香烟很昂贵，吸烟者为此花费甚多。英语翻译。

Smoking is bad for health

Smoking KILLS Every year hundreds of thousands of people around the world die from diseases caused by smoking. One in two lifetime smokers will die from their habit. Half of these deaths will occur in middle age. Tobacco smoke also contributes to a number of cancers. The mixture of nicotine and carbon monoxide in each cigarette you smoke temporarily increases your heart rate and blood pressure, straining your heart and blood vessels. This can cause heart attacks and stroke. It slows your blood flow, cutting off oxygen to your feet and hands. Some smokers end up having their limbs amputated. Tar coats your lungs like soot in a chimney and causes cancer. A 20-a-day smoker breathes in up to a full cup (210 g) of tar in a year. Changing to low-tar cigarettes does not help because smokers usually take deeper puffs and hold the smoke in for longer, dragging the tar deeper into their lungs. Carbon monoxide robs your muscles, brain and body tissue of oxygen, making your whole body and especially your heart work harder. Over time, your airways swell up and let less air into your lungs. Smoking causes disease and is a slow way to die. The strain put on your body by smoking often causes years of suffering. Emphysema is an illness that slowly rots your lungs. People with emphysema often get bronchitis again and again, and suffer lung and heart failure. Lung cancer from smoking is caused by the tar in tobacco smoke. Men who smoke are ten times more likely to die from lung cancer than non-smokers. Heart disease and strokes are also more common among smokers than non-smokers. Smoking causes fat deposits to narrow and block blood vessels which leads to heart attack. Smoking causes around one in five deaths from heart disease. In younger people, three out of four deaths from heart disease are due to smoking Please quip smoking for the sake of your health!请采纳 谢谢

Smoking is harmful to your health Smoking is not a good habit because it is harmful to people"s health. If you *** oke a lot,you will be unhealth.Many people *** oke too much every day,they bee thinner and weaker.We know every year many people have died from nicotine. Smoking in the public does harm to people around you. Our government has issued" No *** oking" regulations in airplanes, on trains and at cinemas. Let"s try our best to help the *** okers give up 吸烟有害健康 吸烟不是一种好习惯，因为它是对人们的健康有害。如果你吸烟很多,你将变得不健康。许多人每天抽太多烟,他们变得更瘦弱。我们知道每年有许多人死于尼古丁。吸烟在公众场合也确实影响到周围的人。我们的 *** 已经发布了在飞机上,火车上和在电影院“禁止吸烟”的规定。我们应该尽力帮助吸烟者戒烟。 第二篇供参考我就不翻译了 Smoking is a bad habit that does harm to *** oker and others. Many kinds of diseases and cancers are caused by *** oking, such as trachitis, lung cancer and many other diseases. Recent years, there are tens of thousands of people dying of *** oking. But there still are many people enjoying *** oking, because they think *** oking is a kind of fashion and *** oking is so cool, especially among teenagers. In addition, *** oking does harm to others as well. Second hand *** oking has been recognized harmful to other people. Even worse, it may cause more damages. Therefore, people should remember that *** oking is harmful to others and those people who *** okes should give up *** oking as soon as possible. 　　en 　　Smoking is harmful to your health If you *** oke a lot,you will be unhealth.Many people *** oke too much every day,they bee thinner.Cigarettes are made of Poppy（罂粟）。Although this is a kind of beautiful flowers,it is toxic(有毒) flowers.Either you *** oke a lot every day or *** oke fewer.I suggest you don"t *** oke more cigarettes,because it is good for your health. 请采纳 谢谢了 采纳我吧 谢谢

Tobacco contains nicotine, a substance that is recognized to be addictive byinternational medical organizations.Nicotine fulfills the key criteria for addictionor dependence, including compulsive use, despite the desire and repeatedattempts to quit; psychoactive effects produced by the action of the substanceon the brain; and behavior motivated by the “reinforcing” effects of the psychoactive substance. Cigarettes, unlike chewed tobacco, enable nicotine to reach the brain rapidly, within a few seconds of inhaling smoke, and the smoker can regulate the dose puff by puff. Within the next year, tobacco is expected to kill approximately 4 million peopleworldwide. Already, it is responsible for one in 10 adult deaths; by 2030 thefigure is expected to be one in six, or 10 million deaths each year—more thanany other cause and more than the projected death tolls from pneumonia, diarrhealdiseases, tuberculosis, and the complications of childbirth for that yearcombined. If current trends persist, about 500 million people alive today will eventually be killed by tobacco, half of them in productive middle age, losing20 to 25 years of life. However, the toll of death and disability from smoking outside the high-incomecountries has yet to be felt. This is because the diseases caused by smokingcan take several decades to develop. Even when smoking is very commonin a population, the damage to health may not yet be visible. A person"s risk of developing lung cancer is affected more strongly by theamount of time that they have been a smoker than by the number of cigarettesthey have smoked daily. Smokers affect not only their own health but the health of those around them.Women who smoke during pregnancy are more likely to lose the fetus throughspontaneous abortion. Babies born to smoking mothers in high-income countriesare significantly more likely than the babies of nonsmokers to have a lowbirth weight and up to 35 percent more likely to die in infancy. They also facehigher risks of respiratory disease. The earlier a smoker starts, the greater the risk of disabling illnesses. Inhigh-income countries with long-term data, researchers have concluded thatsmokers who start early and smoke regularly are much more likely to developlung cancer than smokers who quit while they are still young. With all the disadvantages listed above, smoking is strongly not recommended and should definitely be avoided.

Today smoking is a widespread habit ali over the world. Not only the old, the youth, but also middle school students have been engaged in smoking. Many of them think that smoking is a smart symbol.However, smoking is harmful to one"s health. It contributes a lot of lung cancer, from which many people have died in the past years. It can also cause many other diseases. In a word, if you smoke, you do have a much greater chance of losing your health. Furthermore, scientific research shows that smoking is not only harmful to smokers themselves, but also a threat to public health, especially to women and children. Therefore, many countries have made laws forbidding smokers to smoke m public places such as cinemas, stations, hospitals, and so on Giveup smoking! If you don"t smoke, don"t start. Give upsmoking for the sake of your health, for the sake of your family, and for the sake of the whole world.

