沪教版（三起）四年级下册Module 3 My colourful life-7 My day-ppt课件-(含教案+视频+音频)-公开课-(编号：30642).zip

小苏打和白醋的变化小苏打和白醋的变化 教科版科学六年级下册 第二单元 第四节之 【教学目标】 科学概念： 小苏打和白醋会发生化学反应，产生新的物质。 二氧化碳是具有特殊性质的一种气体。 过程与方法： 通过观察、实验、分析和阅读资料得出正确结论。 情感态度价值观： 懂得只有足够的证据才能做出正确的判断，得出科学结论需要严密的 逻辑推理。 【教学重点】1.小苏打和白醋混合时现象的观察、描述。 2.新产生气体特征的判断。 【教学难点】新产生气体特点的检验方法。 小苏打和白醋的混合属于物理变化还是化学变化小苏打和白醋的混合属于物理变化还是化学变化 观察小苏打和白醋观察小苏打和白醋观察小苏打和白醋观察小苏打和白醋 小苏打和白醋混合后的变化小苏打和白醋混合后的变化小苏打和白醋混合后的变化小苏打和白醋混合后的变化 产生了什么气体产生了什么气体产生了什么气体产生了什么气体 消毒杀菌 一、观察小苏打和白醋 声音：嘶嘶声 颜色：无变化（杯底白色粉末 ，透明液体） 现象：产生气泡，气泡多而快 温度：杯外壁降温变冷了 实验实验实验实验 实验实验实验实验 2 总结一下总结一下 气体的特性： 1、比空气重（不易向上扩散，能向下倾倒 ） 2、阻燃烧 符合这两个条件的气体有 ：二氧化碳，氩，氙. 二氧化碳的固态颗粒可以作为舞台烟雾和人工降雨 资料库中资料库中资料库中资料库中43434343页页页页 留下的液体是醋酸钠的新物质留下的液体是醋酸钠的新物质留下的液体是醋酸钠的新物质留下的液体是醋酸钠的新物质 观察、对照实验前的小苏打，白醋，激发兴观察、对照实验前的小苏打，白醋，激发兴 趣课外探究。趣课外探究。 复分解反应 发生在溶液中，是由两种化合物互相交换成分，生成另外两 种化合物的反应。 简记为 ： 由于醋酸钠溶液是混合物，故没有化学式，不过其主要有效成分是CH3COONa （NaHCONaHCO 3 3 ）+ +（CHCH 3 3 COOHCOOH）=CH=CH 3 3 COONa + HCOONa + H 2 2 O + COO + CO 2 2 小苏打小苏打 白醋白醋 （醋酸钠）（醋酸钠） 例： NaOH + HCl = NaCl + H2O 小苏打和白醋反应的应用 用醋洗头在近年来还有一个升 级版本，那就是“小苏打+醋 用小苏打+白醋洗发效果惊 人！ 清洗洗衣机清洗洗衣机 清洗下水道 Unit 7 My day 教案教案 1 教学目标教学目标 Teaching aims: 1. Aims on the knowledge: Pupils will learn the new words “a quarter, past, to, half, get up , brush teeth, washface, have breakfast ,have lunch ,have dinner, half, a quarter ”, the new structures “ What time is it? Its. What time do you? Iat.21世纪*教育网 2. Aims on the abilities: Develop pupils abilities of listening, speaking, reading and writing. Develop pupils communicative skills. 3. Aims on the emotion: Develop pupils sense of co-operation. Let pupils know they should cherish the time and take care of our teeth. 2 学情分析学情分析 Our students are in Grade four .They are active and curious, interested in new things. After learning English for two years, they have some simple basic English, so the teacher should attach importance to the communication with them, providing them the chances of using language. But SS is from countryside, it is a little difficult for them to understand and use the language.【版权所有：21 教育】 3 重点难点重点难点 Teaching important points: 1. To help the pupils know the new phrases and use the key sentences correctly. 2. To know the third person of the verbs “brush, get, wash, have”. Teaching difficult points Pupils can talk about the time and what they should do at the time. 4 教学过程教学过程 Step 1 Warm up 1. Do and sing the song “What time is it?” (设计意图:边唱边做动作,调动课堂气氛,激发学生的学习兴趣,通过歌 词复习 12 个整点时间和句子”What time is it ? Its . Its time to .) Step 2 Lead in 1. Review four special ways to tell times. 2. Choose some homework, let them correct and pay attention to. (设计意图:复习微课视频中本课时需要掌握的四种时间表达法,再通 过微课视频中的习题反馈的易错点、难点,让学生讨论和总结。将微 课与课堂相结合,做到有始有终。)21cnjy 3. Game “Look and say “. There are some clocks in the time box, let some students come and have a look, then ask and answer with classmates.21*cnjy*com (设计意图:通过游戏,再次巩固时间表达法中的易错点和难点,让学生 在玩中学,玩中记。) Step 3 Presentation Look and learn 1、Lets hear a clock and show a clock. T: What time is it? Ss: Its six oclock. (Show the sun) T: Its six oclock in the morning or in the evening, am or pm? Ss: Its six oclock in the morning or am. T: Its time to . What do you usually do at six oclock in the morning? Ss T: I get up at six. What time do you get up? (板书: get up , What time do you ? I at . ) Let Ss ask and answer, then show the sentence “He/she gets up at .”