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（10分）工业上用碳酸钠溶液与石灰水反应制烧碱。对于碳酸钠溶液与石灰水是否恰好完全反应，某化学兴趣小组的同学将其产物进行过滤，并对滤液进行如下探究。 【提出问题】滤液中含有哪些溶质？ 【猜想与假设】假设一：滤液中只含氢氧化钠     假设二：滤液中含氢氧化钠和碳酸钠 假设三：滤液中含 假设四：滤液中含氢氧化钠、氢氧化钙和碳酸钠 【进行实验】甲同学设计了如下实验方案： 实验步骤 实验现象 结论 取少量滤液放在试管中，再滴入氯化钙溶液 若生成白色沉淀 碳酸钠过量 若无明显现象 恰好反应 【反思与评价】 （1）碳酸钠溶液与石灰水反应的基本类型为 。 （2）认为假设四不合理，理由是 。 （3）丙同学认为甲同学设计方案还不能说明碳酸钠溶液和澄清石灰水恰好完全反应，她的理由是 。 （4）认为要说明碳酸钠溶液与石灰水是否恰好完全反应，还需在甲同学实验方案的基础上进行实验。她的实验方案是： 实验步骤 实验现象和结论 【定量研究】 （5）戊同学称取100g烧碱固体样品（样品中的杂质是碳酸钠）， 加水溶解得到溶液A，取A溶液的1/5向其中加入CaCl 2 溶液。 反应时CaCl 2 溶液与沉淀的质量关系如图所示。 ①样品中氢氧化钠的质量为 g； ②计算所加CaCl 2 溶液中钙离子的质量分数。（写出计算过程）
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举一反三
【单选题】Boys and girls, wish you to do well in the English exam ____ a light heart. Good luck to everyone!
A.
on  
B.
with  
C.
without
查看完整题目与答案
【单选题】Why can't you see light when you look at a black hole?
A.
Because most black holes are so far away.
B.
Because the gravity of a black hole is so strong that it sucks? the light inward.
C.
Because as the star's gases burn, it stops giving off heat and light.
D.
Because as a star cools, its outer layers pull in toward its center.
查看完整题目与答案
【单选题】—Look，the light in Jim’s room is still on. Do you know­­______? —To study for the coming exam, maybe.
A.
if he works hard
B.
why is he so busy
C.
why he stays up so late
D.
when he will stop working
查看完整题目与答案
【单选题】Boys and girls, wish you to do well in the English exam _____ a light heart. Good luck to everyone! [     ]
A.
on
B.
with
C.
without
D.
in
查看完整题目与答案
【单选题】You look that light-hearted. Nothing seems ________ to you.
A.
to happen
B.
to be happened
C.
to have happened
D.
to have been happened
查看完整题目与答案
【判断题】当箍筋为多肢复合箍筋时，应采用大箍套小箍的形式。
A.
正确
B.
错误
查看完整题目与答案
【单选题】You look light-hearted. Nothing seems ______ to you.
A.
to happen
B.
to have been happened
C.
to have happened
D.
to be happened
查看完整题目与答案
【单选题】在句子“A light heart lives long.”中,主语部分是:
A.
heart
B.
A light heart
C.
light heart
D.
lives
查看完整题目与答案
【简答题】You look light-hearted. Nothing seems _____ to you.A. to happen B. to have been happened C. to have happened D. to be happened
查看完整题目与答案
【单选题】You look like light-hearted. Nothing seems ____ to you. [     ]
A.
to happen
B.
to be happened
C.
to have happened
D.
to have been happened
查看完整题目与答案
相关题目：
【单选题】Boys and girls, wish you to do well in the English exam ____ a light heart. Good luck to everyone!
A.
on  
B.
with  
C.
without
查看完整题目与答案
【单选题】Why can't you see light when you look at a black hole?
A.
Because most black holes are so far away.
B.
Because the gravity of a black hole is so strong that it sucks? the light inward.
C.
Because as the star's gases burn, it stops giving off heat and light.
D.
Because as a star cools, its outer layers pull in toward its center.
查看完整题目与答案
【单选题】—Look，the light in Jim’s room is still on. Do you know­­______? —To study for the coming exam, maybe.
A.
if he works hard
B.
why is he so busy
C.
why he stays up so late
D.
when he will stop working
查看完整题目与答案
【单选题】Boys and girls, wish you to do well in the English exam _____ a light heart. Good luck to everyone! [     ]
A.
on
B.
with
C.
without
D.
in
查看完整题目与答案
【单选题】You look that light-hearted. Nothing seems ________ to you.
A.
to happen
B.
to be happened
C.
to have happened
D.
to have been happened
查看完整题目与答案
【判断题】当箍筋为多肢复合箍筋时，应采用大箍套小箍的形式。
A.
正确
B.
错误
查看完整题目与答案
【单选题】You look light-hearted. Nothing seems ______ to you.
A.
to happen
B.
to have been happened
C.
to have happened
D.
to be happened
查看完整题目与答案
【单选题】在句子“A light heart lives long.”中,主语部分是:
A.
heart
B.
A light heart
C.
light heart
D.
lives
查看完整题目与答案
【简答题】You look light-hearted. Nothing seems _____ to you.A. to happen B. to have been happened C. to have happened D. to be happened
查看完整题目与答案
【单选题】You look like light-hearted. Nothing seems ____ to you. [     ]
A.
to happen
B.
to be happened
C.
to have happened
D.
to have been happened
查看完整题目与答案
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