A popceman is not allowed to *** oke on duty . 警察值班时不准 吸烟 。 Excessive *** oking is harmful to one "s health . 吸烟 过多对身体有害处。 There is a tie-in beeen *** oking and cancer . 吸烟 与癌症有关联。 Never stop! you can talk as you *** oke . 不许停！你可以一面说话一面 吸烟 。 Non- *** okers often disapprove of *** okers . 不 吸烟 的人往往不赞成别人吸烟。 Teachers discountenanced *** oking by the students . 教师们反对学生们 吸烟 。 Shall we sit in a *** oker or a non- *** oker ? 我们坐 吸烟 车厢还是非吸烟车厢？ Smoking has a great deal to do with lung cancer ... 吸烟 和肺癌有很大关系。 Smoke is almost as great a solvent as divorce . 吸烟 和离婚已变成两大消溶剂。 Smoking is bad for you ; you ought to pack it in . 吸烟 对你很不好，应该戒掉。 Does *** oking contribute to lung cancer ? 吸烟 会导致肺癌吗？ Can you feature *** oking here ? 在这种场合 吸烟 ，你能想像吗？ Smoking is not allowed in first class . 头等舱中不准 吸烟 。 Smoking can be damaging to your health . 吸烟 对身体有害。 Smoking is harmful to your health . 吸烟 有害于你的健康。 There is a prohibition against *** oking . 那里禁止 吸烟 。 Gentlemen are requested not to *** oke . 先生们请勿 吸烟 。 He spoke to the class about the dangers of *** oking . 他对班上学生讲了 吸烟 的危害性。 I started *** oking again the day after the funeral . 送葬回来的当天，我又开始 吸烟 了。 All my friends do not *** oke . 我的朋友并不全都 吸烟 。 He stank the whole house out with his tobacco *** oke . 他 吸烟 把整所房子弄得难闻极了。 Smoking is no good for health . 吸烟 无益于身体健康。 Smoking is responsible for many cases of lung cancer . 吸烟 是许多人患肺癌的致病因素。 Smoking does harm to one "s health . 吸烟 妨害健康。 Smoking will tell on you when you "re getting old . 你上年纪时就会感受到 吸烟 的影响了。 Smoking is pernicious to health . 吸烟 对健康有害。 I never *** oke , no sir ! 我从来不 吸烟 ，绝对不吸。 Most doctors advise cutting down on coffee and tobacco . 大多数医生建议少喝咖啡，少 吸烟 。 Smoking is a danger to health . 吸烟 危害健康。 Smoking can cause lung cancer . 吸烟 可致肺癌。 She expostulated with her hu *** and on his habit of *** oking in bed . 她规劝其丈夫改掉在床上 吸烟 的习惯。 To impose a penalty on *** oking in the street is a stretch of the law . 对街上 吸烟 罚款是对法律的滥用。 To impose a penalty on *** oking in the street is a stretch of the law . 对在街上 吸烟 罚款是对法律的滥用。 He *** okes too much . 他 吸烟 过多。 She expostulated with her hu *** and about his habit of *** oking in bed . 她规劝其丈夫改掉在床上 吸烟 的习惯。 They perceive alcohol and tobacco use as symbols of manhood . 他们觉得饮酒和 吸烟 是具有男子汉气质的标志。 He never *** okes . 他素来不 吸烟 。 "no *** oking" is a rule quite unrelated to any procedure . “禁止 吸烟 ”是一条规则，而完全与程序没有联系。

Smoking Is HarmfulIt is said that about half of people in China *** oke. Many young boys and girls have the habit of *** oking, though they are middle school students As we all know, *** oking does great harm to human beings. More and more people have e to realize how serious this problem is. But they are never bored with it. Some people think it is a kind of fashion, some think it is of great fun and others think that *** oking can refresh themselves. Smoking causes many illnesses. A lot of people always cough because of *** oking. The most serious illness caused by *** oking is lung cancer. Meanwhile *** oking is a waste of money. Besides, careless *** okers may cause dangerous fires. In order to keep healthy, we should get rid of the bad habit of *** oking. Please stop *** oking at once 中文翻译：吸烟有害 据说,中国有一半人在吸烟.许多男孩和女孩都有吸烟的习惯,尽管他们还是中学生. 众所周知,吸烟对人身体有害.越来越多的人们认识到这个问题的严重性,但他们仍然乐此不疲.一些人认为抽烟是一种时尚,一些人认为抽烟很有趣,还有一些人认为吸烟可以提神. 吸烟能导致很多疾病.由于吸烟,一些人一直在咳嗽.肺癌是吸烟导致的最严重的疾病.同时,吸烟很浪费金钱.除此而外,粗心的烟民还可能引起火灾. 为了保证人们的身体健康,我们应当改掉吸烟的坏习惯.请立即停止吸烟吧

no smoking 拜托采纳把

1 翻译为 smoking causes fatal lung cancer吸烟导致致命的肺癌2 smokingn.吸烟，抽烟; v.冒烟( smoke的现在分词); 抽烟; 用烟熏制; 吸（烟）; causes[英][kɔ:zɪz][美][kɔ:zɪz]n.原因( cause的名词复数 ); 动机; （某种行为、感情等的）理由; 缘故; fatal[英][ˈfeɪtl][美][ˈfetl]adj.致命的，攸关的; 毁灭性的，严重的; 命中注定的; 重大的; lung[英][lʌŋ][美][lʌŋ]n.肺; 呼吸器官; [医]辅助呼吸的装置; 〈英〉可供呼吸新鲜空气的地方;

