我将本课的教学法确定如下:
从教的方面来说,本课主要采用“引导—发现—探究”的教学方法。学生是学习的主体,让每位学生都能像科学家那样研究科学,从而让学生学到探究科学规律的本领。本课通过让学生对光是沿着直线传播的实验观察、研讨、推测、验证、解释。为了能使教学目标得以落实,取得良好的教学效果,本课中我还同时综合运用了(讨论法、实验法、探究——研讨法等)多种教学方法来组织课堂教学
从学的方面来说,本课主要采用(观察法、探究实验法、小组合作、自主探究法等)多种学习方法,指导学生通过多种感官对光传播的现象进行有意识的初步认识,充分发挥学生的创造力,使学生能独立进行探究实验,能充分发挥手、脑、眼的功能,从而获取新知识,培养技能技巧。从小组合作中培养学生的合作意识和探究意识,使他们乐于交流,并善于发表自己的意见。
我的教学设计是以“探究、开放、自主、合作”为基本指导思想的。下面是我对这节课的教学设计的说明。
(一)、创设情境,提出问题
活动一
创设情境,引导学生观察日常生活中光照的现象(出示图片及课件)
清晨,太阳出来,房间洒满了阳光;黑夜,打开手电筒,灯光照亮了前面的路;在观察中提出问题。这些光是怎样到达被光照的物体上的?组织学生进行讨论、猜测,激发学生利用实验获得证据,证明自己的观点是否正确。
创设这样的问题情境引入,使学生的思维产生强烈的碰撞,这一锤就敲到了学生的心坎上,充分激发了学生的探究欲望,可以很快使学生积极思维,进入科学探究的活动中来,达到了预期的教学目的。
(二)组织探究,得出结论。 (重点)需修改
活动二
出示有结构的材料,组织学生讨论实验的方法,猜测实验的结果。因为教科书上学生操作的验证实验,器材简单,操作容易,可以放手让学生自行合作制定实验方法和步骤,自行操作,但要求实事求是的记录实验结果,在图中的卡纸上直接用箭头标出光前进的路线。在过程与方法中推测依据很重要。通过实验得出小孔在一条直线上,手电筒的光就能到达最后的屏上,形成小斑点。否则就不会有此结果。
在这一环节的活动中,先让学生自主合作、大胆猜测光的传播是否沿着直线的方式进行的问题产生认知的矛盾,也就有了探究、验证的需求。这时,教师让学生进行验证也就水到渠成了。同时学生的小组合作学习在这个环节中所起到的作用也是科学、有效的。小组活动中,同学们在小组长的安排下,有的到实验材料区去选取实验所需的材料,有的负责记录,有不同的看法互相交流,然后小组长把全组的意见整理、汇报,得出了“光是直线传播”这一结论。这符合学生的认知规律,又充分的体现新课程自主探究的精神。
(三)扩展探究,培养热情
接着激发学生用其他的方法也来验证光的传播路线,可以是直管和弯管的对比观察,直管眼睛就能看到另一头的光,弯管就不能,进一步证明光是直线传播的。同时提醒学生不要用眼睛只对很亮的光源。还要给学生留个思考的空间,说说还有哪些方法验证光的直线传播。再利用光是直线传播的理论解释影子总是在光的背面的道理。为了更有效知识延伸,还可以用课件图片出示,光的传播速度以太阳为例,进一步扩展了学生的探究活动,使学生所形成的概念得以巩固。令科学知识从书本走向实践,由课堂走向社会。
(四)、板书设计
为了紧扣教学目标,突出教学重点,我用简洁明了的词语进行板书,概况了本节课的主要内容,让学生一目了然,让对所学知识留下深刻的印象。
人教版小学科学说课稿 小学科学说课稿万能篇四
“自主、合作、探究”教学模式,是新课改的亮点,也是我校这几年在武主任领导下进行的一个课题实验。实施“自主、合作、探究”这一模式,目的是培养学生永不满足、追求卓越的科学态度和勇于质疑、善于提出问题、解决问题的学习习惯。在操作过程中,首先要有和谐的学习氛围,教师要放下架子,让学生把老师当作知心朋友,当作学习伙伴,鼓励学生大胆发表自己的观点和想法,对于学生提出的个别离奇古怪的问题,教师的态度应是不指责,不回避,并适当地给予肯定和引导。其次是在学习的过程和体验中,关键是能否引导学生对所学知识进行选择、判断和运用。最后就是鼓励学生合作学习,培养学生的积极参与意识。特别是采取小组合作的形式,更能取得良好的教学效果。这种模式能改变传统教学压抑学生兴趣和热情的状况,能让学生在平等的环境下“自主、合作、探究”,讨论总结,获得成功。
究竟怎样的教学模式,才能适合新课改的要求,才能有利于学生的可持续发展?我们实践的“自主、合作、探究”这一教学模式,正是符合新课改精神和素质教育要求。情境设置、动手实践、主动探索、合作学习,这一教学方法已经被越来越多的教师所认同和采用。但是,情境如何创设,才能发挥其导向作用呢?
