新人教 高一化学上教案册物质的量浓度

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第一篇:新人教 高一化学上教案册物质的量浓度

★第三课时

[复习]在实际生产和科学实验中,固体往往要配成溶液才能使用,浓溶液也常常须稀释到一定浓度才能满足需要,有关溶液的配制在初中我们就已学习过,即一定质量分数的溶液的配制,请大家回忆有关知识后,思考并回答以下问题。

[投影]配制200 g 5%的NaCl溶液,需要哪些实验用品和进行什么样的操作? [学生考虑并回答] [投影列出答案]

[仪器]天平(含滤纸)、药匙、玻璃棒、小烧杯、量筒、胶头滴管 步骤:1.计算,2.称量,3.溶解。

[导入]物质的量浓度和溶质的质量分数一样,也是用来表示溶液组成的。如果我们要配制一定物质的量浓度的溶液,所需容器和步骤是否和配制一定质量分数的溶液一样呢?这就是我们本节课所要解决的问题。

[板书]

四、配制一定物质的量浓度的溶液

[教师]下面,我们以配制500 mL 1 mol·L-1的Na2CO3溶液为例来分析配制一定物质的量浓度的溶液所需的仪器和步骤。

[讲解]溶液是由溶质和溶剂组成的,要配制一定浓度的溶液,首先需要算出溶质和溶液的量。此题需要的原料是Na2CO3和水。

[请同学们计算出所用Na2CO3的质量]

m(Na2CO3)=n(Na2CO3)·M(Na2CO3)=c(Na2CO3)·V[Na2CO3(aq)]·M(Na2CO3)=0.1 mol·L×0.5 L×106 g·mol=5.3 g [板书]配制步骤:1.计算

[设问]我们用什么仪器来取用5.3 g的Na2CO3呢? [学生回答]

[板书]仪器

1.天平(含滤纸)2.药匙

[设问]所需溶质的质量有了,那么,所需溶剂即水的量呢?我们能否算出它的质量或体积呢? [学生思考并讨论]

[教师]显然,我们根据题中条件无法算出水的量。即我们不能通过用一定量的水和Na2CO3混...合来配出所需的Na2CO3溶液。那么,是不是就没有其他办法了呢? [教师]展示500 mL的容量瓶

[教师]这种仪器可以帮助我们达到目的。请大家回忆实验基本操作中容量瓶的使用方法。[投影]容量瓶的使用

1.容量瓶的体积固定,有不同规格(100 mL、250 mL、500 mL、1000 mL等)。2.使用前须检验容量瓶是否漏水。

3.溶液温度与容量瓶上标定温度一致时,所取液体的体积最标准。

4.溶液液面接近刻度线1 cm~2 cm时,须用胶头滴管加水至刻度线。

[教师]下面,老师演示配制溶液的过程,大家请注意观察我所用到的仪器和操作步骤。[教师演示]

[教师和学生一同总结出以下的内容并板书] [板书]配制步骤

2.称量,3.溶解,4.移液,5.洗涤,6.定容,7.摇匀。

[仪器]3.容量瓶,4.烧杯,5.玻璃棒,6.胶头滴管。

[教师]在熟悉了配制步骤和所用仪器后,请大家思考回答下列问题。[投影]1.为什么要用蒸馏水洗涤烧杯内壁? -

1-12.为什么要将洗涤后的溶液注入到容量瓶中? 3.为什么不直接在容量瓶中溶解固体?(大多数物质溶解时都会伴随着吸热或放热过程的发生,引起温度升降,从而影响到溶液体积)4.转移溶液时,玻棒为何必须靠在容量瓶刻度线下? 5.为什么要轻轻振荡容量瓶,使容量瓶中的溶液充分混合? [过渡]以上我们分析了在配制过程中需注意的问题。若在配制操作中有以下行为,将会对配制结果造成什么样的影响呢? [投影]1.称量时,物体与砝码的位置颠倒。2.容量瓶内壁存有水珠。3.定容时仰视读数。

4.未用蒸馏水洗涤烧杯内壁。

5.溶质溶解后,没有恢复至室温转移。

6.用量筒量取液体时,俯视读数,使所读溶液体积偏小。7.天平的砝码沾有其他物质或已生锈。[总结]分析误差时,要根据c=

nV围绕操作行为对n与V的影响来分析。

-3[思考练习题]若用98%的浓H2SO4(ρ=1.84 g·cm)配制1000 mL物质的量浓度为0.1 mol· L-1的溶液,需怎样配制? [注意]①计算浓H2SO4的体积V ②浓H2SO4的正确稀释方法

③向容量瓶中转移溶液时,要待溶液冷却后再进行

[小结]配制一定物质的量浓度的溶液,最主要的仪器是容量瓶,其配制步骤与所需仪器与配制一定质量分数的溶液是不同的。

[板书设计]

四、配制一定物质的量浓度的溶液

配制步骤:1.计算,2.称量,3.溶解,4.移液,5.洗涤,6.定容,7.摇匀。

所用仪器:1.天平,2.滤纸,3.药匙,4.容量瓶,5.烧杯,6.玻璃棒,7.胶头滴管。

[教学说明]配制一定物质的量浓度的溶液,是高中阶段最重要的实验之一,除了要掌握正确的配制步骤及仪器的使用方法外,还要能准确地分析实验误差,以利于学生思维能力及分析问题能力的提高。

第二篇:四年级上科技活动教案册

1、一滴油的动力

教学目的:

1、通过本课的学习,使学生从小学科学爱科学。

2、知道一滴油的动力

3、培养对科学的兴趣。教学重点、难点:

1、知道一滴油的动力

2、培养对科学的兴趣。

一、导入:

小鱼的鳍动一动,水中身体游一游; 我的小鱼真奇妙,向前游泳鳍不动。噫。。这是为什么?秘密我来探一探。

二、准备好:

在纸上画一条像图中一样可爱的小小鱼,剪下来,然后在它的中间开一个圆洞。再剪开一条“水道”与鱼尾相通。

还需要准备下面这些材料:一盆水,油,滴油的工具。

三、动手做

把剪好的“小鱼”轻轻地放在水盆里,下面巾着水,保持上面干燥。然后小心地把一滴油滴在洞里。小鱼就开始向前进运动。

四、研究研究

“小鱼可以前进,它还可以后后退”各拐弯吗?重新设计作一些可以后退和拐弯的小鱼,试一试。

五、试一试,油通过在水面的扩散可以推动小鱼的运动,生活中还有其他的用品能产生同样的动力吗?用小鱼试试吧。

六、知道吗 这是为什么呢?