吸烟的好处？

18. 定语从句 定语从句（Attributive Clauses）在句中做定语，修饰一个名词或代词，被修饰的名词,词组或代词即先行词。定语从句通常出现在先行词之后，由关系词（关系代词或关系副词）引出。 关系代词有：who, whom, whose, that, which等。 关系副词有：when, where, why等。 18.1 关系代词引导的定语从句 关系代词所代替的先行词是人或物的名词或代词，并在句中充当主语、宾语、定语等成分。关系代词在定语从句中作主语时，从句谓语动词的人称和数要和先行词保持一致。 1）who, whom, that 这些词代替的先行词是人的名词或代词，在从句中所起作用如下： Is he the man who/that wants to see you? 他就是你想见的人吗？（who/that在从句中作主语） He is the man whom/ that I saw yesterday. 他就是我昨天见的那个人。（whom/that在从句中作宾语） 2) Whose 用来指人或物，(只用作定语, 若指物，它还可以同of which互换）, 例如： They rushed over to help the man whose car had broken down. 那人车坏了，大家都跑过去帮忙。 Please pass me the book whose (of which) cover is green. 请递给我那本绿皮的书。 3）which, that 它们所代替的先行词是事物的名词或代词，在从句中可作主语、宾语等，例如： A prosperity which / that had never been seen before appears in the countryside. 农村出现了前所未有的繁荣。（which / that在句中作宾语） The package (which / that) you are carrying is about to come unwrapped. 你拿的包快散了。(which / that在句中作宾语） 18.2 关系副词引导的定语从句 关系副词可代替的先行词是时间、地点或理由的名词，在从句中作状语。 1）when, where, why 关系副词when, where, why的含义相当于"介词+ which"结构，因此常常和"介词+ which"结构交替使用，例如： There are occasions when (on which) one must yield. 任何人都有不得不屈服的时候。 Beijing is the place where (in which) I was born. 北京是我的出生地。 Is this the reason why (for which) he refused our offer? 这就是他拒绝我们帮助他的理由吗？ 2）that代替关系副词 that可以用于表示时间、地点、方式、理由的名词后取代when, where, why和"介词+ which"引导的定语从句，在口语中that常被省略，例如： His father died the year (that / when / in which) he was born. 他父亲在他出生那年逝世了。 He is unlikely to find the place (that / where / in which) he lived forty years ago. 他不大可能找到他四十年前居住过的地方。 18.3 判断关系代词与关系副词 方法一： 用关系代词，还是关系副词完全取决于从句中的谓语动词。及物动词后面无宾语，就必须要求用关系代词；而不及物动词则要求用关系副词。例如： This is the mountain village where I stayed last year. I"ll never forget the days when I worked together with you. 判断改错（注：先显示题，再显示答案，横线；用不同的颜色表示出。） （错） This is the mountain village where I visited last year. （错） I will never forget the days when I spent in the countryside. （对） This is the mountain village (which) I visited last year. （对） I"ll never forget the days (which) I spent in the countryside. 习惯上总把表地点或时间的名词与关系副词 where, when联系在一起。此两题错在关系词的误用上。 方法二： 准确判断先行词在定语从句中的成分(主、谓、宾、定、状)，也能正确选择出关系代词/关系副词。 例1. Is this museum ___ you visited a few days age? A. where B. that C. on which D. the one 例2. Is this the museum ____ the exhibition was held. A. where B. that C. on which D. the one 答案：例1 D，例2 A 例1变为肯定句： This museum is ___ you visited a few days ago. 例2变为肯定句： This is the museum ___ the exhibition was held. 在句1中，所缺部分为宾语，而where, that, on which都不能起到宾语的作用，只有the one既做了主句的表语，又可做从句的宾语，可以省略关系代词，所以应选D。 而句2中, 主、谓、宾俱全，从句部分为句子的状语表地点，既可用副词where，又因 in the museum词组，可用介词in + which 引导地点状语。而此题中，介词on 用的不对，所以选A。 关系词的选择依据在从句中所做的成分，先行词在从句中做主、定、宾语时，选择关系代词 (who, whom, that, which, whose)； 先行词在从句中做状语时，应选择关系副词 ( where 地点状语，when 时间状语，why 原因状语) 。 18.4 限制性和非限制性定语从句 1) 定语从句有限制性和非限制性两种。限制性定语从句是先行词不可缺少的部分，去掉它主句意思往往不明确；非限制性定语从句是先行词的附加说明，去掉了也不会影响主句的意思，它与主句之间通常用逗号分开，例如： This is the house which we bought last month. 这是我们上个月买的那幢房子。（限制性） The house, which we bought last month, is very nice.这幢房子很漂亮，是我们上个月买的。（非限制性） 2) 当先行词是专有名词或物主代词和指示代词所修饰时，其后的定语从句通常是非限制性的，例如： Charles Smith, who was my former teacher, retired last year. 查理u2022史密斯去年退休了，他曾经是我的老师。 My house, which I bought last year, has got a lovely garden. 我去年买的的那幢房子带着个漂亮的花园。 This novel, which I have read three times, is very touching. 这本小说很动人，我已经读了三遍。 3) 非限制性定语从句还能将整个主句作为先行词, 对其进行修饰, 这时从句谓语动词要用第三人称单数，例如： He seems not to have grasped what I meant, which greatly upsets me. 他似乎没抓住我的意思，这使我心烦。 Liquid water changes to vapor, which is called evaporation. 液态水变为蒸汽，这就叫做蒸发。 说明：关系代词that和关系副词why不能引导非限制性定语从句。 18.5 介词+关系词 1）介词后面的关系词不能省略。 2）that前不能有介词。 3） 某些在从句中充当时间，地点或原因状语的"介词+关系词"结构可以同关系副词when 和where 互换。 This is the house in which I lived two years ago. This is the house where I lived two years ago. Do you remember the day on which you joined our club? Do you remember the day when you joined our club? 18.6 as, which 非限定性定语从句 由as, which 引导的非限定性定语从句，as和which可代整个主句，相当于and this或and that。As一般放在句首，which在句中。 As we know, smoking is harmful to one"s health. The sun heats the earth, which is very important to us. 典型例题 1）Alice received an invitation from her boss, ___came as a surprise. A. it B. that C. which D. he 答案C. 此为非限定性从句，不能用 that修饰，而用which.，it 和he 都使后句成为句子，两个独立的句子不能单以逗号连接。况且选he句意不通。 2）The weather turned out to be very good, ___ was more than we could expect. A. what B. which C. that D. it 答案B。which可代替句子，用于非限定性定语从句，而what不可。That 不能用于非限定性定语从句，it不为连词，使由逗号连接的两个句子并在一起在英语语法上行不通。 3）It rained hard yesterday, ____ prevented me from going to the park.. A. that B. which C. as D. it 答案B. as 和which在引导非限制性定语从句时，这两个关系代词都指主句所表达的整个意思，且在定语从句中都可以作主语和宾语。但不同之处主要有两点： (1） as 引导的定语从句可置于句首，而which不可。 (2） as 代表前面的整个主句并在从句中作主语时，从句中的谓语必须是系动词；若为行为动词，则从句中的关系代词只能用which.。 在本题中，prevent由于是行为动词，所以正确选项应为B。 As 的用法 例1. the same… as；such…as 中的as 是一种固定结构, 和……一样……。 I have got into the same trouble as he (has). 例2. as可引导非限制性从句，常带有"正如"。 As we know, smoking is harmful to one"s health. As is know, smoking is harmful to one"s health. As是关系代词。例1中的as作know的宾语；例2中，它充当从句的主语，谓语动词know要用被动式。 18.7 先行词和关系词二合一 1)Whoever spits in public will be punished here. (Whoever 可以用 anyone who 代替) 2)The parents will use what they have to send their son to technical school. (what 可以用all that代替) 18.8 what/whatever;that/what; who/whoever 1）what = the thing which；whatever = anything What you want has been sent here. Whatever you want makes no difference to me. 2) who= the person that whoever= anyone who （错）Who breaks the law will be punished. （错）Whoever robbed the bank is not clear. （对）Whoever breaks the law will be punished. （对）Who robbed the bank is not clear. 3) that 和 what 当that引导定语从句时 ，通常用作关系代词，而引导名词性从句时，是个不充当任何成分的连接词。宾语从句和表语从句中的that常可省略。What只能引导名词性从 句， 用作连接代词，作从句的具体成分，且不能省略。 I think (that) you will like the stamps. What we need is more practice. 18.9 关系代词that 的用法 1）不用that的情况 a) 在引导非限定性定语从句时。 (错) The tree, that is four hundred years old, is very famous here. b) 介词后不能用。 We depend on the land from which we get our food. We depend on the land that/which we get our food from. 2) 只能用that作为定语从句的关系代词的情况 a) 在there be 句型中，只用that，不用which。 b) 在不定代词，如：anything, nothing, the one, all, much, few, any, little等作先行词时，只用that，不用which。 c) 先行词有the only, the very修饰时，只用that。 d) 先行词为序数词、数词、形容词最高级时，只用that。. e) 先行词既有人，又有物时。 举例： All that is needed is a supply of oil. 所需的只是供油问题。 Finally, the thief handed everything that he had stolen to the police. 那贼最终把偷的全部东西交给了警察。 定语从句里的

