题目

pH和体积都相同的醋酸和硫酸，分别跟足量的碳酸钠溶液反应，在相同的条件下收集到的二氧化碳的体积(    ) A.醋酸多                         B.硫酸多 C.一样多                         D.无法比较 答案：A 解析:在pH和体积都相同的醋酸和硫酸中，电离的H+的物质的量相等。H2SO4是强酸，已完全电离成H+、SO。CH3COOH是弱酸，部分电离，溶液中存在大量未电离的CH3COOH分子。在与Na2CO3反应的过程中，未电离的CH3COOH分子可以不断电离出H+参与反应，导致产生的CO2较多。文中共有10处语言错误，每句中最多有两处。错误涉及一个单词的增加、删除或修改。增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词。删除：把多余的词用斜线 \ 划掉。修改：在错的词下划一横线，并在其下面写出修改后的词。注意：1.每处错误及其修改均仅限一词；    2.只允许修改10处，多者（从第11处起）不计分。My neighbor Li Hai is going to graduate from college soon and he hasn’t found the job yet. He was once advising to learn computer skills, so he thought it was difficult. When he saw others learning English, he shook his head, says it was too hard to remember new words. He enjoyed watching TV, playing card, smoking and so on. She felt it was hard for him to give up all these habits. Not long ago, he went to look a job. When he knew talents were great needed, he sighed and regretted the time that what he had wasted. He told me how he wished he has worked hard in college and asked me not to copy his example.