皮皮学，免费搜题
登录
logo - 刷刷题
搜题
【简答题】
(6分)科学探究是奇妙的过程。在一次实验中，小明不小心把硫酸铜溶液滴加到了5％H 2 0 2 的溶液的试管中，立即有大量的气泡产生。硫酸铜溶液中含有三种粒子(H 2 O、SO 4 2- 、Cu 2+ )，小明想知道硫酸铜溶液中的哪种粒子能使双氧水分解的速率加快。请你和小明一起通过下图所示的三个实验完成这次探究活动，并填写空白。 (1)你认为最不可能的是哪一种粒子，理由是 。 (2)检验实验①产生的气体的方法是 。 (3)要证明另外两种粒子能否加快双氧水分解的速率，还需要进行实验②和③；在实验②中加入稀硫酸后，无明显变化，证明 不起催化作用；在实验③中加入 后，会观察到大量的气泡，证明起催化作用的是 。 (4)小明如果要确定硫酸铜是催化剂，还须通过实验确认它在化学反应前后 。
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
微信内点击右上角“…”即可分享
反馈
参考答案：
举一反三
【判断题】生父母送养子女,须双方共同送养。
A.
正确
B.
错误
查看完整题目与答案
【单选题】幼儿乳牙因 薄, 松脆,易发生龋齿。 ( )
A.
牙本质;牙釉质
B.
牙骨质;牙釉质
C.
牙釉质;牙本质
D.
牙釉质;牙骨质
查看完整题目与答案
【单选题】I don't know if Mr. Wang ______ on a field trip. If he ______on a field trip tomorrow. [     ]
A.
goes; will go
B.
will go; goes
C.
will go; will go
D.
goes; goes
查看完整题目与答案
【单选题】幼儿乳牙因( )薄,( )松脆,易发生龋齿。
A.
牙本质，牙轴质
B.
牙骨质，牙轴质
C.
牙轴质，牙本质
D.
牙轴质，牙骨质
查看完整题目与答案
【单选题】What do we learn from the story?
A.
The trip didn't do any good to his health.
B.
The trip was a complete disappointment.
C.
The trip was enjoyable but not fruitful in terms of business.
D.
The trip has helped him meet many interesting people.
查看完整题目与答案
【判断题】若某商品的需求价格弹性Ed =0.6，卖者提高价格肯定增加销售收入。
A.
正确
B.
错误
查看完整题目与答案
【单选题】幼儿乳牙因( ),易发生龋齿。
A.
牙釉质较薄，牙本质松脆
B.
牙本质较薄，牙釉质坚硬
C.
牙本质较厚，牙釉质坚硬
D.
牙本质较厚，牙釉质脆软
查看完整题目与答案
【单选题】What do we learn from the story?
A.
The trip didn't do any good to his health.
B.
The trip helped him meet many interesting people.
C.
The trip was enjoyable but not fruitful in terms of business.
D.
The trip was a complete disappointment.
查看完整题目与答案
【单选题】What do we learn from the story?
A.
The trip didn't do any good to his health.
B.
The trip was a complete disappointment.
C.
The trip was enjoyable but not fruitful in terms of business.
D.
The trip helped him meet many interesting people.
查看完整题目与答案
【单选题】--- The Greens have gone to Yangzhou for a trip, haven’t they ? ---____ , and they will return tomorrow afternoon.
A.
Yes, they have
B.
No, they haven’t
C.
Yes, they haven’t
D.
No, they have
查看完整题目与答案
相关题目：
【判断题】生父母送养子女,须双方共同送养。
A.
正确
B.
错误
查看完整题目与答案
【单选题】幼儿乳牙因 薄, 松脆,易发生龋齿。 ( )
A.
牙本质;牙釉质
B.
牙骨质;牙釉质
C.
牙釉质;牙本质
D.
牙釉质;牙骨质
查看完整题目与答案
【单选题】I don't know if Mr. Wang ______ on a field trip. If he ______on a field trip tomorrow. [     ]
A.
goes; will go
B.
will go; goes
C.
will go; will go
D.
goes; goes
查看完整题目与答案
【单选题】幼儿乳牙因( )薄,( )松脆,易发生龋齿。
A.
牙本质，牙轴质
B.
牙骨质，牙轴质
C.
牙轴质，牙本质
D.
牙轴质，牙骨质
查看完整题目与答案
【单选题】What do we learn from the story?
A.
The trip didn't do any good to his health.
B.
The trip was a complete disappointment.
C.
The trip was enjoyable but not fruitful in terms of business.
D.
The trip has helped him meet many interesting people.
查看完整题目与答案
【判断题】若某商品的需求价格弹性Ed =0.6，卖者提高价格肯定增加销售收入。
A.
正确
B.
错误
查看完整题目与答案
【单选题】幼儿乳牙因( ),易发生龋齿。
A.
牙釉质较薄，牙本质松脆
B.
牙本质较薄，牙釉质坚硬
C.
牙本质较厚，牙釉质坚硬
D.
牙本质较厚，牙釉质脆软
查看完整题目与答案
【单选题】What do we learn from the story?
A.
The trip didn't do any good to his health.
B.
The trip helped him meet many interesting people.
C.
The trip was enjoyable but not fruitful in terms of business.
D.
The trip was a complete disappointment.
查看完整题目与答案
【单选题】What do we learn from the story?
A.
The trip didn't do any good to his health.
B.
The trip was a complete disappointment.
C.
The trip was enjoyable but not fruitful in terms of business.
D.
The trip helped him meet many interesting people.
查看完整题目与答案
【单选题】--- The Greens have gone to Yangzhou for a trip, haven’t they ? ---____ , and they will return tomorrow afternoon.
A.
Yes, they have
B.
No, they haven’t
C.
Yes, they haven’t
D.
No, they have
查看完整题目与答案
参考解析：
知识点：
题目纠错 0
发布
创建自己的小题库 - 刷刷题