皮皮学，免费搜题
登录
logo - 刷刷题
搜题
【简答题】
实验室常用加热氯酸钾与二氧化锰混合物的方法制取氧气，写出反应的文字表达式：______ 小芳发现，氯酸钾与氧化铜混合加热，也能较快产生氧气，于是进行如下探究： [提出猜想]除二氧化锰、氧化铜外，三氧化二可以作氯酸钾分解的催化剂． [完成实验]按下表进行试验，并测定分解温度（分解温度越低，催化效果越好）． 实验编号 实验药品 分解温度（℃） ① 氯酸钾 580 ② 氯酸钾、二氧化锰（质量比1：1） 350 ③ 氯酸钾、氧化铜（质量比l：1） 370 ④ 氯酸钾、三氧化二铁（质量比1：1） 390 [分析数据、得出结论]（1）由实验______与实验④对比，证明猜想合理 （2）实验所用的催化剂，催化效果最好的是______． [反思]（若要证明三氧化二该反应的催化剂，还要验证它在化学反应前后______和______不变．
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
【单选题】This work is _________difficult for us. We need _________people.
A.
too much; three more
B.
too much; other three
C.
much too; more three
D.
much too; another three
查看完整题目与答案
【单选题】This maths problem is easy to work out. This maths problem is not _ to work out.
A.
difficult
B.
easy
查看完整题目与答案
【判断题】有学者认为,在生物学中,历史叙述比定律解释更为重要。
A.
正确
B.
错误
查看完整题目与答案
【单选题】This work is expected to fulfill a need that lawyers have felt for many years.
A.
satisfy
B.
accomplish
C.
fill
D.
realize
查看完整题目与答案
【单选题】. I feel the thing that’s exciting to me about this work is finding ways to do something in the space of an evening ________ people can sit through to deal with large concerns.
A.
when
B.
that
C.
while
D.
how
查看完整题目与答案
【单选题】2017年1月18日,习近平在日内瓦万国宫出席“共商共筑人类命运共同体”高级别会议,深刻、全面、系统阐述人类命运共同体理念,贡献了中国智慧与中国方案。60多年前,中国也贡献了一个完美的方案,促进了中国同亚非各国的团结和合作。这一“方案”是指( )
A.
Ａ. 提出“求同存异”方针
B.
Ｂ. 坚持独立自主的和平外交政策
C.
Ｃ. 提出建立上海合作组织
D.
Ｄ.倡导签署《联合国家宣言》
查看完整题目与答案
【单选题】固定资产周转率高说明( )
A.
定资产投资得当
B.
定资产结构合理
C.
定资产利用率高
D.
业营运能力不强
查看完整题目与答案
【单选题】Which of the following sentences is a clear indication of the CONTRIBUTION? “The events and the associated factors are classified in three phases to identify and explain what hygienes and motivators l...
A.
“The events and the associated factors are classified in three phases to identify and explain what hygienes and motivators look like for smartphone use and how frequent they are in comparison to other factors that contribute to users’ satisfaction/dissatisfaction.”
B.
“The key significance of this work is to provide data on the relevance of hygienes and motivators in a UX context and to give concrete examples of these factors for smartphone use.”
C.
“Moreover, we investigate the link between Hassenzahl’s [Hassenzahl 2004] concept of pragmatic and hedonic quality and the hygienes’motivator notion.”
D.
“Based on previous discussions in the UX literature, we expect that pragmatic quality can be considered as hygiene and hedonic quality as motivator.”
查看完整题目与答案
【判断题】有学者认为，在生物学中，历史叙述比定律解释更为重要。
A.
正确
B.
错误
查看完整题目与答案
【单选题】麻药作用机制的脂溶性学说是谁提出的():
A.
Bernard;
B.
Overton-Meyer;
C.
Lnly;
D.
Walter;
E.
Sucking
查看完整题目与答案
相关题目：
【单选题】This work is _________difficult for us. We need _________people.
A.
too much; three more
B.
too much; other three
C.
much too; more three
D.
much too; another three
查看完整题目与答案
【单选题】This maths problem is easy to work out. This maths problem is not _ to work out.
A.
difficult
B.
easy
查看完整题目与答案
【判断题】有学者认为,在生物学中,历史叙述比定律解释更为重要。
A.
正确
B.
错误
查看完整题目与答案
【单选题】This work is expected to fulfill a need that lawyers have felt for many years.
A.
satisfy
B.
accomplish
C.
fill
D.
realize
查看完整题目与答案
【单选题】. I feel the thing that’s exciting to me about this work is finding ways to do something in the space of an evening ________ people can sit through to deal with large concerns.
A.
when
B.
that
C.
while
D.
how
查看完整题目与答案
【单选题】2017年1月18日,习近平在日内瓦万国宫出席“共商共筑人类命运共同体”高级别会议,深刻、全面、系统阐述人类命运共同体理念,贡献了中国智慧与中国方案。60多年前,中国也贡献了一个完美的方案,促进了中国同亚非各国的团结和合作。这一“方案”是指( )
A.
Ａ. 提出“求同存异”方针
B.
Ｂ. 坚持独立自主的和平外交政策
C.
Ｃ. 提出建立上海合作组织
D.
Ｄ.倡导签署《联合国家宣言》
查看完整题目与答案
【单选题】固定资产周转率高说明( )
A.
定资产投资得当
B.
定资产结构合理
C.
定资产利用率高
D.
业营运能力不强
查看完整题目与答案
【单选题】Which of the following sentences is a clear indication of the CONTRIBUTION? “The events and the associated factors are classified in three phases to identify and explain what hygienes and motivators l...
A.
“The events and the associated factors are classified in three phases to identify and explain what hygienes and motivators look like for smartphone use and how frequent they are in comparison to other factors that contribute to users’ satisfaction/dissatisfaction.”
B.
“The key significance of this work is to provide data on the relevance of hygienes and motivators in a UX context and to give concrete examples of these factors for smartphone use.”
C.
“Moreover, we investigate the link between Hassenzahl’s [Hassenzahl 2004] concept of pragmatic and hedonic quality and the hygienes’motivator notion.”
D.
“Based on previous discussions in the UX literature, we expect that pragmatic quality can be considered as hygiene and hedonic quality as motivator.”
查看完整题目与答案
【判断题】有学者认为，在生物学中，历史叙述比定律解释更为重要。
A.
正确
B.
错误
查看完整题目与答案
【单选题】麻药作用机制的脂溶性学说是谁提出的():
A.
Bernard;
B.
Overton-Meyer;
C.
Lnly;
D.
Walter;
E.
Sucking
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