再如,小组合作学习。何时采用“小组合作学习”是最恰当时机?对于动手实践,特别是新课改的年级,我们不能被表面上的热热闹闹所沉醉,而应更关注学生究竟在做什么?活动产生的效果又是什么?而对于主动探索,我们建议采取以问题为中心,以发现为目标的开放性学习方法,但是如果把每一个问题都当作探究来处理,不仅时间条件不允许,也可以说把探究神秘化、复杂化了。针对以上问题,结合我们的教学实践,谈一谈我在执教《灯泡亮了》这节课所做的一点尝试:
我先采用"问题情境——建立模型——解释、应用与拓宽"的模式展开。好的问题情景是引导学生进入科学探究的火把,我们要善于用产生于真实背景中的学生感兴趣的问题启动学生的思维。在教学过程中,先利用学生熟悉的生活情景和感兴趣的事物迷人的夜景作为教学活动的切入点,使他们能迅速进入思维发展的“最近区”,掌握学习的主动权。达到自评与综合评价的目的。科学课程目标的重点在于培养学生的态度和能力,所以评价时,不应过于看重学生所获得的知识的多少及作品的优劣,而应特别关注学生参与的态度、解决问题的能力和创造性,关注学习的过程和方法,关注交流与合作,关注动手实践以及所获得的经验与教训,同时要强调评价的激励性,鼓励学生发挥自己的个性特长,施展自己的才能,努力形成激励广大学生积极进取、勇于创新的氛围。评价可采用多种形式,如书面材料的评价与对学生的口头报告、活动、展示的评价相结合;教师评价与学生的自评、互评相结合;小组的评价与组内个人的评价相结合等。
基于这一评价理念,本节课评价方式灵活多样,各种评价方式有机结合。例如:在“创设矛盾情境,激发学生观察小灯泡.”环节采取教师评价与学生的自评、互评相结合,在“布局自由心境,激发学生连接小灯泡”,“建构对比环境,激发学生讨论小灯泡”,这两个环节采取书面材料的评价与对学生的口头报告、活动、展示的评价相结合;让学生在评价中学会实践和反思、发现自我、欣赏别人。总之,我们认为“自主、合作、探究”这一模式的教学,是通过展示学生的思维过程,达到取长补短,共同提高,是一种平等的同伴互助,共利互惠的学习关系,是学生求知快捷而科学的通道。
通过本堂课的学习,我感觉到孩子对科学探究活动有着强烈的兴趣,身为一名科学教师我们应该在平时留心学习和积累各种科学知识,这样才能在课堂上游刃有余的指导和引导学生开展科学探究活动。在指导和评价孩子的时候,老师说的话一定要尊重科学的严谨性,对于某些没有定论的问题,不要做肯定性的回答,而应该是对孩子进行一个探究方向的引导。课堂中,教师要善于抓住孩子的兴奋点,适时的引导,让孩子在科学探究活动过程中合作、互助、自主的进行探究活动。在今后的教学中我将不断的学习、探索、实践。
从课堂情景来看,学生主动完成了教学任务,体现了新课标要求的“自主·合作·探究”学习模式,更难能可贵的是孩子抓住课堂上“帮别人做线路”这一情景,生成了“帮别人做事不如教给别人做事方法”这样一个道理。在老师提供的教学材料面前,孩子主动学习的机会与风采得到了充分的体现。在组成“电路”的同时,孩子的合作能力与合作愿望进一步得到了张扬,培养了良好的学习习惯与学习兴趣。课堂的结束并不是这类问题的结束,只是给这类问题开了一个好头,留给了学生进一步学习的空间与机会。