太多了，而且才30财富

【 #英语资源# 导语】吸烟有害健康，每个人都应该照顾自己的身体。 ！ 【篇一】关于戒烟的高一英语作文 　　At present, many teenagers smoke. I don"t think it"s a good phenomenon. It must be stopped, for smoking is harmful in many ways. 　　目前，很多青少年吸烟。我不觉得这是一个好的现象。这种现象必须要停止，因为吸烟在很多方面都是有害的。 　　First, smoking is bad for our health. As we start smoking, it"s so difficult to give up, because the tobacco contains a drug called nicotine, which can get us into the habit of smoking. When we go without nicotine, our bodies will feel sick. 　　首先，吸烟对我们的健康有害。我们一开始吸烟，就很难戒掉，因为烟草含有一种叫尼古丁的药物，它能让我们养成吸烟的习惯。当我们体内没有尼古丁时，我们就会感到恶心。 　　Second, smoking is so dangerous. When we smoke in bed, we may kill ourselves as well as burn down our houses, for burning cigarette ends may cause a big fire. And if we threw the cigarette ends anywhere, it would also cause a fire disaster. 　　第二，吸烟是危险的。我们在床上吸烟的时候，我们可能会导致自杀或者烧毁房子，杀死自己，因为燃烧的烟头可能引起火灾。如果我们把烟头丢在任何地方都有可能会引起火灾。 　　Furthermore, once we smoke in public, we may make other people feel uncomfortable as well. 　　此外，如果我们在公共场所吸烟，我们可能会让其他人感到不舒服。 　　Accordingly, for the sake of your and others" health, please don"t smoke. 　　因此，为了您和他人的健康，请不要吸烟。 【篇二】关于戒烟的高一英语作文 　　Nowadays, more and more people realize the harm of smoking and the damage it bring to the people around us. Considered the health of people themseves and the one they care, many smokers try their best to give up smoking. When quiting smoking, I have some suggestions. First of all, people should have strong will on giving up smoking. Personal determination is the most important factor. When feeling eager to smoke, people should think about the damage of smoking and the people they love. And then they can strengthen their will not to smoke. 　　Secondly, sweep away all the cigarette around. They can"t find any cigarette when they want to smoke. And then after a while, their wants for smoke will reduce gradually. 　　Last but not least, prepare some candies in the pocket, when people want to smoke, eat candies instead. Hope every smoker succeed in the end. 【篇三】关于戒烟的高一英语作文 　　As we all know, there are many people smoking, although everyone knows smoking is harmful to us. Giving up smoking is not easy but addicted to it is quite easy, that"s why there are more and more people smoking. Smoking and passive smoking is risk factor that leads to various diseases. It has become world"s top 8 causes of death. More than 90% of lung cancer caused by smoking and lung cancer rates of smokers are 18 times over the non-smokers. Besides, smoking also causes angiocardiopathy, digestive system disease, oral disease and so on. In addition, passive smoking causes great concern in recent years. People have known that passive smoking also do great harm to human, too. Therefore, many countries and regions prohibit people from smoking in public zones, in order to reduce the harm of secondhand smoke. From my point of view, the best way to keep healthy is giving up smoke, for smoker"s own good as well as for others. 　　众所周知，即使人们都知道吸烟有害健康，但现在依然有很多人吸烟。吸烟容易戒烟难，这就是为什么烟民越来越多的原因。吸烟以及吸二手烟都是导致多种疾病的危险因子，烟草已经成为全球第八大死因。超过90%的肺癌是由吸烟导致的，吸烟者患肺癌的几率是非吸烟者的18倍之多。此外，吸烟也会导致心血管病、消化系统疾病、口腔疾病等。此外，吸二手烟在近些年也引起了人们很多的关注，它也会对人体造成危害。因此，为了减少二手烟伤害，许多国家和地区都禁止人们在公共场所吸烟。我认为，为了自己也为了他人的健康着想，保持健康的办法就是戒烟。 【篇四】关于戒烟的高一英语作文 　　It"s well known that smoking is bad for our health. It does much harm to our lung. Smoking too much is very easy to get cancer， which is very terrible. 　　Besides， smoking also do harm to people"s teeth. Those people always smoke will demage their teeth and their teeth are always yellow. That makes others feel sick. The last but not least， the people smoke the passive smoking are tend to get sick. They have do nothing wrong，but stand beside those smoking people. It"s unfair. 　　So， in order to the health of everyone， please stop smoking. 【篇五】关于戒烟的高一英语作文 　　Smoking is a widespread habit even among school children. The number of young smokers is increasing. 　　It is reported that over two-fifths of the students in a certain school smoke, and some of them even steal money to buy cigarettes, This is terrible. 　　As we all know, smoking is harmful to our health. But its even more harmful to middle school students for it does great harm not only to their health but also to their mind. 　　Middle school students are future builders of the country. They should spend their time learning what is useful. So its really time that these young smokers made up their minds to give up smoking.

NO Smoking Now, we can see the notice "No smoking" here and there. Whyuff1fBecause smoking is bad for our health. It can cause many kinds of disease, and even can lead to lung cancer. Every year, many people die of smoking. But many people begin to smoke. Once he smokes, he is used to it. It"s hard to stop smoking because the smokers are addicted to a drug called "nicotine". Though it"s very hard, I suggest they try their best to give it up. Smoking is not only bad for the smoker himself, but also for the people around. We should do something to help the smokers give up smoking.

Should Smoking in Public Places be Banned? 　　Nowadays many countries in the world have passed laws to ban smoking in public places. Some smokers claim that their rights are infringed if smoking is forbidden in public places. However, most non-smokers regard the ban as good news. As far as I"m concerned, smoking should be banned in all the public places such as restaurants, theaters and public squares.　　On the one hand, smoking is harmful both for smokers themselves and others. It is reported that every year smoking causes millions of death around the world. On the other hand, smoking pollutes the air. Just imagine that you sit in a restaurant full of smoke, how can you enjoy your meal there? Besides, smoking is bad for the elevation of a country"s image in the world.　　I believe if smoking is banned in all the public places, most of us will breathe in more fresh and clean air. And the health condition of all the people will be greatly improved.

smokingdoesgreatharmtoyourhealth.或smokingcausesgreatdamagetoyourhealth.

Smoking Is Harmful　　 At the class meeting our teacher read us a report in the newspaper. A certain student in a middle school smoked and he wouldn"t get rid of the bad habit though his teacherand friends warned him not to smoke any more. He even stole money to get cigarettes and was pat into prison in the end. This really gave usa shock. As we all　　 smoking is very harmful to our health. It does great harm not only to our health, but also to our mind, especially for us teenagers. Now more and more people all over the world have given up smoking or have made up their minds to do so, I think we middle school students are the future builders of our country. We should study hard and make progress every day. We should form good habits so that we can spend our time learning things useful and valuable for our motherland and people, I think today"s class meeting is very meaningful to my classmates who have a bad habit of smoking. (160 words)

