为您找到与高一英语必修二三单元短语相关的共200个结果:
作为高中生掌握好每一个英语短语,有利于我们提高英语水平。下面就让读文网小编给大家分享一些高一英语必修一重点短语吧,希望能对你有帮助!
spend one’s time in many different ways;
enjoy doing things by oneself; go swimming;
go for an outing; have an outing at (the seashore);
see the sights of Beijing; play the piano (violin);
play chess (basketball); have a swim;
have dances on weekends; have a picnic over the weekend;
go to the cinema; have a party; hold a sports meeting;
do some reading; help sb do sth; enjoy a family trip;
get everything ready for;
ride one’s bike with sb.to(the park);
There are a lot of activities at (the beach).
We enjoy a change from our busy life in the city.
She would like to bring sth. to the picnic.
It was a very relaxing Sunday.
There are good programmes on TV on weekends.
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对于英语的学习,我们要运用正确的方法。下面是读文网小编为大家收集整理的高一英语必修一单元考试题目,相信这些文字对你会有所帮助的。
第一部分 听力(共两节,满分30分)
第一节 (共5 小题;每小题1.5分,满分7.5分)
听下面5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,并标在试卷的相应位置。听完每段对话后,你都有10秒钟的时间来回答有关小题和阅读下一小题。每段对话仅读一遍。
1. What’s the rent for a room for two weeks?
A. $150. B. $300. C. $400.
2. Where does the conversation take place?
A. In a clothes shop. B. In a restaurant.
C. In an office.
3. What’s the relationship between the two speakers?
A. Neighbors. B. Friends. C. Workmates.
4. How did the man feel when the professor called on him in class?
A. Relaxed. B. Unhappy. C. Frightened.
5. What’s the woman looking for?
A. A wristwatch. B. A young lady.
C. A young man.
第二节(共15小题;每小题1.5分,满分22.5分)
听下面5段对话或独白。每段对话或独白后有几个小题,从题中所给的A、B、C三个选项中选出最佳选项,并标在试卷的相应位置。听每段对话或独白前,你将有时间阅读各个小题,每小题5秒钟;听完后, 各小题将给出5秒钟的作答时间。每段对话或独白读两遍。
听第6段材料,回答第6至7题。
6. What has the man bought?
A. Two hamburgers and French fries.
B. Two hamburgers and two Cokes.
C. Two hamburgers, French fries, and two Cokes.
7. How much does he have to pay?
A. $8.50. B. $9.15 C. $9.50.
听第7段材料,回答第8至10题。
8. What is the woman doing?
A. Renting a house. B. Working in the office.
C. Riding on a bus.
9. Where is the woman living now?
A. To the south of the city.
B. To the north of the city.
C. In the center of the city.
10. Why would the woman like to find a flat in the city?
A. Because she needs more time to study in the city. B. Because she is afraid to go home at night.
C. Because she wants to go on a trip.
听第8段材料,回答第11至13题。
11. What does the man want to sell?
A. Furniture. B. Garden supplies.
C. An apartment.
12. Why does the man want to sell his belongings?
A. Because he needs money.
B. Because he is moving.
C. Because he likes new things.
13. Why will he make changes in what has been written?
A. To make it clearer to understand.
B. To open his own business.
C. To make it cheaper to print.
听第9段材料,回答第14至17题。
14. What are Mike and Rose doing?
A. Having a picnic.
B. Having lunch in a restaurant.
C. Enjoying supper at home.
15. What season is it?
A. Spring. B. Summer. C. Autumn.
16. Where are Mike’s parents?
A. At home. B. In San Francisco.
C. In San Diego.
17. What is Rose going to do?
A. Cook supper. B. Have a cold drink.
C. Eat apple pie.
听第10段材料,回答第18至20题。
18. Why was the bicycle invented?
A. Because people didn’t like riding horses.
B. Because people were interested in riding bicycles rather than horses.
C. Because people needed new means of transportation besides horses.
19. Why did people move from the countryside and small towns to cities?
A. Because they could find more work in the cities.
B. Because they could live more comfortably in the cities.
C. Because they thought the transportation was more convenient in the cities.
20. Which of the following statements is TRUE?
A. The first bicycle appeared in 1719.
B. In the 18th century, the bicycle was named “the horse on wheels”.
C. In the 18th century, every family had a horse.
听力填空题(选做)根据你所听到的信息完成下列表格中第18至20题;每小题不超过三个单词。
History of Bicycles
In the 18th century:
Cities became 18. ______________.
On 19. ________:
countryside.
People liked to leave the cities and had a good time in the
In 1790:
The first bicycle appeared.
In 1861:
Bicycles 20. _________________.
Everyone could ride bicycles — men and women, boys and girls.
第二部分 英语知识运用(共两节,满分45分)
第一节 语法和词汇知识(共15小题;每小题1分,满分15分)21. — Shall we go to the art exhibition ?
— It’s up to you.
A. right away B. so far
C. ever since D. or else
22. This is the factory ______ I visited last week.
A. what B. which C. where D. it
23. In the ______ house the firefighters saved a lot of______ people, but they couldn’t be sent to the hospital because of the blocked road.
A. damaged; ruined B. destroyed; damaged
C. damaged; injured D. destroyed; ruined
24. His English teacher is a young girl, ____ left college only last year.
A. who B. that C. which D. as
25. His strength after running such a long distance.
A. gave away B. gave out
C. gave up D. gave off
26. — Do you like him?
— No. He is a person who always judges ______ appearances.
A. with B. for C. by D. from
27. This film isn’t suitable for children. It’s too ______.
A. frightened B. fright
C. frighten D. frightening
28. — Excuse me, where is the post office?
— ______ of the road.
A. At the end B. In the end
C. On the end D. To the end
29. They talked about the persons and things ______ they remembered at school.
A. which B. who C. that D. whom
30. Hearing the sad news, he his head in his hands and began to cry.
A. placed B. hid C. laid D. buried
31. Everyone likes to live in a house ______ windows face the south.
A. whose B. which C. its D. and which
32. It is reported that the floods have left about _______ people homeless.
A. two millions B. two-millions
C. two million D. two millions of
33. A great ______ of foreign guests come to our school for a visit every year.
A. deal B. number C. many D. amount
34. The helicopter (直升飞机) arrived at the scene of the accident quickly to ______ the survivors.
A. keep B. protect C. shake D. rescue
35. The farmers in that area are in a terrible ______ because of the water shortage.
A. direction B. point
C. disaster D. attitude
第二节 完形填空 (共20小题; 每小题1.5分, 满分30分) It was Tom’s first visit to England, and he was looking forward to his first journey on London’s Underground Railway. And against his friends’ 36 , he was determined to travel 37 .
He entered the station shortly after five o’clock in the afternoon. This is a 38 time to travel in London, 39 crowds of people go home from work at this hour. He 40 to join a long line of people waiting for tickets. When at last his 41 came, he had some difficulty in making himself understood by the ticket seller. 42 , he got the right ticket in the end and by asking people the 43 , he also found the right platform. It was 44 with people. He did not 45 to get on the first train, but he was able to move nearer to the platform so as to be in a better 46 to get on the next one. When this train came in, Tom was 47 forward onto the train by the 48 of people from behind. The doors closed and the train moved off. He was unable to see the 49 of the stations where the train 50 , but he knew that the station he wanted was the sixth 51 along the line. When the train reached the sixth station, Tom got off, feeling 52 that his journey had been so easy. But he suddenly realized that he had come to a station he had never
53 . He explained his 54 to a man who was standing on the platform. With a 55 on his face, he told Tom that he had caught a train going in the opposite direction.
36. A. thought B. advice C. relation D. favor
37. A. alone B. abroad C. along D. away
38. A. short B. certain C. possible D. bad
39. A. for B. and C. so D. but
40. A. planned B. had C. happened D. hoped
41. A. luck B. time C. chance D. turn
42. A. Thus B. Instead C. Therefore D. However
43. A. question B. way C. place D. condition
44. A. packed B. caught C. covered D. seized
45. A. manage B. try C. agree D. expect
46. A. situation B. state C. position D. seat
47. A. fought B. swept C. drawn D. brought
48. A. speed B. support C. strike D. push
49. A. signs B. points C. names D. numbers
50. A. left B. stopped C. started D. moved
51. A. part B. pause C. stop D. arrived
52. A. glad B. sick C. sorry D. tired
53. A. heard of B. talked about C. thought of D. arrived at
54. A. result B. mistake C. difficulty D. ticket
55. A. joke B. smile C. surprise D. pity
第三部分 阅读理解(共20小题;每小题2分,满分40分)
A
Ann was on her first package trip in Rosas, Spain.
At the hotel, she checked in, and then went to her room to change before dinner. She was just ready to go downstairs when she found that her Spanish money wasn’t in her handbag. She carefully looked in all her luggage, but she couldn’t find it. All she had was a small purse with ten English pound notes in it!
Ann found a place to change her English money. She had very few pesetas (西班牙货币单位), and she would be here for two weeks. On her way back to the hotel, Ann bought some cheese, some bread and some oranges. When she got back, she told the manager that her doctor had told her not to eat Spanish food; she’d just have breakfast each day, as she knew the price of hotels included breakfast.
For the rest of her holiday, Ann swam in the hotel swimming pool, or lay on the beach and got a sunbath. When the other tourists went to interesting places, she always said she wasn’t well. In fact, her holiday wasn’t bad, except that she was always hungry. After all, a piece of fruit for lunch, and bread and cheese for supper isn’t very much ...