滴一滴油在水面油总四周扩散工艺。而小鱼里面的油只能沿着“水道”前外扩散。油比水轻,所以总是漂在水面,并破坏活动了水的表面膜张力,使小鱼运动。

一些洗涤用品亦可破坏水的表面张力,使小鱼运动。

七、比试比试

在没有风的日子里,约上几个好伙伴,我们一起来到池塘边:

1、观察一滴油能扩散成多大的面积?

2、举行一个游泳比赛,看看谁的小鱼游得最快。注意安全!板书: 一滴油的动力

油比水轻,所以总是漂在水面,并破坏活动了水的表面膜张力,使小鱼运动。、鸡蛋的沉与浮

活动目的:

1、通过本课的学习,使学生从小学科学爱科学。

2、知道鸡蛋为什么会沉与浮。

3、培养对科学的兴趣。教学重点、难点:

1、知道鸡蛋为什么会沉与浮

2、培养对科学的兴趣。

一、导入:

把一个生鸡蛋放在水中它是沉下去还是浮在水面上呢?如果鸡蛋下沉了,有办主它浮上来吗?

你想实验一下吗?

二、准备好

1个生鸡蛋,一个装水的杯子或瓶子,吕径比鸡蛋要稍大一些。一些食盐及 子,再准备一根筷子。

动手做

首先,在杯子里倒入水,将鸡蛋放入水中,观察允许角鸡蛋的沉浮。然后,用勺子往杯子中加放几勹食盐,再用筷子搅动,使食盐溶解,待水面静止后,观察鸡蛋 的位置是否变化。

如果把水中的鸡蛋 位置矢量没有变化莫测,可重复加盐,搅拌。你会发现,当盐加到一定量时,沉在水底的鸡蛋 会“晃晃悠悠”地信上浮,这是什么原因呢?

三、研究研究

1、在水中加入食盐,可以使鸡蛋 上浮。如果在水中加入白粮,味精,小苏打。。鸡蛋 能上浮吗?做实验研究一下。

2、上面的实验中,浮在水面上的鸡蛋,想让它再沉下去,你在办法吗?

3、你还能想办法使鸡蛋 像图中一样悬浮在水中央吗?

四、知道吗

鸡蛋 在清水中沉下去,说明鸡蛋 的重力大于水给它的浮力,在水中加入食盐后,盐水比清水产生的浮力大所心,当盐水达到一定浓度时浮力大于鸡蛋 的午力。就会把鸡蛋 托起来。

五、思考与实验

在亚洲西部有一个湖,很多生物无法生活在湖水中,人们叫它死海,人们还发现,人可以浮大死海的水面上,仰面看书也不会下沉。你知道这是怎么回事吗?

板书:

二、鸡蛋的沉与浮

鸡蛋 在清水中沉下去,说明鸡蛋 的重力大于水给它的浮力,在水中加入食盐后,盐水比清水产生的浮力大,当盐水达到一定浓度时浮力大于鸡蛋 的浮力。就会把鸡蛋 托起来。

3、你能吹起多重的物体

活动目标

1、通过本课的学习,使学生从小学科学爱科学。

2、知道自己能吹起多重的物体

3、培养对科学的兴趣。教学重点、难点:

1、知道自己能吹起多重的物体

2、培养对科学的兴趣。

一、导入:

液压千顶,用点小力气就能让它顶起几吨重的物体。为什么能有那么大的力气?

二、准备好

一个结实。没有损坏的塑料袋或大纸袋。一大摞厚厚的书,胶带,大头针。

三、动手做

首先,用胶带封住院部塑料袋的大部分开口,只留下一个小小的吹气口。然后把塑料袋放在平整的桌面上,在上面放上几本厚厚的书。接着,对着塑料袋的吹气口慢慢吹气。

观察允许角:你有什么发现?这是为什么呢?

四、研究研究

一、如果在塑料薄袋上扎个结果会怎样?

二、再换一个小的塑料袋做上面的实验,实验工厂能成功之路吗,为什么?

知道吗

五、为什么会有这种情况呢? 研究研究

聪明能干聪明能干说,如果用一个更大更结实 的袋子,他还能吹起超过20千克的物体。你变为他的话对吗?做实验工厂试试。

板书:

你能吹起多重的物体

4、奇异的悬浮

教学目标:

1、通过本课的学习,使学生从小学科学爱科学。

2、知道奇异的悬浮

3、培养对科学的兴趣。教学重点、难点:

1、知道奇异的悬浮

2、培养对科学的兴趣。

一、导入:

你知道磁悬浮列车吗?它可是现在世界上最新型,最高速,最环保的陆地交通工具嘴,它的最高时速可达五,六千米,而且是行驶噪声声低损耗量小。

二、磁悬浮列车为什么能悬而未决浮呢?我们用磁铁的实验来研究这个问题。

准备好

环形磁铁二个,能穿入环形磁铁的铅笔一枝,圆柱形磁铁二个,比圆柱形磁铁稍大的透明容器一个

三、动手做

将铅笔立起,套入一号环形磁铁,把二号环形磁铁同样 套入铅笔上。观察:发生了什么时候现象?

取出二号环形磁铁换另一面朝下套入铅笔。观察:各第一次实验现象相同吗?

四、研究研究

把三号,四号圆柱形磁铁像图中一样袋入透明容器做上面的实验,然后把上号的实验。然后把四号磁铁的上下面颠倒过来放进去,你发现了什么规律? 为什么会这样?你能解释原因吗?

