题目

根据下列实验示意图回答问题：               A                       B                   C（1）实验A中的实验现象是                                             ；写出反应的化学表达式                                           ；其基本反应类型是                        。（2）实验B的结论除说明气体的密度外，还可说明该气体的性质有                  ---I'm going to visit the Science Museum tomorrow.---________A.Enjoy yourself!B.Come on!C.Good luck!D.It doesn't matter.