题目

暗紫色固体A在加热的条件下反应生成B和C以及D，常温下过氧化氢溶液遇到C时分解放出D，其中C在反应前后的质量和化学性质都没有改变，若将细铁丝放在D中点燃能剧烈燃烧，火星四射，生成黑色固体E． （1）写出各物质的名称：A  ；B  ；C  ； （2）细铁丝在D中燃烧的化学方程式   ． 答案：【考点】物质的鉴别、推断；书写化学方程式、文字表达式、电离方程式． 【专题】常见物质的推断题． 【分析】根据细铁丝在D中点燃能剧烈燃烧，火星四射，生成黑色固体E，所以D是氧气，E就是四氧化三铁，常温下过氧化氢溶液遇到C时分解放出氧气，其中C在反应前后的质量和化学性质都没有改变根据短文内容及所给提示，补全文中单词或用所给单词的正确形式填空Accidents often happen in life. As for me, I have been hurt many times. So my mother often warns me to be c1.. I remember when I was young, my mother2.(take) me to the park. I was excited. I jumped u3.and down. Suddenly, I was4.(hit) by a stone and fell to the ground. My head was bleeding. My mother had no choice but5.(send) me to the hospital. With the doctor's help, I was well again.