江西省2023届九年级第三次阶段适应性评估 R-PGZX A JX道德与法治试题答案
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17.(1)Cu+2H2S)4(浓)二CuS04+SO2+2H2O(2分)(2)用冰水浴；悬浊液变澄清（各1分）(3)过滤，用SO2水溶液将滤液pH调至2.8~3.5(2分)(4)减压在低于45℃蒸发结晶、干燥(2分)》(5)①滴入最后半滴KMO4溶液时，液体由无色变为浅粉色，且半分钟内不变色②2MnO4+3Mn2++2H2O—5MnO2￥+4H+(各2分)【命题意图】本题以连二硫酸锰的制备实验为背景，重点考查化学方程式的书写、实验条件的控制、基本实验操作、含量测定等，检测学生的基本操作的规范性和准确性及灵活运用知识解决实际问题的能力。【规律总结】以典型物质制备为中心的实验综合题一直是考生得分率较低的题型，这类题涉及典型的系统装置或装置连接，系统装置一般包括：气体制备、净化及干燥装置，制备的核心装置，气态物质的检验及尾气处理装置等。解答这类题首先要弄清实验目的、原理，气体中可能含有的杂质与可行的净化方法，核心制备装置中反应条件的控制方法，尾气处理原理，对装置的评价。相应的装置的连接顺序大致是：气体发生装置→净化装置→干燥装置→核心制备装置→气体检验装置→尾气处理装置（按气流方向）。装置连接呈现形式有两种，一是装置连接顺序（填装置序号），二是玻璃接口连接顺序，接口连接时注意一般是长进短出（防倒吸装置除外)，干燥管是大口进小口出。另外考试大纲规定“预测或描述实验现象”“控制实验条件的方法”都是要求考生掌握的内容。
One possible version:When we arrived back at the orchard,I was surprised tosee some of my apples were missing.Some of Luke's appleswere missing,too.He looked worried and said,"Let'spick a few more and go.Luke climbed up a tree.I quick-47·ly picked apples from the lower branches.Then came astrange sound.I looked around and tried to see who wasthere.Branches reached out like arms.Something brushedagainst my back.I shouted."What's the matter?"shou-ted Luke,going down the tree.The strange soundcameagain.I turned and relaxed.It was Mr.Smith's horse,Sandy.He almost frightened me to death."Now we know who ate our apples,"said Luke,laugh-ing."You found my horse,"Mr.Smith said when he sawLuke and I walking down the hill with Sandy.I smiled andasked him whether he knew Sandy was the mystery of theapple orchard.Mr.Smith shook his head and said thathe'd heard strange things were happening up there but hedidn't know it was Sandy."So it is not surprising thathe's always running off,"Mr.Smith added.We alllaughed.