五、知道吗

我们曾经研究过磁铁的性质,当两块磁铁的磁极相互接触式曝光法时。同极相互排斥,异极相互吸引。

环形磁铁和圆柱形磁铁的磁极都是在各、自的圆面上。当它们异极两面接近时互相吸引,而同极两面接近时互相排斥。实验工厂中的二号,四号磁铁则是受到排斥力,导到它悬浮起来。

板书: 奇异的悬浮 磁悬浮

5、豆子与车轮

教学目标:

1、通过本课的学习,使学生从小学科学爱科学。

2、知道豆子与车轮的关系

3、培养对科学的兴趣。教学重点、难点:

1、知道豆子与车轮的关系

2、培养对科学的兴趣。

一、导入:

汽车袋有圆圆的车轮,自行车装有圆圆的车轮,各种推车也装有圆圆的车轮。。。这其中有什么科学道理吗?

二、准备好

豆子少许,厚书一本,小篮子一个绳子一个绳子一根。捡一些小石子当作重物。实验场地:平整的桌面。

三、动手做

首先,把豆子撒在平整的桌面上。

然后,用绳子系住厚书,在绳子的另一端系上小篮子,再轻轻地把书放在豆子上。

接着,往来帐目篮子里一颗一颗粒肥料地加放小石子,观察厚书有什么时候现象学发生。

四、研究研究

一,拿走所有的豆子,将厚书直接放在书面上再做一次实验工厂,观察结果期有什么不同?

知道吗

当厚书放在撒上豆子的桌面后,篮子里用不着放很多石子,桌上里用不放很多石子,桌上的厚书就被牵动了,拿掉豆子后,虽然 篮子的感情用事加到很多,也不一定能牵动厚书。

这是为什么?各种前进的交通工具装腔作势有能滚动的车轮,就像实验中的豆子一样,在运动中减小了摩擦力,使它们运动起来更快更省力。

五、思考与实验

生活中还有哪些地方使用了轮子?它们都是用来减小摩擦力的吗?

板书: 豆子与车轮

6、口吹式滑翔飞机

教学目标:

1、通过本课的学习,使学生从小学科学爱科学。

2、知道做口吹式滑翔飞机

3、培养对科学的兴趣。教学重点、难点:

1、知道做口吹式滑翔飞机

2、培养对科学的兴趣。

一、导入:

你看过滑翔机表演区吗?飞机在空中平稳地滑过,姿态真是优美极了,很让人羡慕。你想拥有一架这样的飞机吗?我们不妨自己动手做一架。

准备好

大小不同的吸管各一根“要注细吸管能轻松插进粗吸管而滑卡住院部的现象学”。吹塑料管或薄卡纸一张,橡皮泥,胶带纸少许。

动手做

一,做机身,将大孔径的管一端用橡皮泥堵截信。。不能有渥缝。作为机身。把小孔么的吸管插进大吸管内。用嘴咬住院部着细吸管用力吹一口气,粗吸管便能向前飞去。

二,做机翅

机翅的开关主可以用自行创造设计,也可以参考图一中几种机翅的形式。将图中机翅和尾翅按所示尺寸或放大后画在吹塑纸上,剪切角下来。三安装。用胶带纸将做机身的吸管粘在机翅中心线上。尾翅粘于机身后端。一架滑翔机就做好了。

试一试

把细吸管插进机身内,朝细吸管内用力吹一口气,飞机会向前飞去吗?怎样才能使飞机更平衡地滑翔。?

比一比

况远,在同一起点线,用嘴吹气使飞机向前飞行,看谁的飞机飞得最远。定向,在不远处竖两根竹竿,如同门框,让你的飞机穿“门”而过。

定点:

在地面画个贺圈,使飞机准确无误确落在其中。板书:

口吹式滑翔飞机

用嘴吹气使飞机向前飞行,看谁的飞机飞得最远。

7、手摇缆车

教学目标:

1、通过学习本课,教会学生做手摇缆车。

2、培养学生的动手能力和想象力;使他们从小养成学科学爱科学的兴趣。教学重点、难点:

教会学生做手摇缆车。培养学生的动手能力和想象力;使他们从小养成学科学爱科学的兴趣。

一、导入新课:

同学们,你们坐过缆车吗?有的同学一定还记得小车厢悬在空中晃悠晃悠的乐趣吧?现在就让我们自己动手制作一个缆车来玩一玩,怎么样?

二、新授:

1、准备好

泡沫塑料一块,双层瓦楞纸,细铁丝,粗铁丝,彩色水笔,小刀,钳子,长30厘米的小圆木棍和长4厘米的小圆木棍一根,胶水等。

三、动手做:

1、做缆车,2、做缆绳

3、做支架,四、试一试:

五、板书:

八、捕蝇器

教学目标:

1、通过学习本课,教会学生做捕蝇器。

2、培养学生的动手能力和想象力;使他们从小养成学科学爱科学的兴趣。教学重点、难点:

教会学生做捕蝇器。培养学生的动手能力和想象力;使他们从小养成学科学爱科学的兴趣。

一、导入新课:

夏日炎炎,惹人生厌的苍蝇又出来 烦人了,要抓信它还真不容易。聪明的小朋友们,你能不能做一个捕蝇器,让苍蝇自投罗网呢?

二、新授:

1、准备好:

卡纸,透明塑料袋,透明胶带,胶水,细棉线,易拉罐。

三、动手做:

1、裁一块扇形的卡纸。将纸卷成,一只大漏斗,用胶水粘信接口处,做成一个引导苍蝇进去的“导蝇漏斗”。

2、把导蝇漏斗倒扣,在其大口边缘套上一只透明的塑料袋,袋口朝漏斗口里面折好,然后用透明胶带粘牢。

3、取一个易拉罐,剪去上半部分,把它的下半部分做成一个诱铒盆。在诱铒盒和导蝇漏斗上各打三个小孔,将它们用棉线连起来。

4、将一根棉线的两头分别 粘在塑料袋的底部两边,做成一个挂架,这样,捕蝇器就可以挂起来了。

四、试一试,把做好的捕蝇器挂职在窗户边,在诱铒中放些香甜的食物。当蝇在叮咬食物时,一不小心就会通过漏斗的“引导”飞进塑料袋中。

五、想一想

你能想办法把捕蝇器中的苍蝇方便地取出来吗?

