有关化学的英文题目(中英文回答都可以)1.If you started with 100 grams of a substance having a half-life of 2.5 hours,how much of the original substance would remain after 5 hours?7.5 hours?2.If a radioactive substance has an extremely

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有关化学的英文题目(中英文回答都可以)1.If you started with 100 grams of a substance having a half-life of 2.5 hours,how much of the original substance would remain after 5 hours?7.5 hours?2.If a radioactive substance has an extremely
有关化学的英文题目(中英文回答都可以)
1.If you started with 100 grams of a substance having a half-life of 2.5 hours,how much of the original substance would remain after 5 hours?7.5 hours?
2.If a radioactive substance has an extremely long half-life,would you expect its activity to be hogh or low?

有关化学的英文题目(中英文回答都可以)1.If you started with 100 grams of a substance having a half-life of 2.5 hours,how much of the original substance would remain after 5 hours?7.5 hours?2.If a radioactive substance has an extremely
1.半衰期问题.100g原物质,半衰期2.5h,5小时后就是100g*(1/2)^(5/2.5)=25g,7.5h后就是100g*(1/2)^(7.5/2.5)=12.5g
2.如果放射性物质有很长的半衰期,说明相对稳定,相应的活性就会比较低

有关化学的英文题目(中英文回答都可以)1.If you started with 100 grams of a substance having a half-life of 2.5 hours,how much of the original substance would remain after 5 hours?7.5 hours?2.If a radioactive substance has an extremely 有关诚信的英文名言警句最好中英文都有,最好超过20个,不过少点也可以. 以英文为母语的国家风土人情中英文都可以急求一篇有关汽车的英文文献,2W字符,中英文都要的! 有关汽车的中英文对照的文章,英文要一万个字符好的话可以再加分谁知道有关动物的英语谚语?最好中英文对照,不行的话只有英文也可以. 有关遗传的俗语或习语中英都可中英文都可以,比如江山易改,本性难移等. 有关遗传的习语或俗语,中英都可!中英文都可以,比如江山易改,本性难移等. 关于“生命的真谛”的文章,中英文都可以!英文的要求有翻译哦！用英文写关于中秋节的单词越多越好,中英文一起关于中秋节的都可以！关于感谢或歌颂母亲的文章中英文都可以,英文最好英语翻译“金宝隆华”的英文怎么翻译合适,给设计个LOGO中英文都可以 British business culture我要具体的材料中英文都可以,最好是英文. 介绍农村和城市的优缺点的英文作文题目 Living in city or in countryside?中英文都有傲慢与偏见英文版精彩句段和故事梗概,急!句段要英文的,最好长一点的,要几条就行,故事梗概可要中英文都可以.如果回答全面采纳额外加悬赏.谢谢!非常急! 跪求一篇英文演讲稿,大概三四分钟…中英文都要.题目是《我的梦想》中英文都要优美的关于圣诞节的英文小诗不要太长急回答后必有重金求.与玉米秸杆氧化预处理有关的英文文献.只要是有关的都可以.比如和秸杆有关,或者和氧化处理有关的都行..最好能是中英文都有的..英文字数在10000以上的文献...告诉我下载地址也行.