It has been estimated that smokers have made up half of the population in China. And the smokers are becoming younger and younger, even ineluding some middle school students.Nowadays more and more people have realized smoking can do harm to people"shealth. However, some people still enjoy smoking. Why? Because some of them think it is a kind of fashion, some think it is of great fun and others, think that smoking can refresh themselves.In fact, smoking is a bad habit. It can cause a lot of diseases. Meanwhile smoking is a waste of money. Besides, careless smokers may cause dangerous fires.Smoking is harmful and it is not only bad for smokers themselves, but also bad for non-smokers.Therefore, I hope all the smokers can give up smoking for themselves and also for the people around them. 据估计，在中国吸烟者约占总人口的一半，而且烟民的年龄越来越年轻，甚至一些中学生也在抽烟。如今越来越多的人们已经认识到吸烟有害人体健康，但他们仍然乐此不疲。为什么?一些人认为抽烟是一种时髦，另外一些人认为抽烟很有趣，还有一些人认为吸烟可以提神。事实上，吸烟是一种不好的习惯，它能导致很多疾病。同时，吸烟很浪费金钱。除此而外，粗心的烟民还可能引起火灾。吸烟对人们的身体百害而无一利。它不仅有害吸烟者本人，而且对不吸烟者也会造成损害。因此，我希望吸烟者为自己和身边的人们而戒烟。It is said that there are about half of people in China are smoking.Many young boys and girls have the habit of smoking, though they are middle school students.As we all know, smoking does great harm to human beings. More and more people have come to realize how serious this problem is. But they are never bored with it. Some people think it is a kind of fashion, some think it is of great fun and others think that smoking can refresh themselves.Smoking causes many illnesses. A lot of people always cough because of smoking. The most serious illness caused by smoking is lung cancer. Meanwhile smoking is a waste of money. Besides, careless smokers may cause dangerous fires.In order to keep healthy, we should get rid of the bad habit of smoking. Please stop smoking at once.据说，中国有一半人在吸烟。许多男孩和女孩都有吸烟的习惯，尽管他们还是中学生。众所周知，吸烟对人身体是有害的。越来越多的人们认识到这个问题的严重性，但他们仍然乐此不疲。一些人认为抽烟是一种时髦，一些人认为抽烟很有趣，还有一些人认为吸烟可以提神。吸烟能导致很多疾病。由于吸烟，一些人一直在咳嗽。肺癌是吸烟导致的最严重的疾病。同时，吸烟很浪费金钱。除此而外，粗心的烟民还可能引起火灾。 为了保证人们的身体健康，我们应当改掉吸烟的坏习惯。请立即停止吸烟吧。

Smoking is prohibitedDO NOT SMOKING

吸烟有害健康，他会引发许多疾病，如心脏病,肺癌Smoking is harmful to health, it will lead to many diseases, such as heart disease,and lung cancer

1 If you don"t come to the office, I"ll go to your house and find out why you are not at work.选D I"ll go ;are not 2 You"ve agreed to go,so why aren"t you getting ready? But I haven"t realise that you want me to start at once.选B haven"t realized ,want3 Having reched his journey"s end, Carl hoped to find a hotel to stay the night.选C to stay D to past4 Smoking is harmful to health is a fact many smokers choose to ignore.选D Smoking is harmful to health5 It can be said that it pays to invest more in education and scientific research.选A pays6 This pair of trousers isn"t good, and that pair is hardly better.选D hardly7 The secretary was asked to get rid of the waste paper on the desk.选A get rid of

Smoking does great harm to teenagers" health

harmfulto。beharmful后面加to，意思是，有害例句：Smokingisharmfultohealth.吸烟有害身体健康。一、重点词汇解析harmful，读音英[hɑ_mf_l-f(_)l]，美["hɑrmf_l]adj，有害的，能造成损害的例，Theyareallha。

AgNO3。根据查询化学网可知，硝酸银溶液外文名Silvernitrate化学式AgNO3硝酸银，是一种无机化合物，化学式为AgNO3，为白色结晶性粉末，易溶于水、氨水、甘油，微溶于乙醇。

乙醛的催化氧化反应原理：传统乙醛氧化制乙酸法，是以溶解的醋酸钴、醋酸铜或醋酸锰(一般为0.1%)为催化剂，在50～80℃、0.6～0.8MPa下，将醋酸溶液中所含5%～15%的乙醛进行空气或氧气液相氧化反应。一般认为，在乙醛氧化反应中，首先是乙醛与空气(或氧气)氧化成过氧乙酸，过氧乙酸很不稳定，在醋酸锰或醋酸铜、醋酸钴等金属盐催化下发生分解，同时使另一分子的乙醛氧化，生成两分子乙酸。该氧化反应是放热反应。乙醛氧化制醋酸的反应机理，一般认为可用自由基的链接反应机理来进行解释。常温下乙醛就可以自动地以很慢的速度吸收空气中的氧而被氧化生成过氧乙酸。自由基引发一系列的反应生成醋酸。反应过程中，过氧乙酸是一个极不安定的爆炸性化合物，积累到一定浓度就会瞬间分解而引起爆炸。因此，防止因过氧乙酸的积累而引起的爆炸，是乙醛氧化法制乙酸工艺的关键之一。醋酸锰催化剂的主要作用：将乙醛氧化时生成的过氧乙酸及时分解成乙酸，而防止过氧乙酸的积累。扩展资料制乙醛的反应：1、工业制乙醛方程式： 2CHu2083CHu2082OH+Ou2082→ 2CHu2083CHO+2Hu2082O（加热，催化剂Cu/Ag)2、乙炔水化法：Cu2082Hu2082+Hu2082O→CHu2083CHO（催化剂，加热）（是加成反应，也是还原反应）3、乙烯氧化法：2CHu2082=CHu2082+Ou2082→2CHu2083CHO（催化剂，加热，加压）4、乙醛催化氧化：2CHu2083CHO+Ou2082 →2CHu2083COOH（催化剂，加热）参考资料来源：百度百科-乙醛

硝酸银和稀盐酸反应生成白色沉淀。硝酸银的化学式为AgNO3，它是一种无色透明晶体，易溶于水。纯度不高的硝酸银对光的稳定性不强，需要保存在棕色试剂瓶中。稀盐酸的化学式为HCl，它是一种呈酸性的无色澄清液体，有刺激性气味，需要密封保存。硝酸银和稀盐酸反应时，生成氯化银沉淀和硝酸。硫酸与硝酸钡反应生成硫酸钡沉淀。

znso4是硫酸锌的化学名称。白色流动性粉末，密度3.28g/cm3。溶于水。微溶于醇。在空气中极易潮解。由氧化锌或氢氧化锌和硫酸反应制得。用作其他锌盐的生产原料；用于电缆镀锌和电解制取纯锌，果树苗圃病害喷洒剂，人造纤维、木材和皮革保存剂。化学式为ZnSO4，无色或白色晶体、颗粒或粉末，无气味。熔点为100℃，味涩。密度为1.957g/cm3（25℃）。易溶于水，水溶液呈酸性，微溶于乙醇和甘油。注意事项操作：密闭操作，局部排风。防止粉尘释放到车间空气中。操作人员必须经过专门培训，严格遵守操作规程。建议操作人员佩戴自吸过滤式防尘口罩，戴化学安全防护眼镜，穿橡胶耐酸碱服，戴橡胶耐酸碱手套。储存：储存于阴凉、通风的库房。远离火种、热源。防止阳光直射。包装密封。应与氧化剂分开存放，切忌混储。储区应备有合适的材料收容泄漏物。运输：起运时包装要完整，装载应稳妥。运输过程中要确保容器不泄漏、不倒塌、不坠落、不损坏。严禁与氧化剂、食用化学品等混装混运。运输途中应防曝晒、雨淋，防高温。车辆运输完毕应进行彻底清扫。公路运输时要按规定路线行驶。以上内容参考：百度百科—硫酸锌

