题目

听下面一段独白，回答以下小题。【1】What is the announcement about?A.The school’s sports meet.B.A visit to the zoo.C.A trip to the countryside.【2】Where are the students going to camp?A.In the forest. B.By the river. C.Near the park.【3】Why shouldn’t the students go into the thick part of the forest?A.They may get lost in it.B.There are wild animals there.C.There is a river in the forest.【4】What can we learn from the announcement?A.They are going to go to the forest together by bus.B.They will be able to make a fire at the camping site.C.They will need to pay for I．已知A、B、C、D、E五种物质中均含有某种相同的非金属元素，B为无色液体，C为黑色固体，D气体能使澄清石灰水变浑浊。图中“→”表示物质之间的转化关系。五种物质的转化关系如图所示(图中反应条件及部分反应物或生成物省略)。(1)A、E的化学式分别是_____________、__________________。(2)A→C反应的化学方程式是___________________________。(3)A→B反应的化学方程式是___________________________。II．工业制取硝酸的流程如下：(1)步骤②是利用了氮气与氧气____________的不同，是____________变化(填“物理“或”化学“)。(2)步骤③是化合反应，写出③的化学方程式为_______________________________。(3)步骤④的化学方程式为 4NH3+5O24NO+6X，X的化学式为_________________。(4)流程中一定要循环使用的物质是_____________________(写化学式)。