六、板书:

9、“取不尽”的纸带

教学目标:

1、通过学习本课,教会学生做“取不尽”的纸带。

2、培养学生的动手能力和想象力;使他们从小养成学科学爱科学的兴趣。教学重点、难点:

教会学生做“取不尽”的纸带。培养学生的动手能力和想象力;使他们从小养成学科学爱科学的兴趣。

一、导入新课:

理发店门前那漂亮的圆面积筒可引人注目了,你看,它身着彩色条纹的花衣不停地旋转着,最神奇的是它由三色纸带做成的“衣服”,随着身体的旋转的身体不停上升,直到头顶消失,而从肢下又会不停地抽出纸带来,真像变魔术似的,纸带总也取不尽!

这到底是怎么回事呢?跟我来做一个实验吧,到时你就明白是一回什么事了!

二、准备好

钳子,剪刀,圆柱形可乐瓶,彩色挂职历纸,铁丝,空圆珠笔心等。

三、动手做

1、取宽六十毫米的彩色挂职历纸条,折成宽约五毫米的波纹状。

2、沿波纹状纸条的中心线纵向穿一根细铁丝。

3、将波纹状纸条的一端粘上一段铁丝作为下端,另一端挂在用铁丝做的轴架上。

4、取一个圆柱形可乐瓶,剪去上面的锥形部分,并在瓶底中心部位开个小孔。

5、将穿在波纹纸条轴架上的铁丝从瓶底穿出,然后套上一截圆珠笔心,再弯成一个摇柄。

四、试一试

如果转动摇柄,你会看到与理发店门前旋转着的圆筒类似的情景。朝不同的方向转动摇柄,看到的现象学会相同吗?

五、板书:

10、激光

教学目标:

1、通过学习本课,使学生懂得激光的特点;以及人类利用激光,让它在日常生活为人类造福。

2、培养学生的动手能力和想象力;使他们从小养成学科学爱科学的兴趣。教学重点、难点:

使学生懂得激光的特点,培养学生的动手能力和想象力;使他们从小养成学科学爱科学的兴趣。

一、导入新课:

激光不是一种天然光源,与们日常见到的灯光,太阳能光相比,激光有许多特殊的性质,它着色单一,方向性好,亮度很高。。1960年,美国研制出了世界上第一台激光器,现在,激光技术在许多领域得到了应用。

二、知道吗

激光具有单色性。也就是说激光只有一种着色,激光可以射到很远的地方,激光可以在很短的时间里,把很大的能量动量张量集中在很小的面积上,具有很高的亮度。

三、怎么样

让学生了解激光在人们日常生活中的作用。

1、激光育种。

2、激光测距。

3、激光读光盘。

4、激光手术。

四、做一做

找一个微型激光器,一个手电筒,比较两种光的特点。注意:微型激光器发出的激光虽然比较微弱,但如果把照射到人的眼睛上,会对眼睛造成伤害,严重的可以使眼睛失明。一定记住,不要对人的眼睛照!!)

五、板书:

激光不是一种天然光源 着色单一,方向性好,亮度很高

11、新型发电厂

教学目标:

1、通过学习本课,让学生懂得只有努力学习,将来在开发利用新能源方面不断取得成功,为人类造福。

2、培养学生的动手能力和想象力;使他们从小养成学科学爱科学的兴趣。教学重点、难点:

让学生懂得人类现在利用大地上的能源,取得了哪些成功。使他们从小养成学科学爱科学的兴趣。

一、导入新课:

人类在利用煤,河流的水力发电的同时,也为利用这两种能源带来的缺点而烦恼。人们在不断地努力寻找更科学的发电方法,更合适的能源,随着科学技术的发展,人们在开发利用新能源方面不断取得了成功。

二、知道吗

我们地球上有着丰富除子的能源库,比如辽阔的海洋,就是最大功率传输定理的能源库之一,波涛汹涌澎湃的海浪,一涨一落的潮汐循环不息的海流。。。都不得是宝贵的能源。再比如核能,一千克铀全部裂变时,放出的能量超过2000吨优质煤完全烯烧释放的能量。

看一看:

1、海洋发电

海洋能是无污染的清洁资源,是取之不尽,用之不歆的财富。(1)(2)(3)潮汐能发电 海浪发电 海流发电

2、核电站

3、垃圾电站 板书:

十二、新型发电厂 潮汐能发电 海浪发电 海流发电 核电站 垃圾电站

12、善于联想

教学目标:

1、通过学习本课,让学生懂得只有努力学习,平时注意观察周围环境,留心身边的小事物,开动脑筋善于联想,也能为人类造福。

2、培养学生的动手能力和想象力;使他们从小养成学科学爱科学的兴趣。教学重点、难点:

让学生懂得只有努力学习,平时注意观察周围环境,留心身边的小事物,开动脑筋善于联想,也能为人类造福。

一、导入新课:

“联想”就是在脑海里从一件事情或者一件物品出发,想到另一件事情或者另一件物品的思维过程。善于联想可以帮助我们进明创造。

二、看一看

1、从普通信箱联想到留言信箱。

2、从普通的楼梯联想到储物楼梯。

如:一个小朋友看到小狗爬楼梯,联想输入到“如果小推车”也能爬楼梯该多好啊,经过不断地思考,他发明了一种能爬楼梯的小推车。

世界上的许多事物都是互相联系的,只要善于掌握事物 之间的共同之处和彼此之间的联系,由此及彼地产生联想,就能找出解决问题的办法。

三、想一想

你知道图上的抓物器是从什么物品中产生联想而制作出来 的吗?? 板书:

