The environment is everything around us,for example,air,water,animals,plants,buildings and so on.They all affect us in many ways and closely related to our lives.People can't live without the environment.Everybody needs to breathe air,drink water and eat food every day.We burn coal to keep warm,and we use wood to make paper.As a result,we bee the part of the environment.
The environment has been getting wores and wores for many years.
采用微波法以蔗糖为原料，浓盐酸为催化剂和酸化剂，经中间产物5-羟甲基糠醛，再脱羧生成产物乙酰丙酸和副产物甲酸。
实验结果表明，在盐酸浓度为4mol/L，蔗糖浓度为50g/L，反应时间5min，微波功率为70%的条件下可以达到乙酰丙酸的最大产率52.4%。
较文献值产率22.4%有明显提高。
Based on the microwave method with using sucroses as raw materials and concentrated hydrochloric acid as catalyst and acidifier,a product of levulinic acid and formic acid by-products are generated by the intermediate product 5 - hydroxymethyl-furfural and decarboxylation. The experimental results have shown under the condition that the concentration of hydrochloric acid being 4mol/L, the concentration of sucrose being 50g/L and 70% of the microwave power being used with a five-minute reaction time, the most maximum acid production can be reached at the rate of 52.4%. It is obviously improved pared with the rate 22.4% on the literature value.
In reaction to the phenomenon of potassium water experimental *** ysisExplore the phenomenon of potassium reaction with water. Experiment proves, in the open system, potassium reaction with water and bustion, burning essence is the hydrogen potassium and reaction in air bustion. In kerosene, potassium and water protection not only reaction.
由于有字典的帮忙，使我写一篇简单的作文，没有问题。
今天的日常生活在五十年前是不敢想，毫无疑问化学在其中起到了难以磨灭的作用，那么，同样的，未来的生活中化学会怎样的改变我的生活呢，会不会有一种穿在身上冬暖夏凉的衣服呢 会不会不用吃天然的肉，改吃人造的肉呢，会不会天然的屋子具有生态系统 会不会汽车变成以水为燃料呢？ 我接触化学这门学科也有时日然而谁能聪明到可以预言在可预见的未来，化学将会怎样更彻底的改变我们的生活呢。
50 years ago, You could hardly imagine any of the today's life It is no definitly that chemics has already changed our life every inch.I can't help but ask myself Wether is it What will have to happen in the future days that chemics entirely changed the our custom or not. Wether is it there being a kind of clothing wich keep cools in the summer and warms in the winter,or we eating meat produced artificially rather than by a natural process as dinner,or we having the living room with a healthy ecosystem.And what most probably,our vehicle would burn water merely. It's not a short time that I 've learned chemics as my major.Nevertheless who got a cute vision to predicte that in the near future how will the chemics pletely change my life .
Dear Mr. Vice-Chancellor: Hello! I am a XX year XX Chemical College graduates, graduating in a time when all I have to do a good job of preparation, there is sufficient confidence and capacity to engage in teaching and research work in chemistry. Sincerely hope that your school can teach, in effect you are under. Comparison of the character I cheerful, straightforward man, peace love love love爱闹laugh, but able to get things done in a serious sense of responsibility, and thinking more active, with a strong sense of innovation and capabilities. While studying at the school, majoring in chemistry and chemical with the curriculum and teaching-related experiments, the optional education, psychology, philosophy, the legal basis for such courses, a serious effort to learn, excellent results. Teaching practice, the active-depth classes, the careful study of teaching, with an open mind to seek division, made rapid progress in education by teachers and students alike, outstanding internship performance. I am quite confident that their abilities, he directed and starred piece ＂youthful dream to fly,＂ drama ＂Memory of Youth＂, also anized dance with my clas *** ates had a rehearsal ＂happy home＂, ＂Chashan love＂, ＂Hongmei Chan, ＂and so on, also participated in dance petitions like school performance; I actively participate in school activities association training, also own the＂ Changchun Evening News ＂part-time clerk, in-depth munity, the feelings of a lot; St. Paul, I have to create ＂dusty studio,＂ Contact tutor for students to work to taste the hardships of the pioneering joy and success. After I contacted by phone to Zhejiang Pinghu internship, during the visit of the Soviet Union, hang o states, after Beijing, Shanghai, Dalian stop when they are, a simple march-site inspection, as a graduate to choose a reference direction. I am a brave people who dare to do, like at the moment, I think of their own future, are also doing their own efforts. Make a good teacher is what I have been ideal; I have high education is people-oriented, individualized education. Education, teachers, schools should be a service for students. For all students, for students of all, I would like to use my life energy, carefully nurtured garden peach! Finally, thank you for your busy schedule to read my自荐信， but also hope to have the opportunity to personally thank you!