Late in the afternoon of their last day, a girl, Jane, asked her why she never ate with them in the hotel restaurant. Ann told her about her money problems. Jane looked at her for a minute, and then said, “But didn’t you know? The price of this holiday includes everything!”
56. “A package trip” probably means ________.
A. a free trip
B. a long journey
C. a pleasant trip
D. a trip that includes the cost of all the tickets and services
57. Ann didn’t eat dinners in the restaurant of the hotel because __________.
A. she was afraid that she couldn’t pay for them with her little money
B. her doctor told her not to eat them
C. she wasn’t well
D. she wasn’t hungry
58. Why did Ann buy some cheese, some bread and some oranges?
A. Because they were good for her health.
B. Because she planned to eat them instead of lunch and supper.
C. Because she liked them more than dinners in the hotel restaurant.
D. Because she is afraid that she couldn’t eat enough in the hotel restaurant.
59. How do you think Jane would feel after she heard Ann’s answer?
A. Angry. B. Happy. C. Surprised. D. Excited.
B
Death Valley is one of the most famous deserts in the United States, covering a wide area with its sand. Almost 20 percent of this area is well below sea level, and Badwater, a salt water pool, is about 280 feet below sea level and the lowest point in the United States.
Long ago the Indians called this place “Tomesha”— the land of fire. Death Valley’s present name dates back to 1849, when a group of miners coming from Nevada became lost in its unpleasantness and hugeness and their adventure turned out to be a sad story. Today Death Valley has been called a National Monument (遗迹) and is crossed by several well-marked roads where good services can be found easily. Luckily the change created by human settlement has scarcely (几乎没有) ruined the special beauty of this place.
Here nature created a lot of surprising sights, almost like the sights on the moon, ever-changing as the frequent (频繁的) wind moves the sand about, showing the most unusual colors. One of the most astonishing and changeable parts of Death Valley is the Devil’ s Golf Course, where it seems hard for one to tell reality from terrible dreams. Sand sculptures (沙雕) stand on a frightening ground as evening shadows move and lengthen.
60. According to the first paragraph, ______ is the lowest place in the United States.
A. Tomesha B. Death Valley
C. Nevada D. Badwater
61. It can be inferred from the passage that _______.
A. no one had ever known the desert before the miners
B. it’s still not easy to travel across the desert
C. people can now find gas-stations, cafes and hotels in the desert
D. people have greatly changed the natural sight of the desert
62. Devil Golf Course is famous for _______.
A. the frequent wind B. the colors of the sand
C. dream-like sights D. the sand sculptures
63. From the passage we can see that the writer _______ the Death Valley.
A. appreciates B. is fearful of
C. dislikes D. is tired of
C
How much paper do you use every year? Perhaps you can’t answer that question quickly. In 1900 the world’s use of paper was about one kilogram for each person in a year. Now some countries use as much as 100 kilograms of paper for each person in a year. The amount of paper a country uses shows how far advanced the country is, some people say. It is difficult to say whether this is true: different people mean different things by the word “advanced”. But countries like the United States, England and Sweden certainly use more paper than other countries.
Paper, like many other things that we use today, was first made in China. In Egypt and the West, paper was not very commonly used before the year 1400.
The Chinese first made paper about 2,000 years ago. China still has pieces of paper which were made as long ago as that. But Chinese paper was not made from the wood of trees. It was made from the hairlike parts of certain plants.
Paper was not made in southern Europe until about the year 1100. Scandinavia — which now makes a great deal of the world’s paper — did not begin to make it until 1500. It was a German named Schaeffer who found out that trees could be made into the best paper. After that, the forest countries of Canada, Sweden, Norway, Finland, and the United States became the most important in paper making. Today in Finland, which makes the best paper in the world, the paper industry is the biggest in the land.
64. The underlined word “advanced” in the first paragraph probably means ________.
A. big B. small C. developed D. beautiful
65. Paper was first made in ________.
A. China B. Egypt
C. the West D. southern Europe
66. The man who first made paper from trees was a (an) ___.
A. Chinese B. Egyptian
C. Canadian D. German
67. Which country makes the best paper in the world today?
A. Canada. B. Finland.
C. Sweden. D. Norway.
D
“After four days in hospital, a 35-year-old woman died of bird flu in the western part of Indonesia on Tuesday, raising the country’s deaths to 57, and the source of infection (传染) was still unknown,” a senior health ministry official said.
The H5N1 virus has killed at least 153 people worldwide since it began hitting Asian poultry (家禽) in late 2003, according to the World Health Organization, with over a third of the human deaths in Indonesia.
Most of those killed have been infected by house-kept poultry, but WHO fears the virus could turn into a form that easily spreads among humans, causing a nationwide disease with the possibility to kill millions.
Indonesia, the world’s fourth most populous (人口稠密的) country and home to millions of backyard chickens, is looked upon as a possible hot place for that to happen.
The government came under fire for moving slowly to get rid of the virus when it first appeared in chickens and ducks, but has worked hard in recent months to make the public know about the dangers of bird flu.
It has also increased vaccinations (接种疫苗) and killing of birds in infected areas. But no one knows whether the action will work. After all, bird flu has been there for more than two years and killed so many people.
68. This passage probably appears on the ________ page of a newspaper.
A. sports B. entertainment
C. health and life D. travel
69. The underlined part “came under fire” in Paragraph 5 probably means _________.
A. caught fire B. became angry
C. got criticized (批评) D. was warm
70. Since late 2003, the H5N1 virus has killed more than 50 people ________.
A. in Indonesia B. in Asia
C. all over the world D. in Europe
71. Which of the following statements is TRUE according to the passage?
A. Millions of people in Indonesia will be killed by the H5N1 virus.
B. Indonesia is a hot place for bird flu to happen because it has a big population of humans and chickens.
C. The government of Indonesia didn’t do anything against bird flu.
D. The source of inflection that killed the 35-year-old woman was a bird.
E
A person who is deaf when he is born is usually dumb (哑的) as well. There may be nothing wrong with his mouth and tongue, but he cannot speak. This is because he cannot hear people, so he has nothing to imitate (模仿). He may try to make sounds himself, but cannot hear his own voice. However, even though he finds it difficult to speak and cannot hear, he can learn to read. Nowadays such persons can also be taught to speak because we have modern methods and equipment, but we did not have these when Helen Keller was born.
Even with modern methods and equipment, however, it is not easy for deaf children to learn to speak, though most of them succeed. When a child is deaf and blind as well, it becomes much more difficult, though it is possible. Helen Keller was born in 1880. She became very ill at the age of nineteen months. Medical knowledge was not as great then as it is now. She did not die but lost her sight and hearing. As a result, she became dumb as well. Her parents did their best to teach her, but she couldn’t speak by the age of six.
Then, in 1887, a teacher, Miss Sullivan, came to live with her. Miss Sullivan herself had been blind. She had been partly cured. Though she could not see very well, she was not blind. Helen was a difficult pupil at first, but in a month Helen had learned how to understand signs and how to make them herself. At last in spite of her great difficulties, Helen learned to read, write and speak, even though she was deaf and blind. She even went to college and had full education. She wrote many books, and though other people have written books about her, her own books are the ones that best explain how it feels to be deaf, dumb and blind. Her best book is The Story of My Life. Perhaps you have read it. Though it was written in 1902, it is still a very interesting book. Even if you have not read it, you may have heard of Helen Keller.
72. A person who is deaf at birth is also dumb because ___.
A. there’s something wrong with his mouth and tongue
B. he cannot hear other people and he has nothing to imitate
C. he doesn’t like to speak
D. he cannot hear his own voice
73. Deaf and dumb children can be taught to speak nowadays because ________.
A. we have modern methods and equipment
B. these children are eager to learn to speak
C. they can hear something
D. they have grown up
74. When Helen was nineteen months old, _______.
A. she died of illness
B. she was healthy
C. she was very ill
D. she began to learn to speak
75. How long did it take Keller to understand signs?
A. A few days. B. Several years.
C. A moment. D. A month.
第四部分 写作(共两节,满分35分)
第一节 短文改错(共10小题;每小题1分,满分10分)
I often dream of a teacher. I dream of standing on the 76. ______
platform in the classroom and give lessons to lovely boys
77. ______
and girls. I teach them, play with them, but watch them
78. ______
growing up. I am always young when I was staying
79. ______
with them. I know there is not easy to be a teacher. You
80. ______
have to learn in order to teach. With enough knowledge,
81. ______
you can never learn well. What is more, you have to
82. ______
be friends with your pupils and take good care of him.
83. ______
Only in this way can you be a good teacher and win
84. ______
respect from them. Though I am a student now,
I will work as very hard to make my dream come true.
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每结束一单元的学习,及时进行检测是巩固学生知识能力的最佳方法。下面是读文网小编为您带来的高一地理必修二单元测试及答案,希望对大家有所帮助。
以上就是读文网小编分享的高一地理必修二单元测试及答案,欢迎翻阅。
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答题时,字迹要清楚,不要潦草,是提高试卷分数的秘诀之一。下面是读文网小编为您带来的高一地理必修二第三单元试题及答案,希望对大家有所帮助。
以上就是读文网小编今天分享的高一地理必修二第三单元试题及答案全部内容,相信对你会有帮助的。
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初一英语上册第五单元的短语句型知识点有哪些呢?接下来是读文网小编为大家带来的关于初一英语上册第五单元短语句型知识点,希望会对大家有所帮助。
t’splaysoccer.=LetusplaysoccerLetmehelpyou.
letsbdosth让某人做某事(sb代表人,如果是代词用宾格,do代表动词原形)
2,那听起来不错Thatsoundsgood.