孩子的动手能力、思维面、深度及制定方案的能力都有待进一步提高。从这里也可以看出咱们孩子的动手能力与动口能力的失调,在这一方面对孩子的锻炼一直是少得可怜。课堂上老师引导学生自主学习的功力还有待于进一步提高。我认为在课堂上以疏导学生为主,这样可能在体现学生自主学习上会做的更好。
人教版小学科学说课稿 小学科学说课稿万能篇五
今天我说课的主题是《物质的变化》。本课是属于物体与物质范畴,针对六年级这样高年级的学生展开教学的,学生经过“物体—材料—物质”这三个层次来进行这方面的学习,物质的变化主题已进入第三层次,通过观察与探讨,了解物质到一些基本性质与变化过程,使学生的认识逐渐由具体向抽象过渡。
学生对于一些物质存放久了,就会发生变化已经有了一些零散的认识和知识储备,比较熟悉物质不是一尘不变的,都是存在变化这个观点,但对于这些变化到底什么原因造成的,在科学上我们应该如何对其进行分类等等在系统认识上还是比较模糊的。
1、 了解科学探求的结果应该是可以重复验证的。
2、 懂得交流与讨论可以引发新的想法。
3、 能用简单器械作简单的观察实验,并做实验纪录。
4、 会查阅书刊及利用其他信息源。
5、 能反思自己的探求过程,将探求的结果与假设相比较。
6、 能对研究过程和结果进行评议,并与他人交换意见。
:
1、 了解物质有三种常见的状态:固态、气态、液态。温度的改变可使物质的状态发生变化。
2、 知道物质的变化有两类:一类仅仅是形态的变化,另一类会生成新的物质。
1、 想知道,爱提问。
2、 愿意合作与交流。
3、 乐于用学到的科学知识改善生活。
4、 关心日常生活中的科技新产品、新事物,关注与科学有关的社会问题
六年级的学生对学“科学”已经有了一定的经验,在解释事物现象方面会有更多自己的见解,能对自己感兴趣的事物提出想探求的问题,并能运用实验、观察等手段进行探究性的学习,寻求解决问题的方法。他们绝对不希望被老师牵着鼻子走,却更希望老师能跟着他们“走”,学习自己想学的知识。因此我在教学设计上就更注重尊重学生,发挥学生的特长,让他们做想做的事,说想说的话,营造一个民主的教学氛围,让学生在毫无压力下,从学习研究中充分抒发自己的见解,从而获得身心的愉悦。
根据学生的认知规律和知识水平我将认识物理变化和化学变化的区别,认识典型的化学变化作为本主题的教学重点,而将通过实验探求物质变化的秘密应该是学生需要突破的教学难点。
本课我安排3教时来完成,我将为学生准备必要的媒体资料以及实验所需要的实验用品等好让学生更好地进行本课的学习活动。
本主题可以分为三各部分,每个部分一课时。
第一部分的教学目的是通过“变”来“变”去的盐,认识可逆的变化,认识青铜器的生产,制造蜡星星等活动进一步让学生了解这是什么变化,科学定义这一类变化——物理变化的根据。
我打算采取实验的方式,让学生通过小组合作交流的形式,让他了解到向盐这样变来变去的变化称为物理变化,以及物理变化的特征等等,培养他们通过实验进行探究的能力以及学会搜集整理所学知识的得出结论的能力。
第二部分的教学目的是通过常见的铜生锈的现象,通过实验探究金属生锈的原因的基础上通过收集信息进行综合分析的方法。通过小组的质疑方式,让他们从各个方面了解到金属生锈是一种化学变化,并试着自己得出如果是一种化学变化的话,它应该具备什么样的特征,培养他们合作交流自主设计实验这样的能力。
