1.单选题- (共1题)
A.此X元素的气态氢化物的化学式为HX,在常温下很稳定 |
B.其单质带有金属光泽,具有强氧化性,可与KI发生置换反应生成I2 |
C.其单质的分子式为X2,易溶于有机溶剂 |
D.AgX是一种有色的易溶于水的化合物 |
2.选择题- (共2题)
In American schools there is something called Homecoming Day. Many high schools and colleges with a football team have a homecoming game. This can be the most important thing of the year except graduation or commencement(颁授学位典礼) day. Students plan Homecoming Day for many weeks before the day.
Several days before Homecoming, students start to decorate the schoool. There are signs to wish luck to the team, and many other signs to welcome all the students. Many people still come to Homecoming twenty or thirty years after they leave school.
During the day people like to look for teachers that they remember from long ago. Often they see old friends and they talk together about those happy years in school.
Everyone soon comes to watch the football game. When the game is half over, the band comes onto the field and plays school songs. Another important moment is when the Homecoming Queen or King appears. All the students vote a most popular student Homecoming Queen or King. It is a great honor to be chosen.
Homecoming is a happy day, but it is not perfect unless the football team wins the game. Even if the team loses, the students still enjoy Homecoming. Some stay at the school to dance, and others go to a party. For everyone it is a day worth remembering.
In American schools there is something called Homecoming Day. Many high schools and colleges with a football team have a homecoming game. This can be the most important thing of the year except graduation or commencement(颁授学位典礼) day. Students plan Homecoming Day for many weeks before the day.
Several days before Homecoming, students start to decorate the schoool. There are signs to wish luck to the team, and many other signs to welcome all the students. Many people still come to Homecoming twenty or thirty years after they leave school.
During the day people like to look for teachers that they remember from long ago. Often they see old friends and they talk together about those happy years in school.
Everyone soon comes to watch the football game. When the game is half over, the band comes onto the field and plays school songs. Another important moment is when the Homecoming Queen or King appears. All the students vote a most popular student Homecoming Queen or King. It is a great honor to be chosen.
Homecoming is a happy day, but it is not perfect unless the football team wins the game. Even if the team loses, the students still enjoy Homecoming. Some stay at the school to dance, and others go to a party. For everyone it is a day worth remembering.
3.实验题- (共1题)
(1)实验目的
探究同一主族元素性质的递变规律。
(2)实验用品
仪器:试管、胶头滴管
药品:新制氯水、新制溴水、溴化钠溶液、碘化钠溶液、四氯化碳
(3)实验内容(在下表横线中填写相关内容)
序号 | 实验方案 | 实验现象 |
① | 向盛有少量溴化钠溶液的试管中滴加少量新制氯水,振荡,再加入少量四氯化碳,振荡后静置 | 液体分为两层,下层呈 |
② | 向盛有少量碘化钠溶液的试管中滴加少量新制溴水,振荡,再加入少量四氯化碳,振荡后静置 | 液体分为两层,下层呈 |
(4)实验结论:
(5)问题和讨论
①上述两个实验中发生反应的离子方程式分别为
②由于氟单质过于活泼,所以很难设计出一个简单的实验来验证其氧化性的强弱。试列举两项事实说明氟的非金属性比氯的强:
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【1】题量占比
单选题:(1道)
选择题:(2道)
实验题:(1道)
-
【2】:难度分析
1星难题:0
2星难题:0
3星难题:0
4星难题:0
5星难题:0
6星难题:1
7星难题:0
8星难题:0
9星难题:1