3,play+球类表示“踢,打,玩......”playfootball
play+棋类playchess
play+the+乐器表示“弹奏……乐器”playthepiano
4,interesting修饰物interested修饰人beinterestedin···对···感兴趣
boring修饰物bored修饰物
relaxing修饰物relaxed修饰物relax动词放松Relaxyourself
5,很多体育收藏品agreatsportscolletion
6,everyday每天everyday日常的
7,做运动playsports
语法:初中英语语法基础知识,也是初中英语考试的复习重点,河南中招英语考试。
1,句中不含be(am,is,are)动词的一般疑问句的变法----也就是说句中谓语动词是实义动词时,要变为一般疑问句,在句首加do/does(第一人称变第二人称,动词变原形其他的语序不变。
Ihaveacomputer.Doyouhaveacomputer?
Shelikesplayingping-pang.-Doesshelikeplayingping-pang.
2,一般句子中当主语是第三人称单数的时候,谓语动词要起变化。具体的变化为:一般情况加s,know-knows,以s,x,ch,sh,o结尾的加es,teach-teaches,go-goes,以辅音字母加y结尾,把y改为i,再加esstudy-studies
3,do/does叫做助动词(语法需要加上去翻译部出来的动词)时,后面接动词原形,
Doeshelikereading?Shedoesn’tlikereading.Shedoesn’tdoherhomework.
但是如果做实义动词(能翻译出来意思的动词)呢,遇到主语第三人称单数就要起变化。
看过初一英语上册第五单元短语句型知识点的还看了:
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教案是保证教学顺利进行的重要资料。下面是读文网小编为您带来的高一化学必修2第一单元教案,希望对大家有所帮助。
第二节 化学计量在实验中的应用
第一课时
[要点剖析]
1.将一定数目的原子、离子或分子等微观粒子与可称量物质联系起来的物理量叫“物质的量”。符号:n,单位:mol。
物质的量不是物质的质量,摩尔是物质的量的单位,不是物理量。
2.大量实验证明,任何粒子或物质的质量以克为单位,在数值上与该粒子的相对原子质量或相对分子质量相等时,所含粒子的数目都是6.02×1023 。我们把含有6.02×1023个粒子的任何粒子集体计量为1摩尔。6.02×1023mol—1叫做阿伏加德罗常数,是个物理量,符号NA。如,O2的相对分子质量为32,32g O2所含的分子数就约是6.02×1023,所以32g O2又可称之为1mol O2。
3.n、N、NA三者的关系:n=N/NA n=m/M。
[典型例析]
例1.同质量的下列气体中,所含分子数最多的是( ),原子数最少的是( )。
A.CH4 B.CO2 C.H2S D.N2
[剖析]质量相同时,不同物质之间的物质的量之比就等于其摩尔质量之比的倒数,所以,本题选项中,相对分子质量最小的物质,其分子数就最多。原子数的多少还需考虑到分子中的原子总数,在已知分子数之比的前提下,再分别乘以各原子数,即能比较相对多少。
[解答]A;B
[评点]质量、物质的量、摩尔质量三者的关系式要能灵活运用,如相同分子数时质量之比如何?相同原子数时质量之比又如何?
例2.下列说法正确的是 ( )
A.氧的摩尔质量是32 g?mol-1
B.硫酸的摩尔质量是98g
C.CO2的相对分子质量是44g
D.CO32—摩尔质量是60g/mol
[剖析]描述物质的摩尔质量时,必须指明具体微粒。A项中的“氧”,未指明是氧原子还是氧分子,所以叙述有误,应为O2的摩尔质量是32 g?mol-1;摩尔质量的单位是g?mol-1,B项中单位表示有误;相对分子质量是个比值,单位为1,C项中也是单位表示有误;复杂离子的摩尔质量在数值上就等于组成离子的各原子相对原子质量总和。
[解答]D
[评点]表示物质的摩尔质量时,要将该物质所对应的微粒表示出来;在运用物理量的过程中,务必要正确表明单位。
例3.amolH2SO4中含有b个氧原子,则阿伏加德罗常数可以表示为 ( )
A.a/4bmol-1 B.b/amol-1 C.a/bmol-1 D.b/4amol-1
[剖析]含有6.02×1023个粒子的任何粒子集体计量为1摩尔。6.02×1023mol—1叫做阿伏加德罗常数,符号NA。amolH2SO4中含4amol氧原子,相当于b个氧原子,所以1mol氧原子,相当于b/4a。
[解答]D
[评点]NA表示每摩物质所含微粒的个数,一般可表示为6.02×1023mol—1,描述微粒数可用NA表示,如2molO2的分子数相当于2NA,若要求得具体个数,可根据6.02×1023mol—1进行换算。
例4.含有相同氧原子数的二氧化硫和三氧化硫其物质的量之比为 ,质量比为 ,分子数之比为 ,硫原子个数比为 。
[剖析]SO2与SO3的氧原子数相同,根据最小公倍数可知,两者的个数比为3∶2时氧原子数相同,所以物质的量之比为3∶2;根据n=m/M关系式,两者质量之比为3×64∶2×80=12∶10;分子数之比即物质的量之比;每个分子里含硫原子数相同,所以,硫原子个数之比也是3∶2。
[解答]3∶2、12∶10、3∶2、3∶2
[评点]两种物质分子数之比即物质的量之比,根据分子组成再求得各组成元素的原子个数之比、质量之比、包括电子数、质子数等等。
例5.已知铁的相对原子质量是56,则1个铁原子的质量是 g。
[剖析]Fe的摩尔质量是56g?mol-1,1molFe原子有6.02×1023个,所以每个铁原子的质量为:56g/6.02×1023=9.30×10-23g
[解答]9.30×10-23g
[评点]任何粒子或物质的质量以克为单位,在数值上与该粒子的相对原子质量或相对分子质量相等时,所含粒子的数目都是6.02×1023。Fe的相对原子质量是56,所以,56gFe含6.02×1023个Fe原子。
例6.已知8gA能与32gB恰好完全反应,生成22gC和一定量D,现将16gA与70gB的混合物充分反应后,生成2molD和一定量C,则C的摩尔质量为多少?
[剖析]一个化学反应的进行必须遵循质量守恒定律,根据题中第一个条件,我们可以求得生成物中D的质量为18g,即8gA完全反应时,生成了18gD;再根据第二个条件,16gA完全反应,B只需64g,生成D的质量应是36g,知道了D的质量和物质的量就不难求出它的摩尔质量。
[解答]M(A)=36g/2mol=18g/mol
[评点]化学反应前后要掌握两条线,一是反应前后元素的种类和原子的个数相变;二是各反应物和生成物的质量成正比。
[巩固练习]
1.下列对于“摩尔”的理解正确的是 ( )
A.摩尔是国际科学界建议采用的一种物理量
B.摩尔是物质的量的单位,简称摩,符号为mol
C.我们把含有6.02×1023个粒子的任何粒子的集体计量为1摩尔
D.1mol氧含6.02×1023个O2
2.下列说法正确的是 ( )
A.摩尔质量就等于物质的式量
B.摩尔质量就是物质式量的6.02×1023倍
C.HNO3的摩尔质量是63g
D.硫酸和磷酸的摩尔质量相等
3.某原子的摩尔质量是Mg?mol-1,则一个该原子的真实质量是 ( )
A.M g B.1/M g
C.M/6.02×1023 g D.6.02×1023/M g
4.若50滴水正好是m mL,则1滴水所含的分子数是 ( )
A.m×50×18×6.02×1023 B.(m/50×18)×6.02×1023
C.(18m/50)×6.02×1023 D.(18×50×m)/6.02×1023
5.现有CO、CO2、O3(臭氧)三种气体,它们分别都含有1mol氧原子,则三种气体的物质的量之比为 ( )
A.1∶1∶1 B.1∶2∶3
C.3∶2∶1 D.6∶3∶2
6.4.9g某物质含有3.01×1022个分子,则该物质的摩尔质量是 。
7.⑴0.3molNH3分子中所含质子数与 个H2O分子中所含质子数相等。
⑵0.4molAl3+的Al2(SO4)3中所含的SO42-的物质的量是 。
8.19g某二价金属氯化物中含有0.4molCl-,则ACl2的摩尔质量是 ,A的相对原子质量是 ,ACl2的化学式是 。
9.大量实验证明,任何粒子或物质的质量以克为单位,在数值上与该粒子的相对原子质量或相对分子质量相等时,所含粒子的数目都是 。
而1mol任何粒子或物质的质量以克为单位时,在数值上都与该粒子的
或 相等。
叫做摩尔质量。
[课后提升]
10.下列有关阿佛加德罗常数(NA)的说法错误的是 ( )
A 32克O2所含的原子数目为NA
B 0.5molH2O含有的原子数目为1.5NA
C.1molH2O含有的H2O分子数目为NA
D.0.5NA个氯气分子的物质的量是0.5mol
11.下列物质中氧原子数目与11.7g Na2O2中氧原子数一定相等的是 ( ) A.6.72L CO B.6.6g CO2
C.8 g SO3 D.9.6g H2SO4
12.铅笔芯的主要成分是石墨和黏土,这些物质按照不同的比例加以混和、压制,就可以制成铅笔芯。如果铅笔芯质量的一半成分是石墨,且用铅笔写一个字消耗的质量约为1mg。那么一个铅笔字含有的碳原子数约为 ( )
A.2.5×1019个 B.2.5×1022个
C.5×1019个 D. 5×1022个
13.n g O2中有m个O原子,则阿伏加德罗常数NA的数值可表示为 ( )
A.32m/n B.16m/n
C.n/32m D.n/16m
14.已知16gA和20gB恰好完全反应生成0.04molC和31.76gD,则C的摩尔质量为多少?
