题目

Many people think that the most popular way of communicating with other people is through the mouth. But what they don’t know is that actual communication using the mouth accounts for only around 10% (or even less) of all the means to communicate a message. Moreover, you can never determine the truthfulness or honesty of people by what they say alone. In fact, words expressed through the mouth often do not reflect what people really think or feel. The more reliable way you can determine their true inner feelings and thoughts is by reading their body language. Everybody communicates using th现有A、B、C、D、E五种初中化学常见的物质，其中B、D是由三种元素组成的化合物，C、E是由两种元素组成的化合物，C在通常状况下为气体，A的粉末是黑色的，D可以用来配置波尔多液，D、E含有相同的两种元素。用两圆间的短线“﹣”表示两种物质可以发生化学反应，箭头“→”表示一种物质能转化为另一种物质。请回答下列问题：（以上反应均在初中知识范围内）（1）在图中标出C和D物质的化学式________；（2）写出B和E反应的化学方程式为_____；（3）过量A与B反应的实验现象为_____。