(板 书: gets up ) 2、learn “brush teeth,” T: What do you usually do after you get up? Can you eat? Ss: . T: After I get up, I brush my teeth. (板书:brush teeth.) Activities: (1). T: Please show me your teeth. Let Ss show teeth to each other, then practice the phrases “my teeth, your teeth, her teeth, his teeth, our teeth, their teeth”.【来源：21世纪教育网】 (2). listen, say and do like “I brush my teeth, she brushes her teeth.” S1: I brush my teeth. S2: I brush my teeth. She/He brushes his/her teeth.www-2-1-cnjy-com S3: (3).Show two photos of teeth. One is bad, the other is good. T: Which one do you like/want? Why? So what should we do with our teeth?21cnjycom Give Ss some tips and let them know we have good teeth that arent for our beauty, but they are also for our healthy.21*cnjy*com (设计意图:将英语课堂生活化,从学生平时的生活起居和熟悉的闹铃 声作为切入点,让学生有话可说。利用肢体语言,帮助学生掌握物主代 词,利用男、女生图片导入动词的三单形式,很形象突破难点。利用活 动活跃课堂气氛,时刻提醒学生要有一个良好的作息和爱牙意识。) 3.use the same way to learn “wash face”. (板书:wash /washesteeth ) Activities: Make sentences. (设计意图:即学即练,利用白板的拖动功能让学生自己来动手托一托, 让枯燥的练习变的有趣。) 4. Look and order. Give them three times and three meals photos. Let them match and learn the new phrases “have/has breakfast, have/has lunch, have/has dinner”. T: Where is he? Who are they? (Let them say the sentences like “I have breakfast at at home /school with.”)【来源：21cnj*y.co*m】 (设计意图:利用闹钟和太阳在天空中的位置,学生很轻松的就能完成 一日三餐的配图,顺利的导入生词。看图片拓展提问 where、who,激 发学生的思维和口语表达能力,同时让学生知道英语就在身边。) 5、Lets chant and make new more chants with desk mates. Chant: I say “brush”, you say “brushes”. I brush my teeth. She brushes her teeth. Brush, brushes, brush, brushes. (设计意图:利用朗朗上口的 chant,巩固练习重点短语,让学生们尝试当 一回作曲家,培养学生的学习兴趣。)21 教育网 Step 4 Practice 1、Pair work Talk about your day with your desk mate. S1: What time do you ? S2: Iat. (设计意图:2 人合作通过问答操练句型,了解彼此的生活作息,增加友 谊。) 2. Listen and draw. a、Listen to Kittys day and draw the times on the clocks. b、Listen, repeat and check the answers. (设计意图:锻炼学生听的能力,熟悉 Kitty 的作息时间。画一画可以使 原本的听力练习变的有趣一点。) 3、Group work. Let four students in a group read and judge the passage about Peters day. Then discuss why you dont like Peters day.www.21-cn- Summary: we should stay a healthy life and arrange the time properly.) 设计意图:利用 Peters day 让学生意识要生活作息要有规律,同时锻 炼学生的阅读能力,培养学生小组合作能力。)【出处：21 教育名师】 Step 5 Homework Level 1 Write a diary about your day and please arrange your time properly. Level 2 、read the new phrases fluently and write them three times. 、Try to read the passage fluently.21 教育名师原创作品 (设计意图:分层作业,因材施教,减轻学困生的负担,让好的学生能“吃” 的饱。) Blackboard design Unit 7 My day get/gets up brush/brushes teeth wash/washes face21 世纪教育网版权所有 have/has breakfast have/has lunch have/has dinner What time is it? Its . What time do you ? I at. oclock a quarter past half past a quarter to 2-1-c-n-j-y