十三、善于联想

“联想”就是在脑海里从一件事情或者一件物品出发,想到另一件事情或者另一件物品的思维过程。善于联想可以帮助我们进明创造。

14、为了需要

教学目标:

1、通过学习本课,让学生懂得只有努力学习,平时注意观察周围环境,留心身边的小事物,开动脑筋善于联想,为了需要也能为发明创造。

2、培养学生的动手能力和想象力;使他们从小养成学科学爱科学的兴趣。教学重点、难点:

让学生懂得只有努力学习,平时注意观察周围环境,留心身边的小事物,开动脑筋善于联想,为了需要也能为发明创造,也能为人类造福。

一、导入新课:

在发明创造中有一句十分重要,百分正确,千分要牢记的话,那就是“需要是发明创造之母”。母,是个借用词,意思是“需要”孕育着发明,“需要”萌发出发明,“需要”滋养发明。

人类想有个舒适的环境,夏天不热,冬天不冷,因此发明了电风扇,取暖器,冷暖空调。

二、看一看

上海时代中学的一位同学把一种知能自控加热限温电缆用到她发明的干鞋钩里,这样就保持了鞋内的干燥并除去了鞋内产生的异味。

三、给墨水瓶安个家

在课桌的两边装上两个矩形小箱子,墨水瓶放在里面,可防止墨水瓶被打翻,保持课桌清洁。

四、在拥挤的公交车上,要是没有足够的扶手,怎么办呢?谁来想一想办法?

五、做一做

小同学因为个子矮,擦黑板时总擦不到上方,要跳起来才能把黑板擦干净,请你发明一种上下都能擦到的黑板擦。

六、想一想

留心观察你周围的生活和学习用品,你可以提出一些什么小发明设想?

板书:

十四、为了需要

“需要是发明创造之母”

小发明设想

十五、快乐的小兔

教学目标:

1、通过本课的学习,使学生从小学科学爱科学。

2、知道做手工快乐的小兔子

3、培养对科学的兴趣。教学重点、难点:

1、知道做手工快乐的小兔子

2、培养对科学的兴趣。

一、导入:

蹦蹦跳跳的小兔,那活泼可爱的样子,非常惹人喜爱。下面的活动,移位取代将制作一只快乐的小兔子。

二、准备好

卡纸。20厘米长的铁丝一根,胶水,美工刀等,三、动手做

一,按图一尺寸在卡纸板上画出盒子的展开图剪下。

二,沿虚线用美工刀轻轻刻出刀痕(注意不要划断了。)然后 按要求将它贴合成长方体小合,两边先不要封死,以便于工作安装由轴等内部结构。

一,照图三在卡纸上画出小兔。并沿轮廓线将下端两边分别向内折成直角。

二,四将铁丝照明负荷图四所示弯成由轴。

三,照明负荷图五将曲轴先穿过小兔下端两边的小孔洞,再穿过小合两个边孔,最后把小合两边粘住。

试一试

摇动物柄,小兔会随着手柄摇动的节奏又蹦又跳。再为它配上一支欢快的曲子就更热闹了

第三篇:新人教语文七上名著复习

初一上名著阅读阅读自测及答案

一、《繁星》《春水》

2、《繁星》、3、总的说来,《繁星》、大自然的崇拜和赞颂。三是对人生的思考和感悟。

4、诗集《繁星》、《春水》是人们公认的小诗最高成就,被茅盾称为、“春水体”。

5明艳;然而当初她的芽儿,浸透了奋斗的泪泉!洒遍了牺牲的血雨”。

6、“墙角的花,你孤芳自赏时。天地便小了。”这一小诗富有意蕴,请你仿造一句同样富有哲理的句子。溪中的水,你停滞不前时,生命就完了。

7、请你赏析书中你特别喜欢的名句

二《伊索寓言》

1.2.或为主人公。动物寓言部分广泛采用拟人手法,表现了动物各自的习性。诸如豺狼的凶残,狐狸的__狡猾__,狮子的威猛,山羊的__怯懦___,都刻画得栩栩如生,给人留下深刻的印象。

3.融思想性和艺术性于一体。

4.你课外已经读过伊索寓言了,请你说说下列寓言的主要寓意:

(1)、《狼和小羊》《猫和鸡》就以绝妙的讽刺笔法,揭露了当时统治者的残暴和蛮横;

(2)、《农夫和蛇》的故事就告诫人们,_对恶人千万不能心慈手软_。

(3)、《狐狸和山羊》写的是掉在井里的狐狸哄骗山羊下井,然后踩着山羊背跳出井底,却扔下山羊不管的故事,警示人们____做好事也要看对象,以免上当受骗_____。

(4)、《乌龟与老鹰》通过乌龟非要学飞翔不可,结果摔死的悲剧,说明____任何事物都有自己的规律性,不可违背规律____。

(5)、《蚯蚓与狐狸》《鼹鼠》嘲笑____吹牛说大话____,(6)、《骆驼与宙斯》批评___贪得无厌____。

5.《伊索寓言》往往简洁客观地叙述一个故事,最后以一句话画龙点睛的揭示。

6.说说你从书中看到的印象最深的一个故事的内容和寓意

第四篇:新人教(七下)2009-2010

2009-2010七年级数学下学期第一次月考试题答案

一、1.C2.C3.C4.C5.C ;6.A7.C8.A9.C10.C

二、11.80°锐角12.2013.70°14.(7,4)15.105°

16.略17.19.略°

三、21.略

四、22.两直线平行,同位角相等∠3DG内错角相等,两直线平行∠DGA或∠AGD两直线平行,同旁内角互补110°

26.证明:∵AD//BC

∴∠B=∠EAD(两直线平行,同位角相等)

∠C=∠DAC(两直线平行,内错角相等)

又∵∠ABC=∠C(已知)

∴∠EAD=∠DAC(等量代换)

∴AD平分∠EAC

27.解:∵AB//CD∠1=45°

∴∠D=∠1=45°(两直线平行,同位角相等)