对应的英语：My chemistry teacher is a young lady. She is attractive. We all, partically for those male teenagers, like having her lessons, and appreciates her chemical knowledge and experimental skills. She is nice and kind to us except that we make her to anger such as someone plays mobile phone in her class. She is the teacher who is in charge of our class. So we all work hard to make sure that she won't be disappointed at our exams.
Chemical class is the pulsory course in the middle school.It isone of my favorable classes.When I first contact with this subject,I aminterested in it.In my mind,it is miracle.It can see the nature of object.For example,through chemical class,I learn how does water form.Knowing this makes me feel like a little talent.I have a great sense of achievement.Maybe it is my curiosity makes me like this class so much.To be honest,to explore knowledge is very excited and interesting.
如果学文的话，主三门一定要好，历政地都拉不开太大差距，但是数学好很提分……如果学理的话，就要求你必须面面俱到了，英语是拉开差距的科目…… 不管学文学理，重要是看自己的爱好以及未来的志愿和理想……不管学什么，主三门一定要好希望你选择正确……
乡村的四季，美如画.春，夏，秋，冬，都是一幅幅迷人的画卷.春季，光秃秃的草木，又长出了嫩芽.它们在春雨中生长起来.这时，花儿绽开了柔嫩的小脸，遍野都是望不到边的绿海，衬托着红的，白的，黄的……小花，把草地染成五颜六色的，一阵微风吹来，浓郁的花味飘远了.春季飞一般地离开人间，乡村马上迎来了烈日炎炎的夏天.初夏，乡村的原野既是活跃的，又是美丽的.天上的白云悠闲地飘着，广阔的大地上三三两两的农民伯伯扛着锄头，辛勤地劳动着.柔嫩的柳丝低着头，像是为辛勤的农民遮住烈日的炎热.火热的夏天带来了秋姐姐，迎面送来的秋风，让乡村的人心旷神怡.秋风把田野刮成了金黄的.稠密的大豆子，老远望去一片土黄色.每户人家门口，还挂着成熟的辣椒.白色的小野菊顽强地从草地里探出头来，在秋风下微微抖动身子.秋去冬来，冬爷爷把村子金黄的树叶盖上了雪白的棉被，给屋顶戴上了白色帽子.也给了连绵起伏的山，铺上了一层厚厚的大被子.
摘要：一1,2环氧化物水在各种Thiolysis30 ° C和pH值7.0的强烈加速氯化锌（10摩尔%）除非氨基酸和carboxythiophenol使用。
该水相介质及催化剂的回收和再利用在各种运行而不会影响该过程的效率。
介绍该A - hydroxysulfide单位目前的化合物生物及药理interest1，是通用基团合成烯丙醇，benzoxathiepines,benzotiazepines，的R - thioketones，研究取代R是不饱和enones，和A - hydroxysulfoxides使用在天然化合物的合成。
最简单的访问，hydroxysulfides是thiolysis1,2，也就是通常进行了环氧有机溶剂（四氢呋喃，二氯甲烷，甲醇，乙腈，或心理健康热线）通过使用硫醇在碱性conditions8或存在的助剂和/或催化剂
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