第三部分的教学目的是通过观察和实验,看燃烧的蜡烛,让学生知道化学变化会伴随着什么样的典型特征。通过这些典型的特征变化,联系生活中的其它变化,最终得出:只是形态上的变化,不产生新的物质的变化是物理变化;而产生新物质的变化是化学变化。我打算采取利用科学欣赏的形式再现历史上著名的科学家拉瓦锡的'实验这样的方式,让学生通过动画的形式对研究物质在燃烧中会发生哪些变化有直观的印象,探讨在此过程中发生各种变化的原因,对以后进行实验重复验证蜡烛燃烧的变化,有着积极的暗示作用,引导学生进行自主研究的形式,让他了解到科学的结论具有可重复验证,培养他们今后养成通过实验验证结论的意识和自主探究的能力。
因为小学科学课程是以培养学生的科学素养为宗旨的,倡导以探究为主,学生通过自主实验的过程中既可以使其对什么是物理变化和化学变化,以及这两种变化有什么样的特征有了直观地认识,同时又可以在自主探究和小组合作过程中 获得积极的情感体验,有助于培养他们的好奇心和探究欲,对于以后养成通过实验自主探究日常生活和学习中遇到的各种问题的习惯,有潜移默化的作用。
根据学生的经验以及兴趣爱好围绕“科学就是提出问题并想办法解决问题”这个思路,进行教学设计。
“兴趣是最好的老师”,我首先是利用多媒体创设情景让学生置身于真实之中,激发学生的学习兴趣,调动他们的积极性和主动性,使课堂教学 “活”起来。
在教学过程中,我尽可能多地让学生通过多种活动的机会学习,激发学生主动参与科学学习的兴趣,让学生在探究中学习,在体验中学习。
第一课时:“变来变去的盐”需要为学生准备:酒精灯,蒸发皿,烧杯等,“煮海为盐”、“青铜器的制造”的教学的短片。
我的意图是先通过问题“我们知道盐能溶解在水里,溶解在水利的盐还能‘变’出来吗?” 激发学生的好奇心和探究欲,让学生充分利用自己的前经验,积极的根据生活经验积累进行猜测:得出盐水是能变回盐的。如果学生在此遭遇困难教师可以通过“回想水的汽化现象”给学生进行提示。此时再通过小组合作想办法自己设计合理的实验来验证结论。在此基础上通过媒体出示中国古代人“煮海为盐”的历史和方法,让学生在实验和媒体资料的基础上分析分离水与盐的方法和原理。在这个过程中教师要演示酒精灯的使用方法,酒精灯学生生活中不常见,又是小学阶段一个重要的实验操作,同时考虑实验的安全性,为了更有效率的进行实验所以由教师演示规范,再让学生通过小组通过合作实验进行学习。他们会发现盐能溶解于水,又能从水中提取出来,这样的变化过程是可逆的;继而进一步思考最终发现:生活中还有很多变化过程是可逆的。通过收集和整理有关变化过程的相关资料来加深学生对可逆变化的认识,并且做好资料的记录和整理,养成实验中随时记录的好习惯,并为以后的学习做好准备。通过青铜器的制作过程的录像资料简介以及如何利用可逆的变化之作蜡星星。通过这样的方式让学生在学习过程中能动性,创造性得到充分的发挥,培养他们的动手动脑的意识。
第二课时:失去光泽的铜镜,我将为学生准备铁丝、细砂纸、吸水纸、白磁盘,出土铜镜的短片等
铜镜失去光泽,铁钉上锈等金属生锈现象是生活中常见的事,关键是如何了解他们上锈的秘密。我通过录像短片让学生直接思考,来预测原因,在此基础上考虑怎样提高实验设计比较金属生锈与否的实验,深入到它们的里面,了解事物之间的关系,才能上升到理性认识,形成概念。通过进行对比实验进行研究,通过金属存在的环境差异,预测可能出现的现象,因为此实验当堂课不能完成,所以此时教师可以延迟评价实验的结果。
