中学高中英语 unit1 the world of our senses welcome to the unit课件 .ppt(课件中不含音视频素材)
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1、Welcome to the unit课件描述:课件描述:本课件就五种感觉在学生生活和学本课件就五种感觉在学生生活和学习中的重要性为话题,设计情景让学生习中的重要性为话题,设计情景让学生参与到听和说的活动中来,提供相关图参与到听和说的活动中来,提供相关图片和讨论话题。学生通过讨论不仅练习片和讨论话题。学生通过讨论不仅练习了听说技能,而且激活了内容图式,为了听说技能,而且激活了内容图式,为Reading的教学做好了铺垫。的教学做好了铺垫。The world of our sensesBrainstorming With what can we see and hear?How can we kn
2、ow whether a dish is delicious?How can we know that a flower has a pleasant smell?What do we do when we want to know whether the water in the basin is hot or cold?Fill in the tableWe dowiththe senseseeeyessightheartastesmelltouch/feelearshearingtongue/taste budstastenosesmellhands/feet/skintouchRead
3、 the short passage quickly and then answer the questions quickly.1.What would happen if you lost one or two of your senses?Sometimes sense affect one another;sometimes when one of the sense fails,other senses become stronger.2.Do you know how blind people can read?They can read by touching raised do
4、ts which represent numbers and letters.This system is called.Braille.3.How do the deaf communicate with each other?They use body language or sign language.Look at the four pictures and answer the question below each picture.1.What can you see in this picture?2.How would you judge the length of the t
5、wo lines?3.How can you prove that the two lines are straight?4.Can the symbols be read in only one way?5.Why are people misled by their own eyes.When he got there,he _ that there was a dark hole.He _ into it,but could _ nothing.He _ with his ears,he could _ nothing,either.He _ it for a long time.He
6、_ something strange.He _ the side of the hole.It _ hot.Suddenly some noises were _ from the hole.It _ like someone was cooking inside.Fill in the blanks with words that have something to do with“senses”.noticednoticedlookedlooked seeseelistenedlistenedhearhearwatchedwatchedsensedsensedfelt/touchedfe
7、lt/touchedfeltfeltheardheardsoundedsoundede.g.We see the world with our eyes.Without the sense of sight,we would live in total darkness.We _ with _.Without We _ with _.Without _,_,we would_.we would_.Lets talk about the importance of each sense.sensessensessight,hearing,taste,smell and touch.sight,h
8、earing,taste,smell and touch.1.To see is to 1.To see is to believe.believe.Move or not?Which blue circle is bigger,a or b?Which blue circle is bigger,a or b?Are the eyes of the same height?Are the eyes of the same height?How many people can you see in the picture?After seeing these pictures,what do
