题目

用适当的文字或化学符合填空（1）某溶液中可能含有HCO3﹣、Cl﹣、SO42﹣、NO3﹣、CO32﹣等阴离子．当溶液中有大量H+存在时，则上述阴离子在溶液中不可能大量存在的是 ．当溶液中有大量Ba2+存在时，则上述阴离子在溶液中不可能大量存在的是．（2）硅是现代信息材料重要的物质，写出工业上制取粗硅的方程式．（3）在铝制易拉罐中收集一满罐CO2 ， 加入过量浓NaOH溶液，立即把口封闭，可以发现易拉罐变瘪了；过了一会儿易拉罐又鼓起来了．请用离句型转换1.The students are doing sports in the sports hall. (就划线部分提问)_______ are the students ________ sports?2.Aunt Wang makes red lanterns before Spring Festival. (改为一般疑问句)________ Aunt Wang ________ red lanterns before Spring Festival?3.The boy always wears black clothes on school days. (用never 改为否定句)The boy ________ ________ black clothes on school days.4.Our English teacher is working in the office. (改为同义句)Our English teacher is ________ ________ in the office.5.The shop usually opens at nine o’clock in the morning. (就划线部分提问)_______ ________ the shop usually open?