2014高考化学二轮复习限时集训 专题9电化学原理练习卷B(带解析)

适用年级:高三
试卷号:260155

试卷类型:专题练习
试卷考试时间:2017/7/20

1.单选题(共1题)

1.
镁及其化合物一般无毒(或低毒)、无污染,且镁原电池放电时电压高而平稳。其中一种镁电池的反应为xMg+Mo3S4MgxMo3S4,下列说法错误的是()
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)

2.小明不慎将一块三角形的玻璃摔碎成如图所示的四块(即图中标有1、2、3、4的四块),你认为将其中的哪一些块带去,就能配一块与原来一样大小的三角形?应该带(   )

3.阅读下面短文,从短文后各题所给的四个选项(A、B、C、D)中,选出可以填入空白处的最佳选项。

    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)

4.
某中学课外兴趣小组用惰性电极电解饱和食盐水(含少量Ca2 、Mg2)作系列探究,装置如图所示:

(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:________________________________________________________________________________________________________________________________________________________。
5.
用惰性电极电解NaCl与NaHCO3的混合溶液,测得溶液的pH变化如图所示。

(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:____________________________________________________________________________。
试卷分析
  • 【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