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中考化学文字表述题答题模板,规范解答不失分!

中考化学文字表述题答题模板,规范解答不失分!
中考题有些题目是要求文字表述,有些同学不会或表述不完整,这样失分有点太可惜,现整理一些问题,考生遇到同类问题只要填上即可。
(一)实验部分,这部分考的最多
1、检查装置气密性
【答题模板】装置形成密闭体系→操作方法(微热、手捂、热毛巾捂、注水等)→描述现象→得出结论
(1)手捂或热毛巾捂法:将待检装置导气管的一端放入水中,用手或热毛巾捂住装置,若导气管口有气泡逸出,停止加热后在导气管口倒吸形成一段水柱,表明装置气密性良好。
(2)液封法:若是有长颈漏斗或分液漏斗的装置:用止水夹夹紧导气管的橡皮管,从从长颈漏斗处加水(打开分液漏斗玻璃塞往分液漏斗中加水),一段时间后,若漏斗中的水不会再滴下,则装置气密性良好;
2、物质的检验、鉴别
【答题模板】
液体:取少量液体试剂于试管中→滴入XXX试剂→描述现象→得出结论
固体:取少量固体试剂于试管中,加水配成溶液→滴入XXX试剂→描述现象→得出结论
气体:将气体通入XXX溶液中→描述现象→得出结论
3. 测溶液pH的操作:
【答题模板】取一小块pH试纸放在表面皿上,用(干燥洁净的)玻璃棒蘸取待测液,点在pH试纸中部,半分钟内与标准比色卡对照。
4. 浓硫酸稀释(或与其它液体混合)操作:
【答题模板】将浓硫酸沿烧杯内壁缓缓注入水中(沿玻璃杯),并不断搅拌。
5. 实验中棉花的作用:
高锰酸钾热分解:过滤固体尘埃的作用,防高锰酸钾粉末堵塞导管。
6. 证明沉淀完全的操作:
【答题模板】静置,取沉淀后的上层清液,再加入××试剂,若没有沉淀生成,说明沉淀完全。
7. 判断沉淀洗净的方法:
【答题模板】取最后一次洗涤后的洗涤液,滴加××试剂(可与杂质的某些离子发生沉淀反应),若没有沉淀生成,说明沉淀洗涤干净。
8. 装置的安装与连接:自下而上,从左到右;洗气瓶“长进短出”,净化装置先除杂后干燥;干燥管“粗进细出”;排水量气的“洗气瓶”气体流向“短进长出”;蒸馏或冷却装置中的冷凝管冷却水的流向“低进高出”。
9. 排水量气读取体积的要求:(1)冷却至室温;(2)两液面相平;(3)读数时,视线与凹液面最低点相切。(另:实验前广口瓶与量筒间的导管中应充满水)
(二)化学工艺流程题常考查
1.对反应条件的分析可从以下几个方面着手:
A. 对反应速率有何影响?(如何提高反应速率?)
B. 对产率有何影响?(如何提高产率?)
C.对综合生产效益有何影响?(如原料成本,原料来源是否广泛、是否可再生,能源成本,对设备的要求,环境保护)——从绿色化学方面作答。
2.对流程理解的问题:
A.滤渣、滤液的主要成分?(明确发生了什么反应)
B.该反应的化学方程式?
C.循环利用与回收利用的物质?(循环利用是作为原料投入了,却没有消耗或又生成了;回收利用是指副产品)
D.特定步骤中加某物质的作用?(一般题干会有隐含信息)
3.高频问题:
(1) 过滤用到的三个玻璃仪器:
答:普通漏斗、玻璃棒、烧杯
(2) 过滤后滤液仍然浑浊的可能的操作原因:
答:滤纸破损;漏斗中液面高于滤纸边缘;仪器本身不干净
(3) 从溶液中得到晶体:
答:蒸发浓缩-冷却结晶-过滤-洗涤-干燥
(4) 蒸发浓缩用到的主要仪器有:蒸发皿、
答:蒸发皿、玻璃棒、烧杯、酒精灯等。(还有取蒸发皿用坩埚钳)
(5) 趁热过滤的原因:
答:减少过滤时间、保持过滤温度,防止××杂质析出;
(6) “趁热过滤”后,有时先往滤液中加入少量水,加热至沸,然后再“冷却结晶”:
答:稀释溶液,防止降温过程中××析出,提高产品的纯度
(7) 过滤的沉淀欲称重之前的操作:
答:过滤,洗涤,干燥,(在干燥器中)冷却,称重
(8) 水浴加热的好处:
答:受热均匀,温度可控,且温度不超过100℃
(9) 检验NH4+的方法和操作分别是:(注意方法与操作的差别)
方法:取XX溶液,加入NaOH溶液后加热,生成的气体能使润湿的红色石蕊试纸变蓝。
操作:取待测液少许于试管中,加入适量NaOH溶液后加热,若生成的气体能使润湿的红色石蕊试纸变蓝,则溶液中含有NH4

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  1. CONNECT:[ UseTime:0.000646s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000779s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000293s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000228s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000485s ]
  6. SELECT * FROM `set` [ RunTime:0.000197s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000497s ]
  8. SELECT * FROM `article` WHERE `id` = 547586 LIMIT 1 [ RunTime:0.000819s ]
  9. UPDATE `article` SET `lasttime` = 1776627042 WHERE `id` = 547586 [ RunTime:0.005857s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.001667s ]
  11. SELECT * FROM `article` WHERE `id` < 547586 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000537s ]
  12. SELECT * FROM `article` WHERE `id` > 547586 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000466s ]
  13. SELECT * FROM `article` WHERE `id` < 547586 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000831s ]
  14. SELECT * FROM `article` WHERE `id` < 547586 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000756s ]
  15. SELECT * FROM `article` WHERE `id` < 547586 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001266s ]
0.096715s