Unit 13 The Properties of Water
Teaching Goals

  1. Talk about water and the ocean.
  2. Practice communicative skills.
  3. Review Modal Verbs.
  4. Write an explanation paragraph. The First Period
Teaching Aims:

  1. Learn and master the new words and the useful expressions of this part.
  2. Learn something about water by doing experiment. 3 Do some listening.
  4. Improve the students’ speaking ability by talking.
Teaching Important Points:

  1.
  2.
  1.
  2.
  1.
Make the students be free to talk about water. Improve the students’ listening ability by listening. How to finish the task of speaking. How to improve the students’ listening ability.
Teaching Difficult Points:
Teaching Methods:
Listening-and-answering activity to help the students go through with the listening material.
  2. Individual, pair or group work to make every student work in class.
  1.
  2.
  3. the multimedia the blackboard an empty glass, a bottle of water and a bottle of vegetable oil
Teaching Aids:
Teaching Procedures: Step 1 Greetings and Lead-in
Read a short poem and guess its name: A letter from . (Water) Dear User, Shame to you all, the Ignorant, I am your life But you seem not to value me Give me all the respect For in me is eternal life If you continue abusing me Surely, all forms of life will wither away Have you ever imagined, Life without me? I tell you, it will be unbearable Think twice For every drop counts...
1
Qs:
  1) What does “Dear user” here refer to?
  2) What does it talk to its users?
  3) On which planet does it exist? -On the earth, which is also called the water planet.
  4) Do you know why it is called “The water planet”? -Because about three quarters of the earth is covered by water. Step2: Pair work: Collect as many words as possible related to water. Qs: How much do you know about water? Is all water fresh or salty?
water
Step3: Talk about the properties of water.
  1. Pair work T: Water is around us and inside us. We can’t go without water. Qs: Why is water so important to living things? Can you point out some of its properties or characteristics? Suggested vocabulary: It's colorless, tasteless, odorless and universal dissolvent. It feels wet; It exists in three forms: liquid, solid, gas, and is cycled through the water cycle; It can absorb a large amount of heat; It sticks together into beads or drops; It's part of every living organism on the planet; etc.
Properties

  2. Group work Learn more about water’s properties by doing some simple experiments and learn to
2
describe an experiment. What property of water does each of the four experiments illustrate? What causes this phenomenon? What’s this phenomenon related to?
① Experiment 1 shows how air pressure causes a piece of thick paper to cling to an upturned glass of water. ② Experiment 2 illustrates how substances with different density behave when placed in the same container. ③ Experiment 3 is an example of how water dissolves substances and objects. ④ Experiment 4 illustrates some of the differences between salt water and fresh water.
  3. T: What other properties of water do you know about?
What causes the following phenomena? Can you explain? ①We can get a lot of nutrients by drinking water and having soup. ②Wood floats on water while iron sinks. ③The coastal areas are often neither too hot nor too cold. ④Why can some living things live at the bottom of the ocean where there is no sunshine? (If these questions are too difficult) Try asking questions about the properties of water and then give answers to them. Step5: Homework Read the text carefully and find out the detailed information about water
  1. properties.
  2. Think as many examples as possible to illustrate water properties.
The Second Period Teaching Aims:
  1. Learn and master the some new words and phrases.
  2. Improve the students’ reading ability.
  3. Enable the students to realize that it is important to protect the water on our planet. Teaching Important Points:
  1. Improve the students’ reading ability.
  2. Master the following phrases: all the way, that is, mix with, take advantage of, manage to do Teaching Difficult Point: How do we make the students understand the reading passage better. Teaching Methods:
  1. Discussion before reading to make the students interested in what they will learn.
  2. Fast reading to get a general idea of the text.
  3. Discussion after reading to make students understand what they’ve learned better.
  4. Careful reading to get the detailed information in the text. Teaching Aids:
  1. the multimedia
3