1、传统乙醛氧化制乙酸法，是以溶解的醋酸钴、醋酸铜或醋酸锰(一般为0.1%)为催化剂，在50～80℃、0.6～0.8MPa下，将醋酸溶液中所含5%～15%的乙醛进行空气或氧气液相氧化反应。 2、一般认为，在乙醛氧化反应中，首先是乙醛与空气(或氧气)氧化成过氧乙酸，过氧乙酸很不稳定，在醋酸锰或醋酸铜、醋酸钴等金属盐催化下发生分解，同时使另一分子的乙醛氧化，生成两分子乙酸。该氧化反应是放热反应。 3、乙醛氧化制醋酸的反应机理，一般认为可用自由基的链接反应机理来进行解释。常温下乙醛就可以自动地以很慢的速度吸收空气中的氧而被氧化生成过氧乙酸。

我认为是氧化反应

Na2CO3+2AgNO3＝2NaNO3+Ag2CO3↓

ZnSO4是硫酸锌的化学式。它所表示的意义分宏观和微观两个方面。宏观上表示硫酸锌这种物质。表示硫酸锌这种物质是由锌元素，硫元素和氧元素组成的。微观上表示一个硫酸锌分子。表示一个硫酸锌分子是由1个锌原子，1个硫原子和4个氧原子构成的。

分类: 教育/科学 >> 升学入学 >> 中考 问题描述: 例 可溶性等 解析: 硫酸锌 ZnSO4 性质:无色晶体,小针状或粒状晶形粉未,无臭,涩的,金属味道,在空气中会风化。溶液对石蕊呈酸性比重1.957(25/4℃),熔点100℃在280℃失去7H2O,溶于水及甘油,不溶于酒精,毒性底。 用途:人造丝制造,食品补充,动物饲料,媒染剂,木材防腐剂,分析试药。带七分子结晶水的硫酸锌（ZnSO4·7H2O）是无色的晶体，俗称皓矾。硫酸锌在医疗上用作收敛剂，它可使有机体组织收缩，减少腺体的分泌。硫酸锌还可作为木材的防腐剂，用硫酸锌溶液浸泡过的枕木，可延长使用时间。在印染工业上用硫酸锌作媒染剂，能使染料固着于纤维上。硫酸锌还可用于制造白色颜料（锌钡白等）。 其他用途: 1.医用硫酸锌. 【别名】皓矾，锌矾，Zinc Sulphate。 (硫酸锌在医疗上可以用作收敛剂。) 2.工业用硫酸锌 外观:白色或微带黄色结晶或粉末 性能:本品为白色粉末或针状晶体,易溶于水,不溶于乙醇及酮,在空气中逐渐风化。 用途: 硫酸锌用途广泛主要用于人造纤维、电解工业、电镀、无机颜料、饲料、农药中的针强化剂,化肥等。 3.饲料级硫酸锌 标 准 号： NY 44—1987 代替标准号： GB 8251—1987 类 型： 畜牧兽医 所属类别： 畜禽饲料与添加剂 年 度： 1987 4.农业级硫酸锌 外观:白色结晶或粉末 用途:在饲料加工中作锌的补充剂 5.食品级硫酸锌 制取方法: 1. 实验室常把金属锌置于稀硫酸中,在生成氢气的同时,也生成了硫酸锌.由于硫酸锌能溶于水,形成硫酸锌溶液,所以反应结束后,用蒸发皿来加热蒸发反应结束后的液体,就能看到白色的硫酸锌固体. 2. 利用钛白粉废液与菱锌矿（或锌焙砂）生产硫酸锌（新工艺） 3. 锌矿全湿法制取硫酸锌

是氧化反应乙酸又名醋酸主反应：乙醛+氧气→反应：①主反应：乙醛+氧气→乙酸副反应：氧化、酯化生成甲酸、醋酸甲酯

能生成硫酸锌的化学方程式有哪些 Zn+H2SO4===ZnSO4+H2 ZnCO3+H2SO4====ZnSO4+CO2+H2O ZnCl2+H2SO4====(加热)2HCL+ZnSO4 Zn+FeSO4====ZnSO4+FeZn+CuSO4====ZnSO4+Cu ZnO+H2SO4===ZnSO4+H2O Zn(OH)2+H2SO4====ZnSO4+2H2O ZnSO4·2H2O（皓矾）===（加热）ZnSO4+2H2O 望采纳！ 稀硫酸，硫酸锌的化学式怎么写 硫酸 ，H2SO4，硫酸锌是ZnSO4 稀硫酸是混合物，没有化学式； 其中的溶质是H2SO4,硫酸 1.锌和稀硫酸 2.氧化锌和稀硫酸 3.锌和硫酸亚铁 4.硫酸银溶液和氯化锌溶液（一般不用） 5.氢氧化锌和稀硫酸 6.碳酸锌和稀硫酸 用六种方法配制硫酸锌化学式 1.锌和稀硫酸 2.氧化锌和稀硫酸 3.锌和硫酸亚铁 4.硫酸银溶液和氯化锌溶液（一般不用） 5.氢氧化锌和稀硫酸 6.碳酸锌和稀硫酸 暂时先这些吧

乙醛的催化氧化反应原理：工业制乙醛方程式： 2CHu2083CHu2082OH+Ou2082→ 2CHu2083CHO+2Hu2082O（加热，催化剂Cu/Ag)乙炔水化法：Cu2082Hu2082+Hu2082O→CHu2083CHO（催化剂，加热）（是加成反应，也是还原反应）乙烯氧化法：2CHu2082=CHu2082+Ou2082→2CHu2083CHO（催化剂，加热，加压）乙醛催化氧化：2CHu2083CHO+Ou2082 →2CHu2083COOH（催化剂，加热）扩展资料：乙醛要用耐压玻璃瓶或金属桶盛装。容器须存放在有冷气设备，通风良好，用不燃材料结构的库房内，要远离火种和热源，防止阳光直射。应与氧化剂、强碱、氨、胺类、卤素、醇+酮、酚等物质，以及遇水燃烧的物质分隔存放。包装必须坚固密封，不宜久存。搬运要轻放轻卸。灭火可用雾状水、干粉、抗醇泡沫、二氧化碳、干砂。泄漏出物料时。首先要切断火源，进行通风，用水冲洗。经稀释的洗水放入废水系统。处理原则：（1）吸入中毒者应迅速脱离现场。必要时吸氧，雾化吸入，2%碳酸氢钠、地塞米松等。给予止咳、解痉药。早期给地塞米松10mg静脉推注。出现肺炎或肺水肿时应及早对症处理。（2）误服后尽快以清水洗胃，洗胃后可给予3%碳酸铵或15%醋酸铵100ml，并口服牛奶或豆浆，以保护胃黏膜。（3）皮肤和黏膜接触后，先用大量清水冲洗，再用肥皂水或2%碳酸氢钠液冲洗，更换被污染衣服。（4）过敏者可给予抗过敏药。参考资料来源：百度百科——乙醛

