高二英语教案：新教材高二英语unit13全单元分课时教案

1、unit 13 the properties of waterteaching goals:1. talk about water and the ocean2. practice communicative skills3. review modal verbs4. write an explanation paragraphteaching plan: (six periods)1st period: warming-up and reading (1)2nd period: reading (2)3rd period: post-reading and listening (sb)4th

2、 period: integrating skills (sb)5th period: speaking6th period: grammar and language study第1页共17页period 1 warming up & reading (i)teaching goals:1. to get the ss to understand the main properties of water by connecting them with some common phenomena and learning to explain the phenomena.2. to enabl

3、e them to be aware of the importance of water, making good use of water in a proper way and protecting water resources.important points in teaching:words: benefit, available, pure, mass, float, absorb, release, stable, bottom, habitat, dissolve, property.phrases:benefit from, range from ., allto the

4、 way, be made up of, that is, freezing point, break down, mix with, be measured in, take advantage of, keep steady, manage to, be sensitive to, up to.structures: whatever ., ., that is, .teaching procedures:step1: lead inread a short poem and guess its name: a letter from _. (water)dear user,shame t

5、o you all, the ignorant,i am your lifebut you seem not to value megive me all the respectfor in me is eternal lifeif you continue abusing mesurely, all forms of life will wither awayhave you ever imagined,life without me?i tell you, it will be unbearablethink twicefor every drop counts.qs: 1) what d

6、oes“ 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 wo

7、rds as possible related to waterqs:.? how much do you know about water? is all water fresh or salty?第2页共17页waterstep3: talk about the properties of water.1. pair workt:water is around us and inside us. we can t go withoutqs: water.? why is water so important to living things? can you point out some

8、of its properties or characteristics?suggested vocabulary:its 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;its part

9、 of every living organism on the planet; etc.properties2. group worklearn more about water s properties by doing some simple experiments and learnto describe an experiment.what property of water does each of the four experiments illustrate?what causes this phenomenon?what s this phenomenon related t

10、o? experiment 1 shows how air pressure causes a piece of thick paper to cling to an upturned glass of water. experiment 2 illustrates how substances with different density behave when placed in the same container. experiment 3 is an example of how water dissolves substances and objects. experiment 4

11、 illustrates some of the differences between salt water and fresh water.第3页共17页3. t: what other properties of water do you know about?what causes the following phenomena? can you explain? we can get a lot of nutrients by drinking water and having soup. wood floats on water while iron sinks. the coas

12、tal areas are often neither too hot nor too cold. why can some living things live at the bottom of the ocean where there isno sunshine?(if these questions are too difficult ) try asking questions about the properties of water and then give answers to them.step4: pre-readinglook at the titles in the

13、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 _?1. skim to f

14、ind the words and phrases which describe the properties of water in the reading text.2. 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) s

15、pecies in the oceans; life in the oceans ranges from tiny plankton to giant whales.step5: homework1read the text carefully and find out the detailed information about water properties.2think as many examples as possible to illustrate water properties.period 2 reading ( )teaching steps:i. revisiont:

16、yesterday you were required to ask more questions about water sproperties 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

17、 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.第4页共17页4) pure water has a higher freezing point and lighter than salt water.5) the salinity of the earth

18、 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)ii. while-reading1.as we all know, charles darwin is famous for his“the origin ofspecies . ”(according to histheory of evolution)qs: 1) was th

19、ere 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 sel

20、ection.2it is said that 99% of the living space on earth is in the oceans.qs: 1) what does this fact result in? marine life is incredibly rich and varied.2) can you give some specific numbers or examples? there are about five million species in the oceans. they range from the tiniest plantsall the w

21、ay 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

22、 living creatures need food to survive, but on many occasions the nutrients become available to living things only when they are dissolved by water.3so we know that one of water sproperties is its dissolvability( 溶解性 ).qs: 1) do you know what gives water such a unique property? the chemical structur

23、e 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 asli

24、ghtly negative end.3) can you give some other examples whichare also resultedfrom water s uniquechemical 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.thats water sanother property dissolvability.4. since water is such a

25、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 earthsoceans? 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 riv

26、ers 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第5页共17页freezing point, so even when the temperature of sea water falls below0,sea water isstill liquid.5. however, no matter whether it is sea water

27、or pure water,“wood floats on water while ironsinks”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 willsink.qs: 1) what is density? and what sthe density of pure water? density is the re

28、lationship 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? yes. waters density decreases when it turns to ice, so its volume increases.3) does all the

29、 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? de

30、nse 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 e

31、nergy 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 t

32、hrough 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 auto

33、matically.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. (watershigh heat capacity)

34、? 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. (watershigh heat capacity)? people swimming in the dead sea float; they can even read a paper while lying on

35、their back in the water. (salinity and density)iv. homework1. try to think as many examples as possible to show that water is made use of to bring benefit to human beings.第6页共17页period 3 post-reading & listeningteaching goals:1. to get students have a better understanding of water.2. to learn some n

