问题
选择题
判断下列有关化学基本概念的依据不正确的是（ ）
A．溶液与胶体：能否发生丁达尔效应
B．氧化还原反应：元素化合价是否变化
C．强弱电解质：在水溶液或熔融状态下能否完全电离
D．共价化合物：是否含有共价键
答案
答案：D
含有共价键的化合物也可能是离子化合物，如氢氧化钠，只有只含共价键的化合物才是共价化合物。
搜题请搜索小程序“爱下问搜题”
判断下列有关化学基本概念的依据不正确的是（ ）
A．溶液与胶体：能否发生丁达尔效应
B．氧化还原反应：元素化合价是否变化
C．强弱电解质：在水溶液或熔融状态下能否完全电离
D．共价化合物：是否含有共价键
答案：D
含有共价键的化合物也可能是离子化合物，如氢氧化钠，只有只含共价键的化合物才是共价化合物。
根据短文内容，将下面A－E五个句子分别填入文中空缺处，使补全后的短文意思通顺，结构完整。（10分）  Mr. Webster manages a bar in our town. Its name it The White Horse, for a picture of a white horse was once hung on the wall. 小题1: but in the past things were quite different. At that time, Mr. Webster was much worried about his bar. One day a friend of his came, looked around and said, “Take down the picture of the white horse and change it for a picture of a black one.” “ 小题2: ” Mr. Webster said. “Yes, but just do it.” His friend said and went out of the bar. Mr. Webster went to an artist and said, “ 小题3: ” The next day a picture of a black horse appeared on the wall. Soon after the door opened, a man came in and shouted, “ 小题4: The picture on the wall is different from the name.” Then he sat down and drank something. 小题5: and the another and another. A lot of people came in and said, “The picture on your wall is wrong.” But they all stopped and drank in Mr. Webster’s bar. From then on, Mr. Webster was happy again.
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