不知道你想知道的是通式还是什么？

硫酸锌是一种无机物，化学式为ZnSO4。可通过锌与稀硫酸反应制得，化学反应方程式如下：Zn+H2SO4=ZnSO4+H2↑

Zn+2AgNO3=2Ag+Zn（NO3）2

乙醛的催化氧化反应原理：工业制乙醛方程式： 2CHu2083CHu2082OH+Ou2082→ 2CHu2083CHO+2Hu2082O（加热，催化剂Cu/Ag)乙炔水化法：Cu2082Hu2082+Hu2082O→CHu2083CHO（催化剂，加热）（是加成反应，也是还原反应）乙烯氧化法：2CHu2082=CHu2082+Ou2082→2CHu2083CHO（催化剂，加热，加压）乙醛催化氧化：2CHu2083CHO+Ou2082 →2CHu2083COOH（催化剂，加热）扩展资料：乙醛要用耐压玻璃瓶或金属桶盛装。容器须存放在有冷气设备，通风良好，用不燃材料结构的库房内，要远离火种和热源，防止阳光直射。应与氧化剂、强碱、氨、胺类、卤素、醇+酮、酚等物质，以及遇水燃烧的物质分隔存放。包装必须坚固密封，不宜久存。搬运要轻放轻卸。灭火可用雾状水、干粉、抗醇泡沫、二氧化碳、干砂。泄漏出物料时。首先要切断火源，进行通风，用水冲洗。经稀释的洗水放入废水系统。处理原则：（1）吸入中毒者应迅速脱离现场。必要时吸氧，雾化吸入，2%碳酸氢钠、地塞米松等。给予止咳、解痉药。早期给地塞米松10mg静脉推注。出现肺炎或肺水肿时应及早对症处理。（2）误服后尽快以清水洗胃，洗胃后可给予3%碳酸铵或15%醋酸铵100ml，并口服牛奶或豆浆，以保护胃黏膜。（3）皮肤和黏膜接触后，先用大量清水冲洗，再用肥皂水或2%碳酸氢钠液冲洗，更换被污染衣服。（4）过敏者可给予抗过敏药。参考资料来源：百度百科——乙醛

乙醛的催化氧化反应原理：传统乙醛氧化制乙酸法，是以溶解的醋酸钴、醋酸铜或醋酸锰(一般为0.1%)为催化剂，在50～80℃、0.6～0.8MPa下，将醋酸溶液中所含5%～15%的乙醛进行空气或氧气液相氧化反应。一般认为，在乙醛氧化反应中，首先是乙醛与空气(或氧气)氧化成过氧乙酸，过氧乙酸很不稳定，在醋酸锰或醋酸铜、醋酸钴等金属盐催化下发生分解，同时使另一分子的乙醛氧化，生成两分子乙酸。该氧化反应是放热反应。乙醛氧化制醋酸的反应机理，一般认为可用自由基的链接反应机理来进行解释。常温下乙醛就可以自动地以很慢的速度吸收空气中的氧而被氧化生成过氧乙酸。自由基引发一系列的反应生成醋酸。反应过程中，过氧乙酸是一个极不安定的爆炸性化合物，积累到一定浓度就会瞬间分解而引起爆炸。因此，防止因过氧乙酸的积累而引起的爆炸，是乙醛氧化法制乙酸工艺的关键之一。醋酸锰催化剂的主要作用：将乙醛氧化时生成的过氧乙酸及时分解成乙酸，而防止过氧乙酸的积累。扩展资料制乙醛的反应：1、工业制乙醛方程式： 2CHu2083CHu2082OH+Ou2082→ 2CHu2083CHO+2Hu2082O（加热，催化剂Cu/Ag)2、乙炔水化法：Cu2082Hu2082+Hu2082O→CHu2083CHO（催化剂，加热）（是加成反应，也是还原反应）3、乙烯氧化法：2CHu2082=CHu2082+Ou2082→2CHu2083CHO（催化剂，加热，加压）4、乙醛催化氧化：2CHu2083CHO+Ou2082 →2CHu2083COOH（催化剂，加热）参考资料来源：百度百科-乙醛

乙醛的催化氧化反应原理：传统乙醛氧化制乙酸法，是以溶解的醋酸钴、醋酸铜或醋酸锰(一般为0.1%)为催化剂，在50～80℃、0.6～0.8MPa下，将醋酸溶液中所含5%～15%的乙醛进行空气或氧气液相氧化反应。一般认为，在乙醛氧化反应中，首先是乙醛与空气(或氧气)氧化成过氧乙酸，过氧乙酸很不稳定，在醋酸锰或醋酸铜、醋酸钴等金属盐催化下发生分解，同时使另一分子的乙醛氧化，生成两分子乙酸。该氧化反应是放热反应。乙醛氧化制醋酸的反应机理，一般认为可用自由基的链接反应机理来进行解释。常温下乙醛就可以自动地以很慢的速度吸收空气中的氧而被氧化生成过氧乙酸。自由基引发一系列的反应生成醋酸。反应过程中，过氧乙酸是一个极不安定的爆炸性化合物，积累到一定浓度就会瞬间分解而引起爆炸。因此，防止因过氧乙酸的积累而引起的爆炸，是乙醛氧化法制乙酸工艺的关键之一。醋酸锰催化剂的主要作用：将乙醛氧化时生成的过氧乙酸及时分解成乙酸，而防止过氧乙酸的积累。扩展资料制乙醛的反应：1、工业制乙醛方程式： 2CHu2083CHu2082OH+Ou2082→ 2CHu2083CHO+2Hu2082O（加热，催化剂Cu/Ag)2、乙炔水化法：Cu2082Hu2082+Hu2082O→CHu2083CHO（催化剂，加热）（是加成反应，也是还原反应）3、乙烯氧化法：2CHu2082=CHu2082+Ou2082→2CHu2083CHO（催化剂，加热，加压）4、乙醛催化氧化：2CHu2083CHO+Ou2082 →2CHu2083COOH（催化剂，加热）参考资料来源：百度百科-乙醛

碳酸钾 KCO3碳酸钠 Na(Co)3碳酸钙 CaCo3碳酸镁 MgCo3碳酸锌 ZnCo3碳酸钡 BeCo3 注：3是右下角的哦 学化学应该都知道

乙醛的催化氧化反应原理：传统乙醛氧化制乙酸法，是以溶解的醋酸钴、醋酸铜或醋酸锰(一般为0.1%)为催化剂，在50～80℃、0.6～0.8MPa下，将醋酸溶液中所含5%～15%的乙醛进行空气或氧气液相氧化反应。一般认为，在乙醛氧化反应中，首先是乙醛与空气(或氧气)氧化成过氧乙酸，过氧乙酸很不稳定，在醋酸锰或醋酸铜、醋酸钴等金属盐催化下发生分解，同时使另一分子的乙醛氧化，生成两分子乙酸。该氧化反应是放热反应。乙醛氧化制醋酸的反应机理，一般认为可用自由基的链接反应机理来进行解释。常温下乙醛就可以自动地以很慢的速度吸收空气中的氧而被氧化生成过氧乙酸。自由基引发一系列的反应生成醋酸。反应过程中，过氧乙酸是一个极不安定的爆炸性化合物，积累到一定浓度就会瞬间分解而引起爆炸。因此，防止因过氧乙酸的积累而引起的爆炸，是乙醛氧化法制乙酸工艺的关键之一。醋酸锰催化剂的主要作用：将乙醛氧化时生成的过氧乙酸及时分解成乙酸，而防止过氧乙酸的积累。扩展资料制乙醛的反应：1、工业制乙醛方程式： 2CHu2083CHu2082OH+Ou2082→ 2CHu2083CHO+2Hu2082O（加热，催化剂Cu/Ag)2、乙炔水化法：Cu2082Hu2082+Hu2082O→CHu2083CHO（催化剂，加热）（是加成反应，也是还原反应）3、乙烯氧化法：2CHu2082=CHu2082+Ou2082→2CHu2083CHO（催化剂，加热，加压）4、乙醛催化氧化：2CHu2083CHO+Ou2082 →2CHu2083COOH（催化剂，加热）参考资料来源：百度百科-乙醛