我的意图是在学习过程中有竞争才有进步,学生争强好胜的心理使他们的探究热情空前高涨,争相尝试各种方法。学生的实验只要是合理的我都给予肯定,从而使学生明白到解决问题的途径是多种的。学生在探究的过程中,体会了学习科学的乐趣,增长了科学的探究能力,获取了知识,形成尊重事实的科学态度。
在此基础上通过观察生锈的铁和铜等让学生了解铁与铁锈、铜与铜锈的区别。这个地方学生可能从很多方面进行比较,比较杂乱且有的毫无价值,所以教师可以通过实验表格让学生从颜色、光泽、软硬等方面进行重点观察,让他了解到这种变化是产生新物质,并不仅仅是形态的变化,为以后第三颗的学习埋下伏笔。同时根据金属都会生锈的现象,以及生锈的秘密,回想在生活中人们是怎么来处理金属生锈的问题的,让科学回应于生活。此时可以通过补充这方面的资料让学生进一步了解在生活中还有哪些防锈措施,拓展学生的知识面。
铜镜失去光泽是一种可以看得见的产生新物质的变化,而生活中很多的化学变化人们不容易察觉,所以在第三个部分设计了常见的燃烧现象让学生进行分析。
第三课时:蜡烛的燃烧,我要为学生准备:蜡烛、烧杯、澄清石灰水等、拉瓦锡实验的短片
蜡烛的燃烧非常常见,但越是这样人们越有可能认为是理所当然而不去思考他所蕴藏的科学含义。
苏霍姆林斯基曾经说过:在人的心灵深处,都有一种根深蒂固的需要,就是希望自己是一个发现者、研究者和探索者,在儿童的精神世界里,这种需要特别强烈。
我的设计意图是:先通过一个问题:“在生活中的常见的燃烧的现象,就以蜡烛燃烧为例在此过程中,蜡烛燃烧会发生什么样的变化?”让学生通过观察燃烧前和燃烧中蜡烛的变化,猜测燃烧掉的蜡烛变成了什么。在此过程中要提醒学生注意安全,如果失火了,应该赶快用湿毛巾来灭火。之后可以通过让学生讨论如何通过实验进行验证。
(1)罩一个烧杯与燃烧的蜡烛上方,看烧杯有什么变化
(2)罩一个在内壁涂有澄清石灰水的烧杯在燃烧的蜡烛上方,看烧杯有什么变化
(3)用一个白瓷板置于燃烧的蜡烛上方,看白瓷板底部有什么变化 让学生考虑燃烧掉的蜡烛是不是什么都没了?学生通过小组讨论交流互相质疑加深了学生对新知识的理解。
然后通过录像重放当年拉瓦锡验证的燃烧的实验,通过这样直观的实验使学生更为深刻地了解燃烧的本质。了解到燃烧会产生新的物质。同时让学生结合前面的所学拓展了解还有那些是产生新物质的变化。
一类像盐水转换为盐那样,是可逆的变化,不产生新物质的变化。一类是像金属生锈和燃烧现象一样产生了新物质的变化。
让学生了解物理变化和化学变化的关键是是否产生新的物质。这样就将普通常见的现象总结成为一个普通的规律,让学生的认识从感性认识上升到理性认识的阶段。
科学课的目的是为了培养学生的科学素养,这是一个长期的过程,不可能仅仅从课堂上来解决问题,所以我布置了一个小任务:收集有关物质变化的资料,让学生回去完成。因为收集相关资料并进行筛选的能力也是科学课所必备的,在下一堂课进行交流汇报和讲评,这样就使科学课从课堂延伸到课外。同时也为下个单元整理信息,让我们更有效的学习,作铺垫。
出示板书设计。
物质的变化
盐到盐水:可逆的变化 物质形态发生改变,不产生新物质——物理变化
铜生锈
铁生锈 :不可逆的变化 产生新物质的变化
燃烧
我的设计是从现象到本质,让学生清楚物质变化的分类依据。
以上是我对《物质的变化》这一主题的教学思路,请各位老师给予批评指正。谢谢大家。
人教版小学科学说课稿 小学科学说课稿万能篇六
