1.单选题- (共1题)

A.放电时Mg2+向正极迁移 |
B.放电时正极反应为Mo3S4+2xe-=Mo3S42x- |
C.充电时Mo3S4发生氧化反应 |
D.充电时阴极反应为Mg2++2e-=Mg |
2.选择题- (共2题)
I learned to do wood work when I was very young.
I remember I made my first project—a small table when I was 9 years old. I was so 1 of it that I looked upon it as if I had created a(an) 2. It was absolutely beautiful and it had taken me six weeks to3 it. I could hardly wait to give it to Mother Winters as a(an)4. She was the head mistress of our orphanage(孤儿院), who was always kind but 5 with us.
As the tables were not dry from the clear coating(清漆), our woodworking teacher told us to wait a few days before taking them to our dormitories. But I was just so 6and happy that I couldn't wait I dashed out like a 7, carrying my table, smiling from ear to ear.
When I reached the dormitory I placed the little table beside my bed. I was 8 it when Mother Winters entered. She walked over to the table. Running her hand 9 it, she noticed that it was still wet.
“Were you 10 to bring this home?” she asked.
“No, ma'am,” I 11 with my head down.
She ordered me to throw the table out and so I did. After she left, I immediately opened the door to get it back. There was 12 stuck all over. I brushed and cried, but the dirt would not come off.
I hid the table in my closet and never 13 it. However, a year later during a cleaning-up, it was discovered. Painfully, I had to give the table to Mother Henderson, my houseparent, thinking that she would 14 it away.
Thirty years later at a reunion, I 15 that Mother Henderson was living nearby, so I drove up to see her. We talked cheerfully for long. As I was about to leave, she asked me to come down to her 16 to get something important. I followed her 17 into a dark corner. She picked something up. 18 she turned around, I could see that she was holding a little table.
Mother Henderson kept the little table that I had given up for lost so long ago.
Today, I look at that table with bittersweet memories but full of 19 to Mother Henderson, who kept the table for a young orphan who 20 it so much.
3.填空题- (共2题)

(1)电解时,甲同学发现电极a附近溶液出现浑浊,请用离子方程式表示原因________________________________________________________________________。
(2)一段时间后,你认为C中溶液可能出现的现象是________________________,请用离子方程式表示原因______________________________________。
(3)实验结束后,乙同学将A中的物质冷却后加入到H2S溶液中发现有气泡出现,但加入到稀盐酸中却没有任何现象。请用化学方程式和简要的文字解释原因:________________________________________________________________________________________________________________________________________________。
(4)随着反应的进行,兴趣小组的同学们都特别注意到D中溶液红色逐渐褪去。他们对溶液红色褪去的主要原因提出了如下假设,请你完成假设二。
假设一:B中逸出的气体与水反应生成的物质有强氧化性,使红色逐渐褪去;
假设二:___________________________________________________。
(5)请你设计实验验证上述假设一,写出实验步骤及结论:________________________________________________________________________________________________________________________________________________________。

(1)在0→t1时间内,两个电极上的电极反应式为:
阳极:________________________________________________________________________;
阴极:________________________________________________________________________。
(2)用离子方程式表示0→t1时间内,溶液pH升高比较缓慢的原因:____________________________________________________________________________。
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【1】题量占比
单选题:(1道)
选择题:(2道)
填空题:(2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:1
5星难题:0
6星难题:2
7星难题:0
8星难题:0
9星难题:0