15.某固体仅由一种元素组成,其密度为5g/cm3,用X射线研究该固体的结果表明:在棱长为2×10-7cm的立方体中含160个原子,则此元素的相对原子质量约为多少?
第二课时
[要点剖析]
1.阿伏加德罗理论:相同温度和压强下,相同体积的任何气体都含有相同数目的粒子(分子或原子)
推论:
① 同温同压下,气体的体积之比就等于其所含分子数之比(即气体的物质的量之比)。
②同温同体积时,气体的压强之比与其所含分子数成正比。
③同温同压下,同体积的不同气体,质量与其摩尔质量成正比。
④同温同压下,气体的密度与气体的摩尔质量成正比。
⑤同温同压下,同质量的不同气体,体积与其摩尔质量成反比。
2.气体的摩尔体积:单位物质的量的任何气体在相同条件下应占有相同的体积。这个体积称为气体摩尔体积,符号为Vm,气体的摩尔体积与气体体积(V)、气体的物质的量(n)之间的关系为Vm=V/n
在标准状况下,气体的摩尔体积为22.4L/mol。应用时,需注意物质的状态和条件。
[典型例析]
例1.同温同压下两个容积相等的贮气瓶,一个装有NO气体,另一个装有N2和O2的混合气体,两瓶内的气体一定具有相同的 ( )
A.质量 B.原子总数 C.分子总数 D.密度
[剖析]根据阿伏加德罗理论:相同温度和压强下,相同体积的任何气体都含有相同数目的粒子,同条件下气体体积的大小只与气体分子数有关,与气体的种类无关,所以两贮气瓶中的气体具有相同的分子数。NO是双原子分子,N2和O2也是双原子分子,所以两瓶气体也具有相同的原子数。而质量和密度与气体的摩尔质量有关,N2和O2混合气体的平均摩尔质量与两者的组成相关,本题中N2与O2的体积比是不确定值,所以质量和密度也就不能确定。
[解答]BC
[评点]两瓶气体的分子数相同,所含气体的物质的量相同,所以若两瓶气体的摩尔质量相同,则质量相同,密度也就相同了,想一想:N2和O2的体积比是多少时,两瓶气体质量相同。
例2.在273K和101kPa的条件下,将2.00g氦气、1.40g氮气、1.60g氧气混合,该混合气体的体积是 ( )
A.6.72L B.7.84L C.10.08L D.13.44L
[剖析]273K和101kPa条件下,气体的摩尔体积是22.4L/mol,某一条件下,气体的体积取决于气体分子总数的多少,与气体的种类无关。2.00g氦气、1.40g氮气、1.60g氧气物质的量共0.6mol,所以总体积是13.44L。
[解答]D
[评点]一定条件下,气体混合后,体积的大小只取决于气体分子总数,与分子类型无关,气体的总体积具有加和性。想一想:若要求得三种气体的平均摩尔质量,应如何求解?
例3.下列两种气体的分子数一定相等的是 ( )
A.质量相等、密度不等的CO和N2
B.等温等体积的O2 和N2
C.等体积等密度的CO和N2
D.等压等体积的O2 和N2
[剖析]气体的分子数与气体本身的质量无关;相同物质的量的两种气体,无论是单一气体,还是混合气体,其所含气体分子数一定相同,与气体所处的条件和状况无关;但一般在同条件下,同体积的气体才具有相同的分子数。CO和N2的相对分子质量相同,质量相等时,两者物质的量相同,所以一定含有相同的分子数;B选项中缺少等压这一条件;C选项中等体积等密度也就相当于等质量,所以也含有相同的分子数;D选项中缺少等温这一条件。
[解答]AC
[评点]物质的量相同的气体,具有相同的分子数;相同条件下相同体积的气体具有相同的分子数。注意相互间的因果关系,如不同条件下的两气体的摩尔质量之比就是其相对分子质量之比,与条件无关。
例4.由CO2、H2和CO组成的混合气体在同温同压下与氮气的密度相同。则该混合气体中CO2、H2和CO的体积比为 ( )
A.29∶8∶13 B.22∶1∶14 C.13∶8∶29 D.26∶16∶57
[剖析]同温同压下,不同气体的密度之比等于气体的相对分子质量之比(混合气体的相对分子质量是指平均相对分子质量),氮气的相对分子质量是28,如果混合气体的平均相对分子质量为28,则满足题意。混合气体中CO气体的相对分子质量也是28,所以只要CO2和H2两种气体的平均相对分子质量是28,就满足题意。CO2的相对分子质量是44,H2的相对分子质量是2,可以根据交叉法,求得两气体的体积比是(28-2)/(44-28)=13/8,所以三种气体的体积比只要满足13∶8∶x,平均相对分子质量就是28。
[解答]CD
[评点]结合阿伏加德罗定律的应用,同学们可以适当的拓展,要熟悉几种物理量的换算关系,如本题中同温同压下,气体的密度之比等于其相对分子质量之比,有时,可以根据未知气体对某已知气体的密度之比(又称相对密度),求得该气体的相对分子质量,混合气体的平均相对分子质量数值上等于气体的平均摩尔质量,若是两种组分,可以根据平均相对分子质量和各组分气体的相对分子质量,利用交叉法求得体积比。
[巩固练习]
1.下列有关气体摩尔体积的描述中正确的是 ( )
A.单位物质的量的气体所占的体积就是气体摩尔体积
B.通常状况下的气体摩尔体积约为22.4L
C.标准状况下的气体摩尔体积约为22.4L
D.相同物质的量的气体摩尔体积也相同
2.下列叙述正确的是 ( )
A.同温同压下,相同体积的物质,其物质的量一定相等
B.任何条件下,等物质的量的甲烷和一氧化碳所含的分子数一定相等
C.1L一氧化碳气体一定比1L氧气的质量小
D.相同条件下的一氧化碳气体和氮气,若体积相等,则质量也相等
3.下列有关气体体积的叙述中,正确的是 ( )
A.一定温度和压强下,各种气体物质体积的大小由构成气体的分子大小决定
B.一定温度和压强下,各种气态物质体积的大小,由构成气体的分子数决定
C.不同的气体,若体积不同,则它们所含的分子数也不同
D.气体摩尔体积指1mol任何气体所占的体积约为22.4L
4.在两个容积相同的容器中,一个盛有HCl气体,另一个盛有H2和Cl2的混合气体。在同温同压下,两容器内的气体一定具有相同的是 ( )
A.原子数 B.分子数
C.质量 D.密度
5.2molCl2和2molCO2相比较,下列叙述中正确的是 ( )
A.分子数相等 B.原子数相等
C.体积相等 D.质量相等
6.根据阿伏加德罗理论,在相同 和 下,相同体积的 都含有相同数目的粒子,所以,
称为气体的摩尔体积,标准状态时,气体的摩尔体积为
L / mol,已知某气体在标准状态下密度为ρg/L,则M、Vm、ρ三者关系是 。
[课后提升]
7.用NA代表阿伏加德罗常数的值,如果ag某气体中含有的分子数为b,则cg该气体在标准状况下的体积是多少L ( )
A.22.4bc/a NA B.22.4ab/c NA
C.22.4ac/b NA D.22.4b/ac NA
8.由CH4和O2组成的混合气体,标准状况下的密度为1g.L-1,则该混合气体中CH4和O2的体积比为 ( )
A.2:1 B.1:2
C.2:3 D.3:2
9.在标准状况下,10gCO和CO2的混合气体的体积为6.72L,则此混合气体中CO和CO2的物质的量之比是 ( )
A.2:1 B.1:2
C.1:1 D.3:4
10.在标准状况下,若VL甲烷中含有的氢原子个数为n,则阿伏加德罗常数可表示为 ( )
A.Vn/22.4 B.22.4n/V
C.Vn/5.6 D.5.6n/V
11.同一状态下,气体的体积之比等于分子个数之比,现有20mLA2气体与30mLB2气体恰好完全反应生成20mL某气体X,则可推出气体X的化学式为 ( )
A.AB2 B.AB3
C.A2B3 D.A3B2
12.由A、B两种气体组成的混合气体8.6g,在标准状态下的体积为8.9L,已知A和B的物质的量之比为3∶1,摩尔质量之比为14∶1,则A可能为 , ,B是 。
13.氢气和氧气的混合气体在0℃和一定压强下体积为aL,点燃后发生反应,待气体恢复至原来温度和压强时,测得其体积为bL,原混合气体中氢气和氧气的体积各是多少?(若将温度改为120℃则结果如何?)