36、ew words and sentence structures.teaching procedures:part one post-readingi. better understand the properties of water1. “where there is water, there is life! ”can you use some facts to illustrate it? water is a medium for life.so far as we know, life only exists on earth, because there is water. et

37、c.2. our planet is a water planet of which two thirds of its surface is covered by water. what smore, our body is also mainly composed of water. do you know following figures which show how muchwater there is in parts of our body?60%, 70%, 82%, 90%? up to _ of the human body is water.? _ of the brai

38、n is composed of water.? _ blood is made up of water.? the lungs are nearly _ water.3. water is the source of life. that s why water is an excellent medium for life. and you know all this is because of water sunique properties.ii. revision on the properties of water1. what are the properties of wate

39、r? water is polar.? water is liquid at room temperature.? water has a relatively high freezing point.? water has density 1,000 kg/m3.? water has high heat capacity.? 2. what causes water to have such unique properties? it s molecule form / chemical structure.3. what is water molecule like? chemical

40、structure: two hydrogen atoms and one oxygen atom.? different parts of it: a slightly positive end and a slightly negative end, so it is polar.?the function of it: it causes water to be able to dissolve both solids and gases, and thatswhy water can break down nutrients quickly.4. do pure water and s

41、alt water have the same chemical structure? does pure water have salinity?qs: 1) what ssalinity?2) what is sea / salt water? a mixture of pure water, dissolved gases and solids.3) how does salinity affect water?4) how does it affect water s weight and freezing point?第7页共17页 the higher salinity water

42、 has, the heavier the water is.the higher salinity is, the lower the freezing point of water is.5. salinity also has something to do with the density of water. the higher salinity is, the higher density of water is.qs: 1) what is density?2) how is density measured?3) which is denser, water or oil?4)

43、 what will happen when water and oil are in the same container? what does this phenomenon illustrate? oil floats on water. a less dense substance floats on a denser substance.5) does water in the same ocean have the same density? no. denser water sinks and pushes less dense water to the surface.6. t

44、hatswhy the ocean water will never stop moving.ocean motionqs: 1) what does ocean motion mean?2) how does ocean motion work? denser water sinks and pushes less dense water to the surface.ocean motion helps move nutrients around and adds energy to the marine ecosystems.3) what causes ocean motion? ch

45、anges in salinity and temperature.7. the temperature of the ocean water always keeps steady, making the ocean a safe and comfortable habitat. do you know why? water has a relatively high heat capacity.qs: 1) what is heat capacity?2) what sthe function of heat capacity? it determines how a substance

46、absorbs and releases heat; it keeps water temperature steady;it keeps the earth stemperature steady.iii. reflection1. there is a close relationship between some properties of water, for example, salinity, density and ocean motion. how do they affect each other?2. suppose you are one of the main prop

47、erties of water(resolvability, salinity, density ). youthink you are the most important and have the greatest effect on life. try to persuade others by describing: 1) what you are.2) what affects you.3) what you are made the most of by human beings.part two listeningi. pre-listeninggive a very brief

48、 introduction of the rime of the ancient mariner and its author samuel taylor coleridge. here rime is the variant of rhyme.ii. while-listening1. listen to the story (part 1) and find the information about it. (when, where, who, what?) when: 18 th century? (no, not mentioned)where: on a ship第8页共17页wh

49、o: sailors / marinerswhat: one of the sailors kills a bird that brings good luck to the ship, by doing which he has brought bad luck and death to the sailors.2. listen to part 1 for the second time and finish the following true or false questions.1) this poem was written by a british poet samuel tay

50、lor coleridge in the 1700s.2) in the poem, one of the sailors kills a fish under the ship.3) it is believed that the animal he kills is one that brings good luck to the ship.4) other sailors are so frightened and angry that they kill the sailor.5)the sailors are extremely thirsty but they can tdrink

51、 the water in the sea, because it is too dirty.(keys: tftff)3. listen to part 1 for the third time and answer the following questions:1) who tells the story in the poem?2) what does one of the sailors do?3) what do you think will happen next?4) why are the other sailors frightened?4. listen to part

52、2 and complete the following sentences.1) finally they decide that he must die _ the mariner who _ the bird.2)he must _ _ it all and will _ by having to tell the story3) _ _ on the ship, _ on the ocean, the mariner suffers from_ and _.4) his story _, the _ mariner says _ and asks them to learn from

53、his_.keys: 1) except, shot;2) live through, pay3) left alone, drifting, loneliness, fear;4) told, ancient, farewell, sufferings5. listen to part 2 again and answer the following questions:1) what happens to the sailors?2) what happens to the mariner?3) why is the person telling the story?4) who is the person actually?ii. while-listening1. reflection: what do you learn from this story? everything existing in the world has their own certain values, we should understand and respect them.2. creationwork with partner and try to come up with a good, scary story like the one about the marine