∠C+∠B=180°(两直线平行,同旁内角互补)

又∵∠D=∠C(已知)

∴∠C=45°∠B=180°-∠C=135°

28.解:AE//DC(3分)

证明:∵AB//DE

∴∠1=∠AED(两直线平行,内错角相等)

又∵∠1=∠2(已知)∴∠AED=∠2(等量代换)

∴AE//DC(内错角相等,两直线平行)

第五篇:最新人教新目标8上英语作文

Unit 1

My Vacation to Beijing Wednesday, August 20th Today the weather was hot and sunny.I went to Beijing with my parents.Idid a lots of things there.We visited the Palace Museum and the Great Wall.We also went to Tianan’men Square.There were many people there.Then we went to a Beijing Hutong.It was beautiful.We took some photos.I liked this place because it was interesting.For dinner we had Beijing duck.It was delicious.In the evening, I felt really tired but very happy..1.假如你是林涛,去年夏天去北京度假,参观过许多地方。以My vacation 为题目,写一篇70词左右的短文。内容包括:1,旅游景点(the Great Wall, the Palace Museum, Tian'anmen Square, Beijing hutong).2, 天气、活动。3,观点等。

Last summer, I went to Beijing on vacation with my father.The weather was sunny and hot.First we visited the Great Wall.There were a lot of people on the Great Wall.It is really the longest wall in the world.The next day, we visited the Palace Museum and Tian'anmen Square.We took many photos there.We also visited some other interesting places in Beijing.We visited a Beijing hutong, too.We had a great time there.I hope to go there again.Unit 2 根据调查结果写一篇短文

Activities

Here are the results of the students' activity survey in my class.Everybody takes their exercise for an hour every day.90% of the students eat fruit and drink milk every day.7% of the students eat junk food for 2 or 3 times a week.Nobody drinks coffee.Most students sleep for 8 or 9 hours a day.Unit 3 你和你朋友在外貌和性格方面有什么异同呢?请以“My best friend and I”为题,运用比较级写一篇英语文章.Should friends be the same or different? For me ,It’s not necessary to be the same.My name is David.My best friend Jeff is quiet different from me.He is shorter and quieter than me.We both like sports ,but he plays baseball better than me ,so he always wins.Jeff works harder and always get good grades.We can talk and share everything.I think my best friend helps to bring out the best in me.We’ll be good friends for ever.关于朋友的短文可以提及:名字、外貌、他喜欢做什么、与你有哪些相同和不同,最好加一些对朋友的看法.My best friend and I Every one needs friends, so do I.I have many friends, but Mary is my best friend.Let me tell you something about her.She is 14 years old.She is tall and thin.She has two big eyes.She is smart.And she is very funny.she likes telling jokes, and she often makes me laugh.We have many things in common.We are both outgoing in our class.We both like sports and math.And we both enjoy playing computer games.However, we also have some differences.She is good at playing tennis, so she always wins in tennis.I am smarter than her, so I always get better grades than her.I think friends are like books, you don’t need a lot of them as long as they are good.So I hope we can be friends forever.请以“My best friend”为题写一篇介绍你的朋友的短文。短文要运用课文所学的有关句式,把你的朋友和你的长相(包括身高、头发、眼睛等)、体格(包括强壮强度等)、性格(开朗、文静等)、学习情况等方面进行比较。词数70左右。

My best friend My best friend is Li Ming.We are in the same class..He is as old as me, but he is taller and stronger than me.Both of us have black eyes and black hair, but his hair is shorter than mine.Li Ming likes sports.He often exercises after school.He is more outgoing and more athletic than me.But I think I’m smarter than him.Most of my subjects are better than his.Unit 4 上周,我们举办了一次“我们城市的一些好场所”的问卷调查,请根据下面的表格所提供的信息写一篇调查报告,不少于80词。

A survey of good places in our city Last week we did a survey about good places in our city.And this is what we learned.Most of the high schools are good, and the No.10 High School is the best in our city.It has the best teachers and it's the most beautiful.People's Hospital is the best of all.It has the most comfortable beds and the friendliest service.Modern Cinema is the best.It has the biggest screens.The best clothing store in our city is Xiwang Clothing Store.It has the best quality and it's the most popular.As for radio station, most young people think Hefei 168 FM is the best radio station.It has the latest news and the most interesting music.Unit 5 请根据下列表格内容写一篇他们各自的爱好情况字数在60词左右.Today ,I asked my family about movies.Some of their answers are very interesting.Here are their likes and dislikes.My sister likes cartoons very much, but she can’t stand action movies.My mother can’t stand action movies, either.She likes comedies.My father dislikes sitcoms ,but he likes action movies.My brother likes action movies ,too.He can’t stand cartoons.Unit 6.新学期要到了,写一篇关于学期的计划,讲述一下自己打算在新的学期要做些什么?提示:可以写自己在学习,健身,娱乐,培养业余爱好等方面的计划或打算.New Year’s Resolutions New year is coming.I’m going to do a lot of things next year.First, I want to improve my Chinese, so I’m going to practice it very often and have many conversations with my friends.Next, I want to be healthier, so I’m going to do sports every day such as swimming, running and so on.At the same time, I’m going to eat less junk food.Finally, I want to join the dancing club, so I’m going to practice dancing twice a week.I hope my resolutions can come true in the coming year.本学期计划打算

This term I should study harder.I am good at math, physics and science.However, my English is not good.So on the one hand, I think I should ask the teacher for help.On the other hand, I will learn from my good friend.His English is good.Maybe he would like to help me.My teacher said my compositions were not good.So I should read more useful books after class.I believe I will do well in English.On the other way, I should take more exercise, this will make me strong and healthy.I like playing ball games.After class I should make more friends, because the more we are together, the happier we will be My New Year’s Resolutions

