您所在的当前位置：高中化学试题 >

物质的分离、提纯

> 用括号内的试剂和方法除去下列各物质中的少量杂质，不正确的是 [ ] A．苯中含有苯酚（浓溴水，过滤） B．乙酸钠中含有碳酸钠（乙酸、蒸发） C．乙酸乙酯中含有乙酸（饱和碳酸钠溶液、分液） D．溴乙烷中含有乙醇（水、分液）

问题：

发布时间：2024-09-13

用括号内的试剂和方法除去下列各物质中的少量杂质，不正确的是
[ ]
A．苯中含有苯酚（浓溴水，过滤）
B．乙酸钠中含有碳酸钠（乙酸、蒸发）
C．乙酸乙酯中含有乙酸（饱和碳酸钠溶液、分液）
D．溴乙烷中含有乙醇（水、分液）

参考答案：

提问用户：ld***uz5

可能感兴趣的题目：

1 16、17世纪，中国社会曾出现了“西学东渐”之风，近代时“西学东渐”不断深入，对此理解不正确的是 [ ] A．早期民主启蒙思想中的反君主专制主张是西学东渐的最早表现 B．西学东渐过程中，曾经出现“中学为体、西学为用”的思想主张 C．近代西学东渐的逐步深入其根本原因是由于近代经济的产生与发展 D．西学东渐有利于中西方的思想文化交流
2 放射性元素的原子核 MZ X连续经过三次α衰变和两次β衰变，若最后变成另一种元素的原子核Y，则新核Y的正确写法是（　　） A． (M-14)(Z-2) Y B． (M-12)(Z-6) Y C． (M-12)(Z-4) Y D． (M-12)(Z-1) Y
3 ab＜0，a＞0，|a|＞|b|，则a+b A.大于0 B.小于0 C.小于或等于0 D.无法确定
4 听力 1. What does the man think of the dinner? A. Good. B. Cheap. C. Expensive. 2. What does the man plan to do this afternoon? A. Go to a movie. B. Buy a new pair of glasses. C. Attend his classes. 3. What is the probable relationship between the two speakers? A. Husband and wife. B. Boss and secretary. C. Teacher and student. 4. What does the man mean? A. He is Dr.Johnson. B. He doesn"t know why she came here. C. The doctor will be with the man soon. 5. How much will the man pay? A. 25 pence. B. 30 pence. C. 60 pence.
5 SEOUL, Sept. 26 (Xinhua) — Hundreds of families from the two Koreas on Saturday met at the DPRK"s (朝鲜人民主主义人民共和国) Mount Kumgang resort (度假胜地)in the first government-arranged reunion since the inauguration（就职）of South Korean President Lee Myung-bak. Earlier in the day, 96 South Koreans, of whom more than three-quarters were at the age of 70 or older, crossed the inter-Korean border（韩朝边界）, heading for the Kumgang resort to meet their families separated by the 1950—1953 Korean War. Arriving at the DPRK"s resort in the afternoon, South Koreans met with their long-separated families at a large-scale gathering at around 3 p.m. local time, and later are to have a dining meeting in the evening. The separate, personal meetings are planned to be held on Sunday. The South Korean families will come back home on Monday after the three-day gathering, followed by the second-session reunion event which will last from Tuesday to Thursday. The reunion, which had become a semi-regular event(半定期举行的活动) since 2000 after a historic inter-Korean summit in Pyongyang(平壤), was suspended（取消）in 2007 with a worsening mood in inter-Korean relations. Saturday"s family meeting, however, came as a result of an agreement reached last month between the DPRK leader Kim Jong-il and Hyun Jeong-eun, chairwoman of South Korea"s Hyundai Group. The recovery of the family meetings is regarded as conveying the DPRK"s reconciliatory(和解) intentions, along with the country"s recent moves including lifting a ban(解禁) on cross-border traffic to and from the Kaesong Joint Industrial Park, local media said. About 600,000 South Koreans are believed to have relatives in the DPRK. Ordinary citizens were not allowed to make phone calls, send letters or exchange e-mails across the border. 小题1:. Why were there so many families separated according to the passage? A．Because they were from different countries. B．Because of the war which broke out in 1950. C．Because of the ban that ordinary citizens were not allowed to cross the border. D．Because the different policies between the two countries. 小题2:.. Which of the following statements is TRUE? A．It is the first reunion since they were separated. B．These separated families haven’t seen their relatives for more than 7 years. C．The first day of the reunion fell on a Saturday. D．Ordinary citizens are now not allowed to make phone calls, or exchange e-mails across the border. 小题3:. The underlined word “reunion” can be replaced by _______________. A．living together again B．joining together again C．reaching an agreement again D．meeting together again 小题4:. What’s the best title of this news? A．South Korean, DPRK families meet in reunion event. B．A Special Family Gathering. C．The improvement of inter-Korean relations. D．A Peaceful Meeting.
6 凯末尔第一次显露出非凡的军事指挥才能是在哪次战役中 [ ] A．马恩河战役 B．凡尔登战役 C．索姆河战役 D．达达尼尔海峡战役
7 31. They had a desire that I______ their wedding. A．attending B．attends C．attended D．attend
8 ．In the USA, one needs to make a(n) _________before seeing a doctor． A．choice B．appointment C．impression D．excuse
9 从环境保护角度考虑，下图哪个工厂的布局最不合理：（） A．电镀厂 B．发电厂 C．砖瓦厂 D．农药厂
10 下列反应的离子方程式正确的是（　　） A．向氯化亚铁溶液中通入氯气：Fe2++Cl2→Fe3++2Cl- B．向过量的氨水中滴入少量氯化铝溶液：Al3++4NH3．H2O→AlO2-+4NH4++2H2O C．向碳酸氢钙溶液中加入足量的氢氧化钠溶液：Ca2++HCO3-+OH-→CaCO3↓+H2O D．用氢氧化钠溶液吸收少量二氧化碳：2OH-+CO2→CO32-+H2O