题目

人教版高中化学选修4实验2-3中用到了硫代硫酸钠，某化学兴趣小组对这一物质展开了如下探究。 （1） 实验一．制备Na2S2O3·5H2O通过查阅资料，该化学兴趣小组设计了如下的装置(略去部分夹持仪器)来制取Na2S2O3·5H2O晶体。已知烧瓶C中发生如下三个反应：Na2S(aq)＋H2O(l)＋SO2(g) ＝ Na2SO3(aq)＋H2S(aq)2H2S(aq)＋SO2(g) ＝3S(s)＋2H2O(l) ； S(s)＋Na2SO3(aq) Na2S2O3(aq)写出A中的化学反应方程式。 （2） 装置B的作用之一是观察SO2的生成速率。控制SO2生成速率可以采 Many people like to learn English with songs. But there's a difference between hearing English songs and learning from them. 1.Choose the right songs.Pick music you love and find English music that uses the right kind of language. 2. Songs that tell a story are easier to understand. If you are a beginner, you might even want to learn with children's songs or Disney songs.Sing along.You should try singing out loud to the music. This makes you pronounce in a right way and move with the rhythm（韵律）of the song.3.After a while, you should try singing the song without looking at the words. In this way, you may find that you can do a much better job in English. For example, you can use the words in the songs when you speak.Periodically（定期地）go back to the songs.4. In fact, after you get comfortable with one song, you can move to the next. And then after enough time passes, you can go back to the first song.Have fun and enjoy! Learn English with songs every day and you'll soon be surprised at how much progress（进步）you have made.A. Make sure that it's not too easy or too hard for you.B. Here are four tips to help you learn English with songs and music.C. You don't have to finish learning one song before you learn the next.D. Sing English songs with your friends or classmates.E. Try to sing from memory.