  2. the blackboard Teaching Procedures: Step 1 Greetings Step 2 Revision and Lead-in Ask someone to illustrate water properties. Step3: Pre-reading Look at the titles in the text below. Do not read the whole text. Pick out the subject of each paragraph. Use the structures below to make six questions related to the subjects. What is/ are ? What does look like? What are different parts of ? What can be compared to? How does work? What are some examples of ? Skim to find the words and phrases which describe the properties of water in the reading text. Scan to Find out some basic facts about life in the oceans. Life on earth began in the oceans about three billion years ago; 99% of the living space on earth is in the oceans; There are about five million (known) species in the oceans; Life in the oceans ranges from tiny plankton to giant whales. T: Yesterday you were required to ask more questions about water’s properties and find out the detailed information about water properties as well. So now let’s have a little quiz about the properties of water. True of false questions:
  1) Water is a liquid at room temperature, and it has a relatively high freezing point.
  2) The reason why water can dissolve most substances on earth is that water has high heat capacity.
  3) Like all the other substances, water gets smaller (contract) when it freezes.
  4) Pure water has a higher freezing point and lighter than salt water.
  5) The salinity of the earth’s oceans is about
  3.5%.
  6) When water freezes, its density increases.
  7) Other recourses such as oil, gas, gold etc is as precious as a drop of rain. (TFFTT FF) Step
  4. While-reading As we all know, Charles Darwin is famous for his “The Origin of Species”. (According to his theory of evolution) Qs:
  1) Was there any life on the earth billions of years ago?
  2) If any, what was the original life like at that time?
  3) Where did it live? -In the deep blue seas.
  4) How does the world take its shape, which is quite different from what it used to be, especially those various organisms? -Billions of years’ natural selection.
4

  2.It is said that 99% of the living space on earth is in the oceans. -Marine life is incredibly rich and varied. Qs:
  1) What does this fact result in?
  2) Can you give some specific numbers or examples? -There are about five million species in the oceans. They range from the tiniest plants all the way up to giants (e.g. sharks and whales).
  3) What does this fact imply? Do you agree? -Water is an excellent medium for life.
  4) Why do you agree that water is an excellent medium for life? (Based on common knowledge) Water is a liquid at room temperature and has a relatively high freezing point; All living creatures need food to survive, but on many occasions the nutrients become available to living things only when they are dissolved by water.
  3.So we know that one of water’s properties is its dissolvability(溶解性). Qs:
  1) Do you know what gives water such a unique property? -The chemical structure of water.
  2) What does the water molecule look like? -A water molecule consists of two hydrogen atoms and one oxygen atom. The two hydrogen atoms are bonded to one oxygen atom to form a 'V' shape. The two hydrogen atoms form a polar molecule, that is, one with a slightly positive end and one with a slightly negative end.
  3) Can you give some other examples which are also resulted from water’s unique chemical structure? -Plants can pull water up their roots via a capillary(毛细管) process; -We can get a lot of nutrients by drinking soup. That’s water’s another property-dissolvability.
  4. Since water is such a universal solvent, it can dissolve just about anything including many gases and solids. As a result, there is sea water. Qs:
  1) Do you know the salinity of the earth’s oceans? -about
  3.5%.
  2) What does it mean?
  3) Have you ever noticed such a phenomenon that in winter water in some containers or small rivers often freezes while that in seas not? Can you explain it? -The salinity of sea water can affect the freezing point of water. Sea water has a lower a freezing point, so even when the temperature of sea water falls below 0℃, sea water is still liquid.
  5. However, no matter whether it is sea water or pure water, “wood floats on water while iron sinks” always works. How do you explain that? What property of water is this? -If a substance has a lower density than water does, it will float on water; Otherwise, it will sink. Qs:
  1) What is density? And what’s the density of pure water? -Density is the relationship between mass and volume and is measured in kilos per cubic meter (kg/m
  3). The density of water is 1,000kg/m
  3.
  2) Does it also go for the phenomenon that Ice looks larger than water of equal mass?
5
-Yes. Water’s density decreases when it turns to ice, so its volume increases.
  3) Does all the water in the same river or ocean have equal density? Tell your reasons. ?No. Changes in salinity and temperature affect water’s density. Cold water of high salinity usually is most dense and will tend to sink to the bottom of the ocean.
  6. Qs:
  1) What do different densities in the ocean result in? -Dense water sinks and less dense water is pushed to the surface. Thus water in the ocean is always moving.
  2) What phenomena can this result help us explain? Please give examples. (If necessary, give students some hints such as showing a picture etc.) Ocean motion helps move nutrients around and adds energy to the marine ecosystems. Different marine creatures live in different levels of the ocean. (Because of the foods they need, sunshine etc.)
  7. Read following statement and think what conclusion you can draw? Or what property does it refer to? It is said that a man of 60kg loses about 1L water through breath and skin evaporation (皮肤蒸发) every day. In other words, 539kcal heat is released in these two ways. If so much heat were kept in human body, it would raise body temperature by 9℃. Can you imagine the result? -Water has a relatively high heat capacity and can accommodate the climate automatically. It can absorb and release a lot of heat without big changes in its temperature, thus creating a stable environment.
  8. Here are some more familiar phenomena. What property of water is each of them related to? The coastal areas are often neither too hot nor too cold. (Water’s high heat capacity) Ice floats on water. (Density) When the sea water in a container is evaporated (蒸发), there will be some salt left. (Dissolvability) Irrigate in winter can help raise the soil temperature. (Water’s high heat capacity) People swimming in the Dead Sea float; they can even read a paper while lying on their back in the water. (salinity and density) Step5 Language points
  1.provide…for e.g. The company will provide food and drink for them.
  2. have an opportunity to do something e.g. I had no opportunity to discuss the problem with her yesterday.
  3.a variety of e.g. He left for a variety of reasons. There are a variety of patterns for you to choose from.
  4. contribute to
6
e.g. His work has contributed to our understanding of this difficult subject. Step
  6. Homework Try to think as many examples as possible to show that water is made use of to bring benefit to human beings.
7
 

