中考英语作文How to learn English well说课讲解.doc

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1、精品好文档，推荐学习交流HowtolearnEnglishFirstly,onewhowantstolearnEnglishwellmustbefondofit.Asthesayinggoes,"Agoodinterestishalfofthesuccess."Secondly,youhavetoworkhardandalwayskeepagoodstateofmind.Onecanneverreachthetopofmountainwithoutahardprocessandenoughpractice,sodoEnglishlearners.R

2、emembernevertobedisappointedwhenyougotlowmarksorevendidnotpasstheexams.Asalearnerespeciallyabeginner,toexperiencefailureisnotstrange.Thirdly,youmuststicktowhatyouarelearningorhavelearned.Youhavetolookatthewordsfromtimetotimebyheart,recitethetextsagainandagain.Youshouldhaveapro

3、perarrangement,oryoumaylearnitforalongtimewithoutrestandthenleaveitalonealsoforalongtime.Bydoingso,thetimeyouhavespentlearningisnearlyawaste.theseabovearemymainwaysoflearningandIhavereceivedsomegoodeffects.Ifyouthinktheyarealsosuitableforyou,youcanjusthaveatrytofollowme.与氧有关的化

4、学方程式：2Mg+O22MgO现象：燃烧、放出大量的热、同时放出耀眼的白光S+O2SO2现象：空气中是淡蓝色的火焰；纯氧中是蓝紫色的火焰；同时生成有刺激性气味的气体。C+O2CO2现象：生成能够让澄清石灰水浑浊的气体2C+O22CO现象：燃烧4P+5O22P2O5现象:：生成白烟3Fe+2O2Fe3O4现象：剧烈燃烧、火星四射、生成黑色的固体2H2+O22H2O现象：淡蓝色的火焰2H2O22H2O+O2↑现象：溶液里冒出大量的气泡2HgO2Hg+O2↑现象：生成银白色的液体金属2KClO32KCl+3O2↑现象：生成能让带火星的木条复燃的气体2KM

5、nO4K2MnO4+MnO2+O2↑现象：同上，跟氢有关的化学方程式：2H2+O22H2O现象：淡蓝色的火焰Zn+H2SO4==ZnSO4+H2↑现象：有可燃烧的气体生成仅供学习与交流，如有侵权请联系网站删除谢谢2精品好文档，推荐学习交流Mg+H2SO4==MgSO4+H2↑现象：同上Fe+H2SO4==FeSO4+H2↑现象：变成浅绿色的溶液，同时放出气体2Al+3H2SO4==Al2(SO4)3+3H2↑现象：有气体生成Zn+2HCl==ZnCl2+H2↑现象：同上仅供学习与交流，如有侵权请联系网站删除谢谢2