第三课时
[要点剖析]
1.物质的量浓度:单位体积溶液里所含溶质B的物质的量,也称为B的物质的量浓度。
几个关系式:C=n/V、C=1000ρw/M、C1V1=C2V2
2.一定物质的量浓度溶液的配制
配制步骤:
⑴计算:计算溶质的质量或浓溶液的体积
⑵称量固体或量取液体
⑶溶解固体或稀释液体
⑷转移、洗涤(有放热现象的需冷却)
⑸定容
⑹摇匀
⑺装瓶
认识容量瓶,掌握其使用原理和方法
3.误差分析(所配溶液中溶质的实际浓度与理论浓度的比较)
⑴称量时所用砝码生锈。
⑵将烧杯中的溶液转移至容量瓶后,未对烧杯进行荡洗。
⑶定容时,俯视(或仰视)容量瓶刻度线。
⑷固体溶解或浓溶液稀释时伴有散热现象,溶液未冷却即转移到容量瓶中进行定容。
⑸将烧杯中的溶液转移到容量瓶内时,不慎将液体洒到容量瓶外。
⑹将定容后的溶液摇匀后,静置,发现液面低于刻度线,用滴管加少量水使液面重新恢复至与刻度线相平。
⑺定容时,液面不小心超过了刻度线,并用滴管将超出的部分吸去。
⑻其它情况下可能引起的误差,应由同学们在实验研究中补充、总结。
[典型例析]
例1.实验室中有质量分数为98%、密度为1.84g/cm3的浓硫酸。某次化学实验时,同学们需要980mL、浓度为2mol/L的稀硫酸,请你求算出配制稀硫酸所需浓硫酸的体积,并简述实验的操作步骤。
[剖析]这是溶液配制中的有关浓溶液稀释,根据稀释前后溶质的物质的量不变的等量关系,求得所需浓硫酸的体积。这是寓实验操作于一起的化学计算,考虑到实际操作时容量瓶的规格,所取容量瓶的容积应等于或稍大于所配溶液的体积,因此,本实验中所配稀硫酸的体积应以1000mL来进行求解。
[解答]V[H2SO4(浓)]×1.84g/cm3×98%=1L×2mol/L×98g/mol V[H2SO4(浓)]=108.7mL
根据计算所得的结果,先量取108.7mL浓硫酸,在500mL烧杯中加入200mL左右的水,将浓硫酸进行稀释,待稀释液冷却后,再将溶液转移到1000mL容量瓶中,加水至刻度线1~2cm时,将溶液轻轻摇匀,改用胶头滴管逐滴加水,水平观察,注意液面上升的情况,当液面凹面最低点恰好与刻度线相切时,停止加水,最后盖紧瓶塞,将容量瓶倒转数次,将溶液混匀。
[评点]若题中要求出所需水的体积,求解过程中必须考虑到溶液的密度变化,如果没有近似要求,不能以V(总)—V[H2SO4(浓)]=V(水)这样的简单加和式求解。同学们知道,稀释前后溶液的总量是不变的,即:m[H2SO4(浓)]+m(水)=m[H2SO4(稀)]。本实验中若稀硫酸的密度为1.20g/cm3,所需水的质量为1000mL×1.20g/cm3-108.7mL×1.84g/cm3=1000g,水的密度为1.0g/cm3,所以量取的水的体积为1000mL。
例2.密度0.91g/cm3的氨水,质量分数为25%,该氨水用等体积的水稀释后,所得溶液的质量分数为 ( )
A.等于12.5% B.大于12.5% C.小于12.5% D.无法确定
[剖析]氨水的密度水于水的密度,在氨水中加入与之相同体积的水时,水的质量大于氨水的质量。混合后溶质质量不变,而溶液质量超过了原氨水质量的两倍,所以溶液的质量分数比原氨水的二分之一还要少,所以正确选项应是C
[解答]C
[评点]一定质量分数的某溶液中加入等质量的水时,所得溶液的质量分数应是原溶液的一半。但加入等体积的水时,因密度一般不同,所得溶液的质量分数不等于原溶液的一半,可能偏大,也可能偏小。若将溶质相同,质量分数不同的两溶液混合,等质量混合时所得溶液中溶质的质量分数应是原两溶液溶质质量分数之和的一半,若溶液的密度大于1.0g/cm3,将两者等体积混合后,密度大的溶液质量也大,且溶质质量分数也较大,混合的过程可以分为将两者先等质量混合,再加入少量的质量分数大的溶液,这样,所得溶液的溶质质量分数就比等质量混合时大一点。若溶液的密度小于1.0g/cm3,则混合后情况刚好相反。
例3.将质量分数为a%、物质的量浓度为C1mol/L的稀硫酸蒸发掉一定量的水,使其质量分数变为2a%,此时,若物质的量浓度为C2mol/L,则C1和C2的关系为( )
A.2C1=C2 B.2C1﹥C2 C.2C1﹤C2 D.C1=2C2
[剖析]硫酸溶液的密度大于1.0g/cm3,令a% 、2a%两硫酸溶液的密度分别为ρ1、ρ2,根据关系式:C=1000ρw/M,得到C1/C2=ρ1/2ρ2,ρ2>ρ1,所以2C1﹤C2。
[解答]C
[评点]本题的关键在于硫酸溶液的密度是随质量分数的增大而增大。想一想,若是酒精呢?
[巩固练习]
1.容量瓶是用来配制物质的量浓度的溶液的定量仪器,其上标有:①温度、②浓度、③容量、④压强、⑤刻度线、⑥酸式或碱式这六项中的 ( )
A.②④⑥ B.③⑤⑥
C.①②④ D.①③⑤
2.关于容量瓶的使用,下列操作正确的是 ( )
A.使用前要检验容量瓶是否漏液
B.用蒸馏水荡洗后必须要将容量瓶烘干
C.为了便于操作,浓溶液稀释或固体溶解可直接在容量瓶中进行
D.为了使所配溶液浓度均匀,定容结束后,手握瓶颈,左右振荡 。
3.将VLHCl气体(STP)溶于水制得1000mL盐酸溶液,则该盐酸的物质的量浓度为 ( )
A. V/22400mol/L B.1000V/22.4mol/L
C.V/22.4mol/L D.V/11.2mol/L
4.下列溶液氯离子的物质的量浓度与50mL 1 mol·L-1氯化铝溶液中氯离子的物质的量浓度相等的是 ( )
A.150 mL 1 mol·L-1氯化钠溶液
B.75 mL 1.5 mol·L-1氯化钙溶液
C.150 mL 3 mol·L-1氯化钾溶液
D.50 mL 3 mol·L-1氯化镁溶液
5.实验室里需要480ml0.1mol/L的硫酸铜溶液,现选取500mL容量瓶进行配制,以下操作正确的是 ( )
A.称取7.68g硫酸铜,加入500mL水
B.称取12.0g胆矾配成500mL溶液
C.称取8.0g硫酸铜,加入500mL水
D.称取12.5g胆矾配成500mL溶液
6 .在标准状况下,将224LHCl气体溶于635mL水中,所得盐酸的密度为1.18g/cm3,
取此盐酸10.0mL,稀释至1.45L,则稀释后所得稀盐酸的物质的量浓度为多少?
[课后提升]
7.100mL 0.3 mol·L-1 Na2SO4溶液和50 mL 0.2 mol·L-1 Al2(SO4)3溶液混合后,溶液中SO42-离子的物质的量浓度(设体积为二者之和)为 ( )
A.0.2 mol·L-1 B.0.25 mol·L-1
C.0.4 mol·L-1 D.0.5 mol·L-1
8.2.5g某金属加入100ml2mol.L-1的硫酸溶液中,当溶液浓度降到原浓度的一半时(设溶液体积不变),金属还没反应完,该金属可能是 ( )
A.Al B.Zn
C.Fe D.Mg
9.Al、Mg混合物与适量的稀硫酸恰好完全反应,将溶液蒸干得固体质量比原固体增加了4.8克,则该混合物的物质的量可能为 ( )
A.0.04mol B.0.03mol
C.0.06mol D.0.05mol
10.若以W1和W2分别表示浓度为amol.L-1和bmol.L-1氨水的质量分数,且知2a=b,则下列推断正确的是(氨水的密度随浓度增大而减小) ( )
A.2W1=W2 B.W1=2W2
C. W12W1
11.在下列三个实验中:①配制一定物质的量浓度的溶液②pH试纸的使用③过滤、蒸发,均用到的仪器是 ( )
A.试管 B.胶头滴管
C.玻璃棒 D.漏斗
12.用质量分数为98%、密度为1.84g/cm3的浓硫酸配制100mL1.84mol/L的稀硫酸,若实验仪器有:A.100mL量筒;B.托盘天平;C.玻璃棒;D.50mL容量瓶;E.10mL量筒;F.胶头滴管;G.50mL烧杯;H.100mL容量瓶,实验时应选用仪器的先后顺序是(填入编号): 。
13.在50mL稀硝酸、稀盐酸的混合酸中,加入100mL0.2mol/LNaOH溶液正好中和;另取50mL这种混合酸加入过量AgNO3溶液时,可产生0.7175g白色沉淀。计算混合酸中硝酸和盐酸的物质的量浓度分别为多少?
参考答案
第一章第二节第一课时
1.BC2.D3.C4.B5.D6.98g/mol7.⑴1.806×1023,⑵ 0.6mol。8.95g/mol、24、MgCl2 9.6.02×1023、相对原子质量、相对分子质量、单位物质的量的物质所具有的质量 10.A 11.BC 12.A 13.B14.106g/mol15.