相关内容

高二下学期 Unit 13 高二英语新教材教案

   Unit 13 The Properties of Water Teaching Goals 1. Talk about water and the ocean. 2. Practice communicative skills. 3. Review Modal Verbs. 4. Write an explanation paragraph. The First Period Teaching Aims: 1. Learn and master the new words and the ...

高二英语课件:高二英语上学期Unit 4

   People laugh and people cry Some give up some always try Some say hi while some say bye Others may forget you but never I. A rhyme Life Life can be good, Life can be bad, Life is mostly cheerful, But sometimes sad. By Langston Hughes Life can be di ...

初一英语上学期_Unit1_教案

   《英语》 (新标准)(三年级起始用) 初中一年级上册 Module One Unit One Nice to meet you 湖南株洲师专附属中学 何其钢(412007) 课 设 计 理 念 题 教 学 目 标 教 学 重 点 教学难点 学习策略 教 具 Module One Unit One Nice to meet you 1、分层指导下的任务设计:面向全体学生,为不同层次的学 生提供展示自己才能的机会。 2、根据学生的兴趣爱好设计活动,在学中玩,在玩中学,让 学生在用英语“做事”并解 ...

一年级英语下学期Unit_1教案

   Unit 1 The First Period Let’s act 一、教学目标 1. 知识目标: 用祈使句 Show me your present. Try your new shoes.给出简单指令。 2.能力目标:听懂简单命令并作出反应,用所学命令相互交流。 3.情感目标:回忆过年时的快乐氛围,激发学习兴趣。 二、教学重点:present, shoes 的识记 教学难点:try 的发音 三、教具准备: 1.cassette 1B and a cassette player 2.a p ...

高二英语Unit 17 单词解析

   Unit 17 Disabilities 1. disability (1) (2) 作不可数名词,表示"无能力,失去能力",常作主语. His disability prevents him from holding a job.他的无能使他不能胜任工作. 作可数名词,表示"缺陷",常作主语,宾语或表语. 在巴黎不讲法语实在是一个缺陷. He gets money from government because of his disabilities ...

初二英语新目标八年级下册Unit 1period1

   key vocabulary 1 live to be 200 years 2 in the future 3 make predictions 4 have robot in your home 5 five years from now 6 study at home on computer 7 use money 8 less pollution 9 what do you think life will be in 100years? 10 Will you live in the ...

