题目

    Controlling traffic is a complex and high cost problem in many developed countries. It becomes more difficult and costly with the ever-increasing number of cars on the roads. But scientists and students at the CATT, at the University of Maryland are working to solve this problem. They are using simulation(模拟) technologies to help government and private business control and react to changing traffic conditions.     The online economics magazine Forbes.com says traffic congestion(拥挤) cost Americans $ 124 billion in 2014 and that number could rise to $ 186 billion by 2图1甲图是利用一氧化碳与氧化铁反应装置示意图，图1乙是高炉炼铁示意图．请回答下列问题：（A处为澄清石灰水）（1）甲图实验过程中，先要进行的是______（填Ⅰ或Ⅱ）．Ⅰ：加热Ⅱ：通入CO（2）甲图中硬质玻璃管里发生反应的现象是______，观察到A处出现的现象是______，其中发生的化学反应方程式是______．（3）甲图中实验要在装置末端a处燃着一盏酒精灯，其作用是______；其中发生的化学反应方程式是______．（4）乙图中高炉炼铁时焦炭的作用是______．（5）为什么乙图中出铁口低于炉渣出口？______．（6）化学兴趣小组的同学为了测定某赤铁矿石中氧化铁的质量分数．某同学取一定质量的赤铁矿粉与过量的木炭粉混合后，用图2所示装置以合理的操作步骤测定（氢氧化钠溶液可以吸收二氧化碳气体）．①实验中持续通入干燥氮气．加热前缓缓通入一段时间，其作用是______．②停止加热前是否需要先断开a和b的连接处以防止倒吸？为什么？______．（7）试计算：我国铁矿石资源比较丰富，某钢铁厂用1000t 含氧化铁80% 的赤铁矿石，理论上可以炼出含铁96% 的生铁的质量是多少？（保留一位小数）