150.5
第一章第二节第二课时
1.A2.BD3.B4.AB5.A6.温度、压强、任何气体、单位物质的量的任何气体在相同条件下应占有相同的体积。这个体积称为气体摩尔体积、22.4、M=ρ?Vm 7.A 8.D 9.A 10.D 11.C 12.N2、CO;H2 13.V(H2)=2a/3+b/3、V(O2)=(a-b)/3或V(H2)= 2(a-b)/3、V(O2)=(a+2b)/3;120℃时V(H2)=b、V(O2)=a-b或V(H2)=2a-2b、V(O2)=2b-a
第一章第二节第三课时
1.D 2.A 3.C 4.BC 5.D 6.0.08mol/L 7.C 8.AD 9.A 10.D 11.C 12.EFGCHF 13.0.1mol/L、0.3mol/L
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单元测试能让学生有学习的紧张感,能有动力去及时复习。下面是由读文网小编带来的高一化学必修2单元测试及答案,希望对你有所帮助。
以上就是读文网小编为您整理的高一化学必修2单元测试及答案,欢迎收藏。
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面对考试,你是否也会怯场?平时多做测试能改变这种紧张感。下面是由读文网小编带来的高一化学必修1第一单元测试及答案,希望对你有所帮助。
H | C | N | O | Na | Mg | Al | S | Cl | K | Ca | Fe | Cu |
1 | 12 | 14 | 16 | 23 | 24 | 27 | 32 | 35.5 | 39 | 40 | 56 | 64 |
以上是读文网小编分享的高一化学必修1第一单元测试及答案,欢迎翻阅。
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试题是最好锻炼学生考场应对能力的方法。下面是由读文网小编带来的高一化学必修二第三单元试题及答案,希望对你有所帮助。
以上就是读文网小编为您整理的高一化学必修二第三单元试题及答案,欢迎收藏。
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化学虽说是理科,但需要记忆的知识点也不少。下面是由读文网小编带来的高一化学必修二第三单元总结,希望对你有所帮助。
1、最简单的有机化合物 甲烷
氧化反应 CH4(g)+2O2(g) → CO2(g)+2H2O(l)
取代反应 CH4+Cl2(g) → CH3Cl+HCl
烷烃的通式:CnH2n+2 n≤4为气体 、所有1-4个碳内的烃为气体,都难溶于水,比水轻
碳原子数在十以下的,依次用甲、乙、丙、丁、戊、己、庚、辛、壬、癸
同系物:结构相似,在分子组成上相差一个或若干个CH2原子团的物质互称为同系物
同分异构体:具有同分异构现象的化合物互称为同分异构
同素异形体:同种元素形成不同的单质
同位素:相同的质子数不同的中子数的同一类元素的原子
2、来自石油和煤的两种重要化工原料
乙烯 C2H4 (含不饱和的C=C双键,能使KMnO4溶液和溴的溶液褪色)
氧化反应 2C2H4+3O2 →2CO2+2H2O
加成反应 CH2=CH2+Br2 →CH2Br-CH2Br (先断后接,变内接为外接)
加聚反应 nCH2=CH2 → [ CH2 - CH2 ]n (高分子化合物,难降解,白色污染)
石油化工最重要的基本原料,植物生长调节剂和果实的催熟剂,
乙烯的产量是衡量国家石油化工发展水平的标志
苯是一种无色、有特殊气味的液体,有毒,不溶于水,良好的有机溶剂
苯的结构特点:苯分子中的碳碳键是介于单键和双键之间的一种独特的键
氧化反应 2 C6H6+15 O2→12 CO2+ 6 H2O
取代反应 溴代反应 + Br2 → -Br + H Br
硝化反应 + HNO3 → -NO2 + H2O
加成反应 +3 H2 →
3、生活中两种常见的有机物
乙醇
物理性质:无色、透明,具有特殊香味的液体,密度小于水沸点低于水,易挥发.
良好的有机溶剂,溶解多种有机物和无机物,与水以任意比互溶,醇官能团为羟基-OH
与金属钠的反应 2CH3CH2OH+Na→ 2CH3CHONa+H2
氧化反应
完全氧化 CH3CH2OH+3O2→ 2CO2+3H2O
不完全氧化 2CH3CH2OH+O2→ 2CH3CHO+2H2O (Cu作催化剂)
乙酸 CH3COOH 官能团:羧基-COOH 无水乙酸又称冰乙酸或冰醋酸.
弱酸性,比碳酸强 CH3COOH+NaOH→CH3COONa+H2O 2CH3COOH+CaCO3→Ca(CH3COO)2+H2O+CO2↑
酯化反应 醇与酸作用生成酯和水的反应称为酯化反应.
原理 酸脱羟基醇脱氢.
CH3COOH+C2H5OH→CH3COOC2H5+H2O
第四节 基本营养物质
糖类:是绿色植物光合作用的产物,是动植物所需能量的重要来源.又叫碳水化合物
单糖 C6H12O6 葡萄糖 多羟基醛 CH2OH-CHOH-CHOH-CHOH-CHOH-CHO
果糖 多羟基酮
双糖 C12H22O11 蔗糖 无醛基 水解生成一分子葡萄糖和一分子果糖:
麦芽糖 有醛基 水解生成两分子葡萄糖
多糖 (C6H10O5)n 淀粉 无醛基 n不同不是同分异构 遇碘变蓝 水解最终产物为葡萄糖
纤维素 无醛基
油脂:比水轻(密度在之间),不溶于水.是产生能量最高的营养物质
植物油 C17H33-较多,不饱和 液态 油脂水解产物为高级脂肪酸和丙三醇(甘油),油脂在碱性条件下的水解反应叫皂化反应
脂肪 C17H35、C15H31较多 固态
蛋白质是由多种氨基酸脱水缩合而成的天然高分子化合物
蛋白质水解产物是氨基酸,人体必需的氨基酸有8种,非必需的氨基酸有12种
蛋白质的性质
盐析:提纯 变性:失去生理活性 显色反应:加浓硝酸显黄色 灼烧:呈焦羽毛味
误服重金属盐:服用含丰富蛋白质的新鲜牛奶或豆浆
主要用途:组成细胞的基础物质、人类营养物质、工业上有广泛应用、酶是特殊蛋白质
4、烃的定义:仅含碳和氢两种元素的有机物称为碳氢化合物,也称为烃。
5、烃的分类:
脂肪烃(链状)
烃不饱和烃→烯烃(如:乙烯)
芳香烃(含有苯环)(如:苯)
6、烷烃的命名:
(1)普通命名法:把烷烃泛称为“某烷”,某是指烷烃中碳原子的数目。1-10用甲,乙,丙,丁,戊,已,庚,辛,壬,癸;11起汉文数字表示。区别同分异构体,用“正”,“异”,“新”。
正丁烷,异丁烷;正戊烷,异戊烷,新戊烷。
(2)系统命名法:
①命名步骤:
(1)找主链-最长的碳链(确定母体名称);
(2)编号-靠近支链(小、多)的一端;
(3)写名称-先简后繁,相同基请合并.
②名称组成:取代基位置-取代基名称母体名称
③阿拉伯数字表示取代基位置,汉字数字表示相同取代基的个数
CH3-CH-CH2-CH3 CH3-CH-CH-CH3
2-甲基丁烷2,3-二甲基丁烷
7、比较同类烃的沸点:
①一看:碳原子数多沸点高。
②碳原子数相同,二看:支链多沸点低。
常温下,碳原子数1-4的烃都为气体。
8、有机物之间的类别异构关系
①. 分子组成符合CnH2n(n≥3)的类别异构体: 烯烃和环烷烃;
②. 分子组成符合CnH2n-2(n≥4)的类别异构体: 炔烃和二烯烃;
③. 分子组成符合CnH2n+2O(n≥3)的类别异构体: 饱和一元醇和饱和醚;
④. 分子组成符合CnH2nO(n≥3)的类别异构体: 饱和一元醛和饱和一元酮;
⑤. 分子组成符合CnH2nO2(n≥2)的类别异构体: 饱和一元羧酸和饱和一元酯;
⑥. 分子组成符合CnH2n-6O(n≥7)的类别异构体: 苯酚的同系物,芳香醇及芳香醚;
如n=7,有以下五种: 邻甲苯酚,间甲苯酚,对甲苯酚;苯甲醇;苯甲醚.
⑦. 分子组成符合CnH2n+2O2N(n≥2)的类别异构体: 氨基酸和硝基化合物.
9. 烷烃与卤素单质: 卤素单质蒸汽(如不能为溴水)。条件:光照.
10. 苯及苯的同系物与(1)卤素单质(不能为水溶液):条件-- Fe作催化剂
(2)浓硝酸: 50℃-- 60℃水浴 (3)浓硫酸: 70℃--80℃水浴
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2023人教版高一英语必修一电子课本免费下载
英语是西日尔曼语的一个分支,最早由中世纪的英国使用。那么关于人教版高一英语必修一电子课本怎么学习呢?以下是小编准备的一些人教版高一英语必修一电子课本,仅供参考。
教学准备
教学目标
1、掌握下列词汇和短语: reason, list, share, feelings, Netherlands, German, outdoors, Crazy, nature, dare, thundering, entirely, power, trust, indoors, go through, hide away, set down, a series of, on purpose, in order to, face to face, according to.
2、进一步学习有关“朋友”的知识信息,启发学生对朋友和友谊的思考。
3、了解《安妮日记》的背景知识,在感受外国文化的同时,深刻理解安妮日记的内涵,同时提高学生文化意识。
4、训练学生一定的阅读技巧,使他们掌握一些有效的学习策略,从而提高阅读速度和理解的准确性,并养成一定的自主学习能力。
5、培养学生快速阅读的能力、捕捉信息的能力及运用语言进行交际的能力。
6、通过个人活动、小组活动和班级活动等方法,培养学生的合作互助精神,分享英语学习的经验,感受用英语交流的成功和喜悦。
教学重难点
教学重点:
1、了解《安妮日记》的背景知识,在感受外国文化的同时,深刻理解安妮日记的内涵,同时提高学生文化意识。
2、训练学生的阅读技巧,提高学生阅读速度和理解能力。
教学难点:
对所获得的信息进行处理、加工和学习,形成有效的学习策略。
教学工具
ppt课件
教学过程
...