9、you think of the saying to see is to believe?In most cases,the saying is true.However,sometimes our senses will cheat us.To see the world clearly,we should also be armed with scientific knowledge and think twice before action.Discussion 2.Some people can not remember something until they have seen i
10、t.Others only need to hear something once or twice before they can remember it.Which sense helps you learn best?How does it help you?Discussion3.Do you know of any people who have made great achievements even if they have lost the ability to use one of their senses?What did they achieve?What do they
11、 have in common?What do they have in common?They all made great achievements even if They all made great achievements even if they lost some of their senses.they lost some of their senses.Live Live like tomorrow is the end of the world;like tomorrow is the end of the world;lovelovelike youlike youve
12、 never been hurt;ve never been hurt;Work Work like you donlike you dont need money;t need money;Study Study like tomorrow is the day for final exams.like tomorrow is the day for final exams.To be a person with passionTo be a person with passionHomework 1.Preview the reading part,do Exercise C1 and C
13、2.2.Preview the reading strategy.第五章 燃料燃料第第2 2课时课时二氧化碳的制二氧化碳的制法法5.3二氧化碳的性质和制法5.3二氧化碳的性质和制法知识点实验室怎样制取二氧化碳知识点实验室怎样制取二氧化碳1 1药品:药品:_ _。2 2反应原理:反应原理:_ _。注意注意 一般不用碳酸钙粉末、碳酸钠、碳酸钾一般不用碳酸钙粉末、碳酸钠、碳酸钾等物质,因为反应速率太快,不易控制。等物质,因为反应速率太快,不易控制。一般不用浓盐酸,一是因为加入浓盐酸后的反一般不用浓盐酸,一是因为加入浓盐酸后的反应速率太快,不易控制;二是因为浓盐酸易挥发,应速率太快,不易控制;二是因为
14、浓盐酸易挥发,使制得的气体中混有氯化氢杂质。使制得的气体中混有氯化氢杂质。大理石大理石(或石灰石或石灰石)和稀盐酸和稀盐酸CaCOCaCO3 32HCl=CaCl2HCl=CaCl2 2H H2 2O OCOCO2 25.3二氧化碳的性质和制法不可用稀硫酸,因为稀硫酸与大理石反应生成不可用稀硫酸,因为稀硫酸与大理石反应生成微溶于水的硫酸钙,覆盖在大理石的表面,一段微溶于水的硫酸钙,覆盖在大理石的表面,一段时间后使反应停止。时间后使反应停止。3 3发生装置与收集装置发生装置与收集装置(1)(1)发生装置:因反应物是发生装置:因反应物是_(_(填状态填状态),反应条件是反应条件是_,所以选择的实验
15、装置与,所以选择的实验装置与实验室用实验室用_制取氧气的装置类似。制取氧气的装置类似。固体和固体和液体液体 常温常温 过氧化氢过氧化氢 5.3二氧化碳的性质和制法(2)(2)收集装置:因二氧化碳收集装置:因二氧化碳_,一般,一般不用排水法收集;二氧化碳的不用排水法收集;二氧化碳的_,可用向上排空气法收集。,可用向上排空气法收集。密度比空气密度比空气的大的大 能溶能溶于水于水 5.3二氧化碳的性质和制法4 4实验步骤实验步骤(1)(1)按要求组装好仪器。按要求组装好仪器。(2)(2)检查装置的气密性。检查装置的气密性。(3)(3)向锥形瓶中放入块向锥形瓶中放入块状大理石状大理石(或石灰石或石灰石
16、)。(4)(4)向长颈漏斗中注入向长颈漏斗中注入稀盐酸。稀盐酸。(5)(5)收集气体。收集气体。图图5355.3二氧化碳的性质和制法5 5检验:把制得的无色、无味的气体通入检验:把制得的无色、无味的气体通入_中,若中,若_,则,则说明该气体为二氧化碳,化学方程式为说明该气体为二氧化碳,化学方程式为_。6 6验满:将验满:将_放在放在_,若,若_,则证明瓶内已收,则证明瓶内已收集满二氧化碳。集满二氧化碳。澄清石灰水澄清石灰水 澄清石灰水变浑浊澄清石灰水变浑浊燃着的木条燃着的木条 集气瓶口集气瓶口 木条熄灭木条熄灭5.3二氧化碳的性质和制法探究点一实验室制取二氧化碳的装置的确定探究点一实验室制取二
17、氧化碳的装置的确定 情景展示情景展示 5.3二氧化碳的性质和制法 问题问题探究探究 如何选择适宜的仪器用于制取并收集二氧化碳如何选择适宜的仪器用于制取并收集二氧化碳气体?气体?思考思考交流交流 5.3二氧化碳的性质和制法 归纳归纳提升提升 选择实验室制取气体的发生装置主要是根据反应选择实验室制取气体的发生装置主要是根据反应物的状态物的状态(固体固体、固体液体、液体液体固体固体、固体液体、液体液体)和反应条件和反应条件(反应是否需要加热反应是否需要加热),收集装置的选,收集装置的选择依据主要是气体的密度和水溶性。实验室用大择依据主要是气体的密度和水溶性。实验室用大理石和稀盐酸在常温下反应制取二氧
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