1、传统乙醛氧化制乙酸法，是以溶解的醋酸钴、醋酸铜或醋酸锰(一般为0.1%)为催化剂，在50～80℃、0.6～0.8MPa下，将醋酸溶液中所含5%～15%的乙醛进行空气或氧气液相氧化反应。 2、一般认为，在乙醛氧化反应中，首先是乙醛与空气(或氧气)氧化成过氧乙酸，过氧乙酸很不稳定，在醋酸锰或醋酸铜、醋酸钴等金属盐催化下发生分解，同时使另一分子的乙醛氧化，生成两分子乙酸。该氧化反应是放热反应。 3、乙醛氧化制醋酸的反应机理，一般认为可用自由基的链接反应机理来进行解释。常温下乙醛就可以自动地以很慢的速度吸收空气中的氧而被氧化生成过氧乙酸。

乙醛的催化氧化反应原理：工业制乙醛方程式： 2CHu2083CHu2082OH+Ou2082→ 2CHu2083CHO+2Hu2082O（加热，催化剂Cu/Ag)乙炔水化法：Cu2082Hu2082+Hu2082O→CHu2083CHO（催化剂，加热）（是加成反应，也是还原反应）乙烯氧化法：2CHu2082=CHu2082+Ou2082→2CHu2083CHO（催化剂，加热，加压）乙醛催化氧化：2CHu2083CHO+Ou2082 →2CHu2083COOH（催化剂，加热）扩展资料：乙醛要用耐压玻璃瓶或金属桶盛装。容器须存放在有冷气设备，通风良好，用不燃材料结构的库房内，要远离火种和热源，防止阳光直射。应与氧化剂、强碱、氨、胺类、卤素、醇+酮、酚等物质，以及遇水燃烧的物质分隔存放。包装必须坚固密封，不宜久存。搬运要轻放轻卸。灭火可用雾状水、干粉、抗醇泡沫、二氧化碳、干砂。泄漏出物料时。首先要切断火源，进行通风，用水冲洗。经稀释的洗水放入废水系统。处理原则：（1）吸入中毒者应迅速脱离现场。必要时吸氧，雾化吸入，2%碳酸氢钠、地塞米松等。给予止咳、解痉药。早期给地塞米松10mg静脉推注。出现肺炎或肺水肿时应及早对症处理。（2）误服后尽快以清水洗胃，洗胃后可给予3%碳酸铵或15%醋酸铵100ml，并口服牛奶或豆浆，以保护胃黏膜。（3）皮肤和黏膜接触后，先用大量清水冲洗，再用肥皂水或2%碳酸氢钠液冲洗，更换被污染衣服。（4）过敏者可给予抗过敏药。参考资料来源：百度百科——乙醛

　　1、传统乙醛氧化制乙酸法，是以溶解的醋酸钴、醋酸铜或醋酸锰(一般为0.1%)为催化剂，在50～80℃、0.6～0.8MPa下，将醋酸溶液中所含5%～15%的乙醛进行空气或氧气液相氧化反应。 　　2、一般认为，在乙醛氧化反应中，首先是乙醛与空气(或氧气)氧化成过氧乙酸，过氧乙酸很不稳定，在醋酸锰或醋酸铜、醋酸钴等金属盐催化下发生分解，同时使另一分子的乙醛氧化，生成两分子乙酸。该氧化反应是放热反应。 　　3、乙醛氧化制醋酸的反应机理，一般认为可用自由基的链接反应机理来进行解释。常温下乙醛就可以自动地以很慢的速度吸收空气中的氧而被氧化生成过氧乙酸。

溶解时吸热

氧化铝中铝元素显+3价，氧元素显-2价，其化学式为Al2O3．MgCl2从右向左读作氯化镁．硫化氢中氢元素显+1价，硫元素显-2价，其化学式为H2S．氢氧化钠中氢元素显+1价，氢氧根显-1价，其化学式为NaOH．碳酸钠中钠元素显+1价，碳酸根显-2价，其化学式为Na2CO3．硫酸钡中钡元素显+2价，硫酸根显-2价，其化学式为BaSO4．硝酸银中银元素显+1价，硝酸根显-1价，其化学式为AgNO3．故答案为： 名称 氧化铝 氯化镁 硫化氢 氢氧化钠 碳酸钠 硫酸钡 硝酸银 化学式 Al2O3 MgCl2 H2S NaOH Na2CO3 BaSO4 AgNO3

乙醛的催化氧化反应原理：传统乙醛氧化制乙酸法，是以溶解的醋酸钴、醋酸铜或醋酸锰(一般为0.1%)为催化剂，在50～80℃、0.6～0.8MPa下，将醋酸溶液中所含5%～15%的乙醛进行空气或氧气液相氧化反应。一般认为，在乙醛氧化反应中，首先是乙醛与空气(或氧气)氧化成过氧乙酸，过氧乙酸很不稳定，在醋酸锰或醋酸铜、醋酸钴等金属盐催化下发生分解，同时使另一分子的乙醛氧化，生成两分子乙酸。该氧化反应是放热反应。乙醛氧化制醋酸的反应机理，一般认为可用自由基的链接反应机理来进行解释。常温下乙醛就可以自动地以很慢的速度吸收空气中的氧而被氧化生成过氧乙酸。自由基引发一系列的反应生成醋酸。反应过程中，过氧乙酸是一个极不安定的爆炸性化合物，积累到一定浓度就会瞬间分解而引起爆炸。因此，防止因过氧乙酸的积累而引起的爆炸，是乙醛氧化法制乙酸工艺的关键之一。醋酸锰催化剂的主要作用：将乙醛氧化时生成的过氧乙酸及时分解成乙酸，而防止过氧乙酸的积累。扩展资料制乙醛的反应：1、工业制乙醛方程式： 2CHu2083CHu2082OH+Ou2082→ 2CHu2083CHO+2Hu2082O（加热，催化剂Cu/Ag)2、乙炔水化法：Cu2082Hu2082+Hu2082O→CHu2083CHO（催化剂，加热）（是加成反应，也是还原反应）3、乙烯氧化法：2CHu2082=CHu2082+Ou2082→2CHu2083CHO（催化剂，加热，加压）4、乙醛催化氧化：2CHu2083CHO+Ou2082 →2CHu2083COOH（催化剂，加热）参考资料来源：百度百科-乙醛

3Ag + 4HNO3（稀） == 3AgNO3 + NO↑+ 2H2O 化学式AgNO3