Here are my plans for the new school year.I’m going to study harder to get better grades and make more friends.I’m going to improve my English.To keep healthy, I’m going to eat healthy food and get lots of exercise.I’m going to eat more vegetables and fruit and have less junk food.Also, I like playing the guitar, so I’m going to take my guitar lessons every weekend.寒假即将来临,请根据一下提示写一篇短文,谈谈你的寒假计划。

1、好好休息和放松;

2、读书,因为读书既能开阔视野,还能学到很多知识;

3、陪父母聊天,帮他们做家务;

4、参加社会活动,认识更多的人。要求:

1、词数:80词左右

2、可围绕主题适当发挥 参考词汇:knowledge 知识; social activities 社会活动 范文: The winter holiday is coming.I’m going to do what I want to do.First, I’m going to have a good rest and relaxation.I will read some good books.Reading books is useful because it can not only open up my mind but also help me get more knowledge.Next, I’m going to spend more time talking with my parents.I will also try my best to help them do some housework.Then, I’m going to take part in social activities so that I can get to know more people.What do you think of my holiday plan? I hope you will have a happy winter holiday.My life in ten years In ten years, I think I'll be a reporter.As a reporter, I think I'll meet lots of interesting people.And I will also travel all over the world.I'll live in Beijing because I went there last year and fell in love with it.And I will keep a pet pig, because I like it very much.I will live in an apartment with my parents.This is my life in ten years, I think I will be very happy in the future.七、请以“未来的学校生活”为主题,写一篇英语短文。要求:灵活运用一般将来时。

School life in the future I think school life in the future will be more colorful and interesting.We students will have classes only in the morning.We won’t have homework after school.We will have more free time to take part in all kinds of(各种各样的)activities in the afternoon.For example, we will play sports, visit the museums and go to the movies.If we are ill, we will study at home.We will listen to the teacher on the Internet.My hometown in 20 years I think my hometown will be very different in 20 years.My hometown will be cleaner and more beautiful.There will be less pollution and we will see the blue sky.The water will be cleaner and the air will be fresher.There will be more people.People will be richer and happier.I love my hometown.I hope it will become more and more beautiful.What will our life be like in the future? I think our life in the future will be better and better.There will be more tall buildings and most people will live in big houses.There will be fewer cars and more buses.There will be more trees and less pollution in the future.As for education, I think there will be fewer schools in the future.Most students will study at home on computers.How wonderful the life in the future will be!My future Everyone dreams about the future.I also have a dream about my life in 20 years.I will live in Shanghai with my families because we like it very much.It will be more beautiful.I will teach in a middle school.I will be a good English teacher.I will love my students, and my students will love me, too.We will be good friends.As a teacher, I will get on well with my students.I will do sports with my students every day.Swimming and running will be my favorite sports.I will be healthy and strong.There will be more robots everywhere.They will help us do many things.I believe we will have more time to study and play.This is my future dream.I ‘m sure I will have a more wonderful life in 20 years.I will work hard to make my dream come true.What do you think of it? 2.每个人对未来都充满憧憬,请谈谈你心目中未来的理想工作,以

“My Dream Job”为题

1.What is your dream job? 2.Where would you like to work? 3.Why do you like your dream job? 4.How are you going to work?

My dream job Everybody has a dream job.Do you want to know what I want to be in the future? Well, I’m going to be an English teacher when I grow up.My English was not good.Sometimes my classmates laughed at me.My English teacher Mrs.Wang helped me a lot.I want to be a teacher like her.I’m going to study education and learn how to teach children.I’m going to start when I finish high school and college.I think Chengdu is where I want to work,so I’ll work in Chengdu when I grow up.I hope my dream will come true one day.And What’s your dream job?

My dream job”为题,写一篇80词左右的短文,介绍自己对未来理想职业的打 算

My Dream Job

Everybody has a dream job.Do you want to know what I want to be in the future? Well,I want to be a singer.Because I love singing very much.And I think that I can sing on the stage(舞台).I will move to New York and be a singer there。And I will sing my favorite English songs there.Although it is a tiring job, I love it.Because when I am sad, I can sing songs to be happy and I will become very popular.That’s so interesting and exciting.For my dream job, I will sing every day and sing well.I hope that day come soon , I can’t wait!How about you? What’s your dream job?

I have a dream, my dream is to be an English teacher.The reason for this is that I like English, and also I like my English teacher very much, so I want to be an English teacher like him.I will love my job, and love each of my students.I will teach my students very well, and tell them many interesting stories and teach them to learn beautiful English songs.In order to achieve my dream, I think I should start from now on.First of all, I should learn hard, not only English, but also other subjects.I need to go to college to get a good education.Next, I should learn how to communicate and get along well with other people, especially children.Then, I will watch and learn my teachers' teaching ways and skills.I hope my dream will come true.示以My Dream Job为题写一篇短文(unit 6)提示:(1)想成为一名记者(2)打算给报纸写文章(3)高中以后想去北京上大学(4)想在一家电台工作并环游世界

When I grow up, I'm going to be a journalist.Next year, I'm going to write articles for magazines and newspapers.I'm going to a university in Beijing after high school.Maybe I'm going to find a part-time job and save some money.Next, I’m going to work for a TV station as a journalist.Then I am going to travel all over the world.Unit 8 你知道感恩节这天,人们会吃什么吗?请根据本单元知识叙述一下这种食物的制作过程.How to make turkey Here is one way to make turkey for a Thanksgiving dinner.First, mix together some bread pieces, onions, salt and pepper.Next, fill the turkey with this bread mix.Then, put the turkey in a hot oven and cook it for a few hours.When it is ready, place the turkey on a large plate and cover it with gravy.Finally, cut the turkey into thin pieces and eat the meat with vegetables like carrots and potatoes.Do you know how to make a beef sandwich? Now, let me tell you.First, put a spoon of cheese on a piece of bread.Next, cut up a green pepper and an onion.Add these to the bread.Then, put some mushroom and 2 pieces of beef on the bread.Finally Put another piece of bread on the top.Now you can enjoy it.It’s very delicious.九、你写一篇制作爆米花(popcorn)的小短文。注意使用first,next,then, finally等表示过程的词