板书
Uint1 Reading Anne’s Best Friend
Qualities: easy-going ,warm-hearted ,helpful,…
Questions:
Skimming
Summarize
Discussion: 1> style 2> ideas
教案【二】
教学准备
教学目标
■To help students learn to express attitudes, agreement & disagreement and certainty
■To help students learn to read the text and learn to write diaries in English
■To help students better understand “friendship”
■To help students learn to understand and use some important words and expressions
■To help students identify examples of Direct Speech & Indirect Speech (I): statements and questions in the text
教学重难点
Words
upset, ignore, calm, concern, settle, suffer, recover, pack
Expressions
add up, calm down, have got to, be concerned about, go through, set down, a series of, on purpose, in order to, at dusk, face to facer, no longer/ not …any longer, suffer from, get/ be tired of, pack (sth.) up, get along with, fall in love, join in
Patterns
“I don’t want to set down a series of facts in a diary as most people do,” said Anne. →Anne said that she didn’t want to set down a series of facts in a diary as most people do.
I stayed awake on purpose until half past eleven…
…it was the first time in a year and a half that I’d seen the night face to face…
教学工具
ppt
教学过程
Hello, everyone. I’m so glad to be your teacher of English. I’d like to make friends with you, to build up a close friendship with you. Today we shall take Unit 1. The topic of this unit is Friendship. What do you think friendship is?
1. Warming up
⑴ Warming up by defining friendship
Hello, everyone. I’m so glad to be your teacher of English. I’d like to make friends with you, to build up a close friendship with you. Today we shall take Unit 1. The topic of this unit is Friendship. What do you think friendship is?
Yeah, there are many explanations about friendship. However, friendship is a relationship that can’t be restricted(限制)by definition(定义). It can only be experienced. True friendship can exist between any two souls, be it between people or animals. It can happen at any moment, to anyone. Even to lifeless things, like a diary, a ball, a friendship can happen.
Then what is your opinion about friendship?
Do you think that friendship is important to our life? Why?
⑵Warming up by learning to solve problems
Nice to meet you, class. We shall be friends from now on. For everybody needs friends. But being a good friend can sometimes be hard work. Learning how to solve problems in a friendship can make you a better friend and a happier person. Discuss the situation below and try to solve the problems wisely.
Common problems among teenagers
Solution
Some of the common problems include forgetting friends’ birthday, not keeping promises, letting out friends’ secrets and so on.
Maybe we can have a heart-to-heart talk with our friends to ask for forgiveness.
Situation 1: Friends get angry with each other when they try to talk about something difficult.
Try to understand your friend/ Try to talk about the problem in a different way.
Situation 2: Friends don’t know how to apologize
Start by telling each other that you are sorry. A simple apology is often enough and is a good starting point.
Situation 3: Some friends don’t know how to keep secrets.
Keep your secrets to yourself
Tips on being a good friend
Treat your friends the way you want to be treated. Keep secrets that are told to you.
Pay attention when your friend is talking. Keep your promises. Share things with your friend. Tell your friend the truth. Stick up for your friend.
⑶Warming up by doing a survey
Good morning, class. I am your teacher of English. Glad to be here with you. Today we shall take Unit 1 Friendship.
To be frankly, I’d like very much to keep a close friendship with you, my dear students, in the following years. How about you then? Ok, thanks. I do hope to be your good teacher as well as your helpful friend (良师益友).
Now please do the survey on page one.
Add up your score according to the scoring sheet on page 8. You don’t have to tell your results. You can just keep it a secret.
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人教版高一必修一英语电子课本免费下载
高一英语学习是从初中到高中的过渡阶段,那么关于人教版高一必修一英语电子课本怎么学习呢?以下是小编准备的一些高一必修一英语电子课本,仅供参考。
一、指导思想:
在英语教学中,要坚持以下理念的应用:
1、要面向全体学生,关注每个学生的情感,激发他们学习英语的兴趣,帮助他们建立学习的成就感和自信心,使他们在学习过程中发展综合语言运用能力,提高人文素养,增强实践能力,培养创新精神。
2、突出学生主体,尊重个体差异,让学生在老师的指导下构建知识,提高技能,磨练意志,活跃思维,展现个性,发展心智和拓展视野。
3、让学生在使用英语中学习英语,让学生成为Good User而不仅仅是Learner。让英语成为学生学习生活中最实用的工具而非累赘,让他们在使用和学习英语的过程中,体味到轻松和成功的快乐,而不是无尽的担忧和恐惧。
二、教学目标
1、使学生明确学习英语的目的性;
2、优化学生的英语学习方法,使他们能通过观察、体验、探究等主动学习的方法,充分发挥自己的学习潜能,形成有效的学习策略,提高自主学习的能力
3、在培养学生的语言知识、语言技能、情感态度、学习策略和文化意识等素养的基础上发展学生综合运用语言的能力;
三、课时安排
高一要学第三、四模块,供10个单元。每个单元我们会安排5-6个课时。每三周完成两个单元的教学和一次测验,给学生补充一些与课文有关的知识性、趣味性较强的阅读文章。增加学生学习外语的兴趣。并积极为高一段的英语书法比赛,词汇竞赛做好准备,为期中考、期末考做好积极的准备。
四、教学具体措施
1、为了使学生打牢基础不至于出现知识断层,本学期要有计划的把学生上学期学过的但掌握不好的时态、句式、定语从句、以及部分掌握不好的词汇、短语、句型分插于10单元的新课教学中。
2、认真研究新课程标准,尤其与旧大纲不同的地方,清楚哪些内容是新增加的,哪些内容是已经删掉的,哪些内容初中已经学的。3、认真研究新教材,在集体备课的基础上认真备课、上课,认真进行自习辅导和批改作业。
4、单词一直是学生的难点、薄弱点,直接影响学生综合能力的提高,在教学中要重视词汇教学,狠抓单词的记忆与巩固以及对词汇的意义与用法的掌握。使学生掌握科学的单词记忆方法和养成勤查词典的习惯。
5、坚持每周一次作文训练,训练题材、方法力求多样化,并能及时进行讲评。鼓励学生写英文日记,对个别英语特差的学生尽量多批改、多指导。
6、阅读理解能力的培养是高中教学的重点,也是高考的重头戏。在单元教学中专门抽出一节课作为阅读课,材料为课外五篇课外阅读理解,并且有计划的指导学生掌握科学的阅读方法。
7、集体备课是提高教学质量和整体教学水平的有力保证,有利于经验丰富的教师与年轻教师互为补充、共同提高。坚持每周一次的集体备课,集体备课前先确立一名中心发言人,由中心发言人先确定下周所教单元的重点、难点及在高考中的比重及为完成教学内容所用的教法,然后全组人员共同探讨,最后确定下来。中心发言人依次轮流。
8、坚持教学研究和相互听课,年轻教师要向老教师学习如何把握重点、难点和考点,老教师要向年轻教师学习如何灵活运用先进的教法。教师之间互相听课本学期每人不少于30节。
高一英语教学共17周时间,内容必修三,必修四,十个单元 ,并含有月考,期中,和期末考试本学期的进度计划如下
第一周 unit 1(必修3)
第二周 unit1 and unit2
第三周 unit 2
第四周 unit3 月考及评卷
第五周 unit3 and unit4
第六周 unit4
第七周 unit5