《温度和温度计》是教科版《科学》教材三年级下册第三单元第一课的教学内容。它由4个活动构成:比较冷热程度不同的水、观察温度计、摄氏温度的读写、读出温度计指示的温度。摄氏温度的读和写,是训练学生的认读和记录,教材进行举例,重点区别零上和零下。指导学生准确使用温度计属技能训练。它与后一课时测量水温的方法有所不同,前一方法适用范围更广。
学生在日常生活中对温度有一定的了解,本课的教学从生活实际出发,充分调动学生的已有生活经验来搭建知识的结构。教师在教学过程中,让学生愉快地探究知识,在已有的基础上有所提高,使他们感悟到科学的乐趣,达成了目标。
本教学在以学生探究为核心,以培养学生科学素养为宗旨的理念指导下设计教学目标:
1、科学概念:温度表示物体的冷热程度,物体的温度可以用温度计测量;常用液体温度计是利用玻璃管内的液注随温度变化而上升和下降来测量温度的。
2、过程与方法:观察和研究作为测量工具的常用液体温度计的主要构造;识读温度计(模型)刻度上的数字,并把刻度上的数字与更热或更冷的温度联系起来。
3、情感、态度、价值观:理解测量工具使用规定的意义,并愿意
遵守这些规定。
本课教学的重点是经历比较观察温度计的过程。摄氏温度的读和写,训练学生的认读和记录温度是难点(特别是零下的温度),要增加一些几组温度加以训练,运用模型等方式,尽量结合运用,强化训练,提高课堂效益。
(一)、比较水的温度
1、比较冷、热不同的五杯水,请学生用手触摸感知哪一杯温度高,哪一杯温度低?提示温度是感知物体的冷热程度的。
由于手指获得的感觉是不同的,也是不能进行准确判断的,那有什么办法可以准确地知道物体的冷热程度呢?引出测量温度的常用工具——温度计。
(二)、观察温度计
出示温度计,我们要正确使用温度计,首先必须要认识这个温度计,了解它有哪几个部分组成?
1、学生观察温度计的构造。提醒学生观察中的注意事项:观察时注意温度计要小心拿放,谨防破裂。如果温度计的管子劈裂,请立即告诉老师。确保学生在学习活动中的安全。
2、汇报交流。根据学生汇报时的情况,教师适当补充讲完整:温度计主要由玻璃管、玻璃泡、刻度、液柱四部分组成
3、用手捂住温度计的玻璃泡,观察温度计产生的变化。放开手等一会儿再观察。汇报交流。
(三)、摄氏温度的读和写
1、请学生读出讲台上某一杯水的温度,并结合学生生活:广播、电视中的天气预报员是怎样预报天气的?
2、“21摄氏度”怎么写?学生读一读,写一写。
(四)、测量水的温度
1、准备一杯冷水和一杯热水,先用手预测(不要将手伸进杯里,也免烫伤),并将预测的结果填写在2号卡片上。
2、用温度计实际测量这两杯水的温度,也将结果记录下来。
3、交流测量情况
4、认识温度计的作用——能给我们带来准确的信息,我们应尽量多使用工具。
(五)、拓展延伸
1、教师提出问题:快速配制半杯一定温度(如350c)的水,引起学生的学习兴趣。
2、让学生快速配制半杯一定温度(如350c)的水。
(1)小组讨论配制的方法,并记录在3号卡片上。
(2)学生实际操作,并记录下每次配制的温度情况。
3、汇报配制的情况,教师点评。
4、学习快速配制的方法,并改进自己的配制过程(先测出冷水和热水的温度,按照一定数值估计进行)。
人教版小学科学说课稿 小学科学说课稿万能篇七
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