选词填空（10分）

schools  speak    comes  living   teacher  write  but  children  Chinese  thinks      

Mr. Smith is my new friend. He _小题1:__ from Paris, France. He’s a French _小题2:___  of a middle school. His students all like him very much. He can __小题3:___ some Chinese, _小题4:__  not much. He wants to learn more, so he goes to __小题5:__ classes every week. He likes _小题6:__ and working in China very much. He ___小题7:_the Chinese people are very friendly(友好的). He has two  __小题8:__ , Maria and Tom. They are students, but they go to different(不同的) __小题9:___  . They have some pen pals and they often  _小题10:___ to the pen pals. They also have many Chinese friends at school and they play games after class.

根据硫化氢气体的实验室制法和性质完成下列填空．

（1）若用启普发生器制取硫化氢气体，则制取气体的原料可选用______．

a．稀硫酸与硫化亚铁         b．稀硝酸与硫化亚铁

c．稀硫酸与硫化钠           d．稀盐酸与硫化亚铁

（2）现要组装一套可以控制硫化氢气体产生速率的装置，请在图1中选择合适的仪器：______（填编号）．

（3）如图2，在一个充满氧气的集气瓶中加入少量品红稀溶液，点燃硫化氢气体．在火焰自动熄灭后，停止通入气体，瓶内可观察到的现象是______．

（4）在上述集气瓶中继续通入硫化氢气体，振荡，发生反应的化学方程式为：______反应过程中，溶液的pH______（填“变大”、“变小”或“不变”）．

（5）点燃不纯的硫化氢气体可能会发生爆炸，为了防止意外，可连接一个安全装置．图3的装置能起到此作用的是______．

（6）已知硫化氢气体在空气中的体积分数为4.3%-45.5%时会发生爆炸．当硫化氢气体在空气中的体积分数为30%时，其爆炸产物是______．