第八周 unit5 and unit1(必修4)
第九周 unit1 期中考试及评卷
第十周 unit2
第十一周 unit2and unit3
第十二周 unit3月考及评卷
第十三周 unit4
第十四周 unit4 and unit5
第十五周 unit5
第十六周 复习备考
第十七周 期末考试
备注:第1—4周 时间 3..1—3..28日
第5---8周 时间3.29---4.25日
第9—12周 时间4.26—5.23日
第13—17周 时间5.24—6.27日(除去高考一周时间)
第18—19周 时间 6.28---7,11日
(除去高考一周时间与周末休息时间,实际教学时间至多十七周时间)
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北师大版高一英语必修一电子课本教材下载
预习课本可以帮助同学们高效学习,那么关于高一英语必修一课本该怎么学习呢?一起来看看吧。以下是小编准备的一些北师大版高一英语必修一电子课本,仅供参考。
高一下期是学生逐渐认识和适应高中外语学习的关键时期,我们计划在上期的基础上,继续拓宽学生的知识面,全面培养听、说、读、写四会能力,特别是理解、分析和阅读的能力,让学生尽快适应高中学习。
一、教育教学指导思想
树立新观念,钻研新大纲,探索新教法。
二、教学工作
1、必修课。
本期教学课时仍然紧,教材内容多,知识覆盖面大,在上好教本的同时,要特别考虑拓展学上的课外知识,人文知识,加强课外阅读的补充和指导,具体方法如下:
a) 狠抓单元教学,突出单元教学重点。把握好各个环节如:warming up-speaking; reading; explanation oflanguage points, unit exercises,listening. 让学生不仅学习知识,而且得到能力的培养。
b)增强教改意识。要整体提高学生的思想认识和文化品味。要将“教法指导”转为“学法指导”,重视指导学生思维方法的学习,要引导并鼓励学生的创新意识。相对淡化知识系统,强调运用语言的能力和语感能力的培养,重视积累,感悟和熏陶。新教材中的“口语交际”要让学生充分活动,还要采用多种形式拓展学生的英语实践活动,努力提高学生学习英语的兴趣。
2、课内课外阅读。
a)教师指导阅读,教师除了课文中阅读材料,还要指导学生的课外阅读,备课时要对其内容,重难点,方式方法等都要作通盘考虑。另外还要注意“教本”和“课外阅读”的相关延伸,即“课外阅读”和“教本”具体课文的相关衔接。同时,教师还要对学生进行阅读策略方面的指导。
b) 学生单元小结
1.积累词语,对课文涉及的重要词语,要抄写、查字典解释重点记忆。
2.阅读报刊文章写点评;3.每单元写一百字左右与课文内容相关的作文。
c) 课堂交流,课堂内除了individual activity, pair work, group work, discussion,debate这些活动,还有课外的 team work ,duty report,这些材料都以书面形式和口头形式呈现,最后由教师收集作资料保存。
d) 英语学习小组活动,每个小组每学期都有机会在课堂展示对一篇文章或一个专题的理解,质疑,评析,欣赏.这是学生自主学习和“研究性阅读”的尝试。
3、写作。
a) 根据教材的编写体例,把教本上的"写作"内容与学生练笔结合。
b) 本期拟作作文每单元1次。
c)作文批改要讲实效,要调动学生参与,可先由学生自评或互评,再由老师点评,对其得失进行分析总结,并提倡学生写后记或重作,以期不断提高写作能力。
d) 对优秀的作文可进行交流。
4、充分利用电教手段。
即电脑,投影仪,磁带,录像,影碟机等电教手段,适当的时候使用多媒体教室,使英语课堂更加形象,生动活泼。
三、本学期学生情况分析:
7﹑8﹑9班均为普通班。通过近一周来的摸底,已基本知道了学生的大致情况:
1.基础知识欠帐太多,主要指初中基础词汇、短语及语法,但也有大部分成绩较好的学生对上学期的知识依然很陌生。
2.由于基础知识欠缺较多,他们大多数人缺乏学习积极性及主动性。对英语极为恐惧及厌恶。具体表现在:早晚自习不愿复习所学内容,尤其是早自习不愿开口读书。由于单词欠缺量大,绝大部分学生到了句句有生词的程度,其家庭作业只能乱做、乱抄甚至不做。
3.由于基础知识的缺乏,必然导致基本技能的缺乏,听、说、读、写能极差,这样必然会导致课堂教学进度慢,效果差。
4.大多数学生,由于听不懂课,所以课堂纪律就较差,必然导致学生学习效率低下。对于以上这些问题都必须认真对待及改正,应在上高中教材时,加强初中词汇、短语及基本语法的复习,基础相对较好,可以在上高中课文的时候顺便把课文中的涉及初中的相关知识拓展出来,要求学生记忆掌握。
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外研社版高一必修一英语电子课本免费下载
英语在中世纪早期的英国最早被使用,并最终成为一种使用广泛的语言。那么高一必修一英语电子课本怎么学习呢?以下是小编准备的一些外研社版高一必修一英语电子课本,仅供参考。
新学期,我将担任高一(15)(16)两个普通班的英语老师。面对新的面孔,我充满了期待和热情。本学期,学习的时间短,教学任务重,而这两个班学生的学习基础差,既要抓好初高中衔接的内容建立学生学习的自信和提高学生的学习兴趣,又要抓好教学进度,跟进高一教学的内容,可以说困难重重。然而学生的学习积极性高,针对以上特点,制定本学期英语教学计划如下:
一、普及英语基础知识,重点训练基本句型
由于学生的基础薄弱,甚至对于单词的拼读都无从下手,因此有必要有计划的为学生普及基础的知识,关键是音标,利用音标提高词汇记忆效率,基本词汇掌握的不扎实,对英语的重点句型掌握。为了解决以上的问题,我们每周进行一次基本词汇,重点句型和重点语法的随堂检测,每天课前五分钟采用灵活多样的方法进行听写检查,主要是采用在具体的语境中练习单词拼写的方法,先从最基本的词汇抓起,逐步过渡到句型、小短文的默写检查上。
二、最大限度地提高课堂教学效率,发挥学生的学习积极性和主动性
在上每一节课前,都要先总结前一堂课的教学情况,认真研究教材和教法以及学生的学情,在课堂上最大限度的调动学生的学习积极性和主动性。设计简单一些的问题,逐步引导学生思考,精讲重点词汇、短语及句式,多创设语言情境让学生讨论,对学生进行分组分层教学,设计不同难度的问题与练习,让每个学生都能体验到英语学习的快乐与成功感。
三、以书面表达为主线,提升学生的书面表达能力
书面表达是提高英语学习信心的有效途径,我们在上好阅读课的同时,选取适合学生阅读水平的阅读材料,并且每天进行一次翻译训练,并跟上检查批改。此外每周要开展作文训练,内容根据高考大纲中的24个话题,增加练习形式多样性。
四、加强听力训练,注重听力技巧的`点拨
虽然广东的高考取消了听力考试,但是新增加的15分听说考试对于听力的能力要求很高,必须让学生在高一就进行听力训练,提高整体的能力。们将利用好听力材料,对学生的听力进行强化训练,同时,多指导做题技巧,听力放完后学生把做错的题目汇总,自查并反复阅读听力原文,找出错题原因,然后老师利用合适的时间进行指导,点拨。尤其是在高一最初播放听力的几周时间里,教师要多指导。
五、组织好集体备课,加强相互听课评课,取长补短,共同进步
认真组织好集体备课,最大限度地发挥集体智慧的力量,对教学的重点难点进行讨论,并由主备老师上示范课,其他老师听课并一起评课,对不足之处进行修改,补充,通过相互听课学习,加强教学和指导的针对性,发挥备课组骨干教师的示范作用,同时学习新教师的一些好的教学方法,做到取人之长,补己之短,使整个备课组成员共同成长。
六、换一种独特的方法批改英语作文
我们本学期将一改过去传统的批改作文的方法,采用划出学生作文中正确句子的方法来批改,每次只划出正确的和精彩的句子,并重点标注。这样几乎每个学生都能够写对一个或几个句子,这样做的好处是学生会逐渐由写好几个句子提高到写好大多数句子,也能使学生对写作有成功感。然后我们把学生作文中的好句子进行积累,整合,并印发给学生共同赏析。而不是象原来那样,整篇文章中都是刺眼的错误,学生一看就感觉差距太大,不想继续练了。
总之,在新的学期里,我们高一英语备课组在学校领导的正确领导下,一定群策群力,团结一致,相互学习,共同进步,争取把学生的英语成绩逐步提上去!
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译林版高一英语必修一电子课本2023下载
英语是世界上最广泛使用的第二语言,那么关于译林版高一英语必修一电子课本应该怎么学习呢?以下是小编准备的一些译林版高一英语必修一电子课本,仅供参考。
(1) 课题:Friendship
(2) 教材分析与学生分析:
本单元的中心话题是“友谊”,几乎所有的内容都是围绕这一中心话题展开的。Warming Up部分以调查问卷的形式引导学生了解日常生活中朋友之间发生的真实问题以及解决这些问题的方法;Pre-Reading部分的几个问题启发学生对“友谊”和“朋友”进行思考,使学生明确不仅人与人之间可以做朋友,日记也可以成为人们的朋友;Reading部分Anne’s Best Friend以日记形式讲述了犹太女孩安妮的故事;Comprehending部分通过连句、多项选择和问答形式帮助学生对课文内容、细节进行更深入的理解; Using about Language 部分教学本课重点词汇和重点语法项目。
(3) 课时安排:
The first period:
Speaking:
Warming Up and Pre-Reading
The second period: Reading
The third period: Grammar
The forth Period:Listening
The fifth period: Writing
(4)教学目标:
① 知识与技能:Talk about friends and friendship; Practise talking about agreement and disagreement, giving advice and making decisions; Use direct speech and indirect speech; Learn to write an essay to express and support an opinion.
②过程与方法:本单元在读前阶段就提出问题,让学生思考是不是只有人与人之间才能交朋友,然后在阅读中通过安妮的日记向学生说明我们也可以与动物及无生命的`日记交朋友。在深刻理解、充分训练的基础上,可以再引导学生深入讨论几个与本单元话题有关的问题:
1.描述朋友;
2. 结交网友;
3. 观点交流;
4. 不善交朋友;
5. 朋友的重要性。
③情感态度与价值观:学完本单元后要求学生进行自我评价,主要评价自己在本单元中的学习情况。对书中的内容是否感兴趣,有哪些收获,解决了什么问题。使学生加深对友谊、友情的理解,以及如何正确交友,处理朋友之间发生的问题等。
(5) 教学重点和难点:
词汇:add point upset ignore calm concern cheat share reason list series crazy nature purpose dare thunder entirely power according trust suffer advice situation communicate habit
短语: add up calm down have got to be concerned about go through hide away set down on purpose in order to face to face according to get along with fall in love join in
重点语法项目: 直接引语和间接引语的互相转换
难点:Understand the real meaning of friends and friendship;
Discuss the answers to the questions (Reading);
How to teach the Ss to master the usage of Direct Speech and Indirect
Speech(Statement and Questions).
(6) 教学策略:
Discussion, Student-centered vocabulary, learning, listening, pair work, teach grammar in real situation
(7) 教学媒体设计:
A projector and a tape recorder.
(8) 教学过程:
详见以下分课时教学设计。
(9) 课堂练习与课外作业设计:
穿插于分课时教学设计中
(10)教学反思或值得改进的地方: 见每个课时最后部分。
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