初二英语新目标八年级下册Unit1 period3

   Unit 1 Will people have robots? 1活到 活到200 岁 2在将来 活到 在将来 4在你的家里有机器人 5 5 年后 在你的家里有机器人 7用纸币 脑学习 用纸币 9 你认为 你认为100年后的生活是怎样的 年后的生活是怎样的 10一年后你将会住在同一个屋子里 一年后你将会住在同一个屋子里 3做预言 做预言 6在家里通过电 在家里通过电 8 更少的污染 1 live to be 200 years old 2 in the future 3 make predi ...

二年级英语上册Unit1教案4

   Module 5 Unit 1 一课教学设计 教材分析:Module 5 Unit 1 一课是在第二、四模块的基础上,理解 新的语言项目“What are they? They are …”并在课文所设 计情景的基础上, 重点学习句型 “Where are they? They are in the lounge/dining room/bedroom/bathroom.” 教学重点:能理解并掌握句型“Where are they? They are in the lounge/dining ...

高三英语全套教案 Unit 10 (人教版)

   高考资源网(www.ks5u.com) ,您身边的高考专家 Unit 10 I. 单元教学目标 技能目标Skill Goals 技能目标 ▲Talk about American literature ▲Practise predicting and describing what a story might be about ▲Review all the verb tenses ▲Write a book review II. 目标语言 . Predict and describe wh ...

初中英语新教材Go for it! Unit 2说课稿

   初中英语新教材 Go for it! Unit 2 说课稿 一、 背景分析 1.教材概述 . 此套教材是人民教育出版社和美国 Thomson Learning 出版集团首次合作的系列产品, 它是在 Thomson Learning 2000 年最新出版的教材 Go for it 的基础上,合作编写而成。 它集合了美式英语的特点也融入了中国的教学理念,整书没有一个中文字,意在强迫学生 用英语的思维去学习英语,创造一种学习英语的氛围,本书着重于文化背景知识和学习策 略等部分,较其他教材增加了任务 ...

热门内容

八年级英语期末考试卷答案

   八年级英语期末考试卷答案 一、听力答案(每小题 1 分,共 20 分) 听力答案( 1-5 BCBCA 6-10 CBBCA 11-15 ABCAB 16-20 BBCCA 笔试部分答案: 笔试部分答案: (每小题 二、 每小题 1 分,共 20 分) ( 2125 BCDAB 2630 BDACD 3135 CACDA 3640 CBDAA (每小题 三、 每小题 1 分,共 15 分) ( 4145 BACBC 4650 ACBDC 5155 ACDBA (每小题 四、 每小题 2 分, ...

小学三年级英语试卷 人教版期末试卷1

   小学三年级英语试卷 人教版期末试卷 1 听力部分 一。 Listen and choose 听音选择单词(10 分) ( )1. A. Saturday B. Sunday C. science ( )2. A. brother B. mother C. father ( )3. A. projects B. policeman C. pictures ( )4. A. sing B. second C. songs ( )5. A. dance B. draw C. drum ( )6. ...

英语试卷

   2010 年西湖区八校联考 英语问卷 英语问卷 考生须知: 1,本试卷满分 120 分,考试时间 100 分钟. 2,答题前,在答题卷上写上学校,姓名和考号. 3,做听力时,先将答案划在试卷上.听力结束后,你有一分钟的时间将试卷上的答案填到答题卷上. I.听力部分 (25 分) . 一,听短对话,回答问题(共 5 小题,计 5 分) 听短对话,回答问题 听下面五段对话,每段对话后有一个小题,从题中所给的A,B,C 三个选项中选出最佳选项,并标在 试题的相应位置.听完每段对话后,你都有 10 ...

人教高二英语(下)重点、难点、考点120题

   阳光家教网 www.szygjj.com 家教学习资料 更多家教学习资料下载 人教高二英语( 人教高二英语(下)重点,难点,考点 120 题 重点,难点, (units11-13) 1.Although medical science control over several dangerous diseases, what worries rs is that some of them are returning. A. achieved B. has achieved C.will ac ...

英语六级常考近形

   英语六级常考近形、近义词辨析 1.transaction /transition /transformation /transmission transaction:"交易,事务,事项";"办理,执行" transition:"过渡,过渡时期" transformation:"改变,改观,改造" transmission:"传送,传递,传达,传导" 典型考题分析: [ 例 1 ] The ...