How to make popcorn I like popcorn very much.I learned from my mother how to make popcorn.Now let me show you the ways.First you put the popcorn into the popcorn machine.Next, turn on the machine.Wait for several minutes.Then pour the popcorn into the bowl.And put some salt on the popcorn.Finally you can eat the popcorn.Unit 9 假如你的好友邀请你去参加生日聚会,但因为你下周的日程已经排满,不能前往。请根据提示给她回信婉言谢绝,并表达你的谢意。Hi Ann, Thank you for your invitation.I am sorry I can't come to your birthday party this week.I am really busy.On Monday, I am going to the movies with my friends.On Tuesday, I am going to visit my aunt.On Wednesday, I have to help my mother.On Thursday, I am going to my sister's birthday party.On Friday, I am going to Ning Bo on vacation with my parents.I have bought a nice gift for you.I hope you will like it.I hope you will have a good time.yours Candy

根据提示写一封60-80字的信。Tom 邀请Li Ping 参加他这周日的生日宴会,但Li Ping的父母出差要到下个月回来,奶奶又卧病在床,需要人照顾。再说英语考试即将来临,因此,无法前去参加生日宴会。Li Ping感到很抱歉,只好写信辞谢。Dear Tom, Thank you very much for inviting me to your birthday party.I'd love to go but I can't..My parents are out on business.They are coming back next month.And now I have to look after my grandma because she is ill in bed.And I also need to study for my coming English exam.I'm very sorry but I can't go to your party.Thank you for asking me.I hope you can have a good time.Li Ping Hi Henry, Thanks for inviting me to go climbing next week.I’m sorry, I ‘m not available.I have a really busy week.Today I am going shopping in the supermarket, and tomorrow I will go to Mary’s birthday party.On Tuesday I’ll go to the doctor.On Wednesday I am going to play with the school team and I will have a science test on Thursday.I will go to the movies with some friends on Friday.On Saturday I will have to do some washing.Oh, it is late.I must stop now.I hope you will have a good time.Write back soon.Yours, Kate

Unit 10 你以后可能会有很多钱,想一想,如果你有了钱,你会用它做什么?以If I have a lot of money为题写一篇60词左右的短文.If I have a lot of money If have a lot of money, I'll travel round the world and I'll stay at the best hotels.If I have a lot of money , I will buy a big house with a beautiful garden for my parents , I want them to live a happy life.Also, I will buy a sports car for my father and give my mother many fashion clothes.If I have a lot of money , I will give some money to charities and help the poor students.So they can go to school and get a good education again.I am sure, one day, my dream will come true.If I have a lot of money If I have a lot of money, I will have the chance to do what I want to do.It is best to do good things with the money.So I think I’ll give some money to charities to help the people in need.I’ll try my best to help people who are in trouble.Then, I will buy a big house with a garden and a swimming pool for my parents, so they will live a happy life.I’m sure I will enjoy a better life.If I have a lot of money If I have a lot of money, I will do something important.My dream will come true.Of course, I can do a lot with the money.I’ll help the old and the poor.Besides, I’ll give money to the charities or schools and help those poor children who can’t go to school.I hope they will change their lives in the future with the knowledge.At the same time, I think I’ll buy a big house for my parents, and help them enjoy their lives.In a word, I can do a lot of wonderful things and make contribution to our country.I will try my best to make my dream come true.If I am a teacher

I want to be a teacher when I grow up.If I become a teacher, I'll try my best to teach my students well In class, I'll be strict with them.After class, I'll play with them.If they are in need, I'll help them.I'm sure I'll be a good friend of them and a good teacher.I hope I'll be a teacher when I grow up.I believe there is nothing difficult in the world if you put your heart into it.Do you believe me

If I am a teacher, I will be very happy.I like students and the job.In class, I’ll discuss some questions with the students.I’ll be glad to help them.I’ll encourage them to take part in every activity.I think each of them is a good student and I also believe them.After class, we’ll play sports together, have interest groups, talk about the interesting topics, and we’ll have a picnic on weekends.I think we’ll have a great time and the students will grow up healthily.How to keep healthy If we want to keep healthy, we must have a good habit.We should get up and go to bed early and sleep at least eight hours every day.Do more exercise, such as walking, swimming, playing balls and so on.We should also eat healthy food—more fruit and vegetables and less meat.If you don’t feel well, you’d better see a doctor at once.And we should wash our hands before meals and drink enough boiled water every day.It’s necessary for our health.We should not throw litter about or smoke.It’s also very important.从饮食,睡眠和运动几方面谈谈怎样可以保持身体健康。

Health is one of the most important things for us.Without a good health, we can’t do anything.So we all want to keep healthy.But how? If you want to be healthy, you must have a good diet.You shouldn’t have too much hot or sweet food with much fat.They are all bad for your health.Instead, you should have vegetables and fruit to keep yourself healthy.You should also sleep well.A student should sleep at least 8 hours a day.Besides, it is necessary to take more exercise , too.You should take more exercise to make yourself stronger and healthier.Since health is so important, we should try our best to keep healthy.四、我最会喜欢的电视节目:写出节目名、叙述内容以及喜欢的原因

My favorite TV show My favorite TV show is China’s Got Talent.The talent show tries to look for the best singers, the most exciting magicians, the funniest actors and so on.All kinds of people join the show to show their talents.Some people are truly talented.When you watch the shows, you can play a role in deciding the winner.The winner usually gets a good prize.I like it because it gives people a way to make their dreams come true.五、影评:需注意时态;介绍电影类型、主人公、故事大意、以及个人看法。The Lion King The Lion King is a great movie.I like it very much.It’s a cartoon.It ‘s a story of Simba.Simba’s father was the king.But his uncle Scar killed his father.When Simba grew up, he came back to the forest and became the true king of the forest.Simba is hard-working, and he has many good friends.He is also kind so he can becomes the true king.I think it is fantastic.And if you plan to watch a movie, choose The Lion King.

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