题干

“暖冰”是韩国首尔大学科学家将水置于一个足够强的电场中,在20℃时,水分子瞬间凝固形成的.某老师在课堂上做了一个如图所示的实验,发现烧杯中酸性KMnO4溶液褪色.若将烧杯中的溶液换成含有少量KSCN的FeCl2溶液,则溶液呈血红色.则下列说法中不正确的是(  )

A:在电场作用下,水分子间更易形成氢键,因而可以制得“暖冰”

B:水凝固形成20℃时的“暖冰”所发生的变化是化学变化

C:该条件下H2燃烧生成了既具有氧化性又具有还原性的物质

D:该条件下H2燃烧的产物只有H2O2

上一题 下一题 0.0难度 选择题 更新时间:2016-08-11 06:29:30

答案(点此获取答案解析)

B,D

同类题4

    On the first day of school our teacher introduced himself and challenged us to get to know someone we didn't already know. I stood up to look around when a gentle hand touched my shoulder.
    I turned around to find a little old lady with a warm smile. She said, “Hi, handsome. My name is Rose. I'm eighty-seven years old.”
“Why are you in university at such a young age?”I asked. She replied, “I'm here to meet a rich husband, get married, have a couple of kids, and then retire and travel.”
    I knew she was joking. I was curious(好奇) what might have encouraged her to be taking on this challenge at her age.
 “I always dreamed of having a university education and now I'm getting one!” she told me. We became friends. Every day we would talk nonstop after class. I always enjoyed listening to this “time machine” as she shared her wisdom(智慧) and experience with me. And Rose easily made friends wherever she went.
    At the end of the term we invited Rose to make a little speech. She cleared her throat and began, “We do not stop playing because we are old; we grow old because we stop playing. I've learned a few secrets to staying young, being happy, and achieving success. You have to laugh and find humor every day. You've got to have a dream. When you lose your dreams, you die.”
   “There is a huge difference between growing older and growing up. Anybody can grow older. That doesn't take any talent or ability. The idea is to grow up by always finding the opportunity in change……”