[Urea Knowledge] Daily Question (15) 2010.01.04
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This post was last edited by shiguomiao on 2010-1-4 01:54. Please hide the answers in replies; no scoring will be given unless the answers are hidden. Specific hiding method: http://bbs.hcbbs.com/viewthread.php?tid=492556&highlight=%D2%FE%B2%D8 1. The relationship between temperature and the dehydration of methylammonium: ( ) A. The higher the temperature, the faster the dehydration of methylammonium. B. The higher the temperature, the slower the dehydration of methylammonium. C. There is no relationship between temperature and the dehydration of methylammonium. D. There is a maximum temperature for the dehydration of methylammonium. 2. The reaction between urea and formaldehyde produces ( ) A. Methylurea B. Methylenediurea C. Urea-formaldehyde resin D. Urotropin. 3. In chemical production, heating is generally achieved using ( ) A. Superheated steam B. Saturated steam C. Steam condensate D. Wash water. A B B
1.A 2.B 3.B
1. The relationship between methylammonium dehydration and temperature: (A) A. The higher the temperature, the faster the dehydration of methylammonium. B. The higher the temperature, the slower the dehydration of methylammonium. C. Temperature has no effect on the dehydration of methylammonium. D. There is a maximum temperature for methylammonium dehydration. 2. The reaction between urea and formaldehyde produces (B): A. Methylurea. B. Methylenediurea. C. Urea-formaldehyde resin. D. Urotropin. 3. In chemical production, heating is generally carried out using (B): A. Superheated steam. B. Saturated steam. C. Steam condensate. D. Wash water
Answer: 1. A, D 2. B 3. B 1# shiguomiao