[Urea Knowledge] Daily Question (101) 2010.04.11
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Hide the answers; no scoring will be given in principle if they are not hidden. Specific hiding method: http://bbs.hcbbs.com/viewthread.php?tid=492556&highlight=%D2%FE%B2%D8 Fill-in-the-blank questions: 6. The chemical name of urea is ( ), and its structural formula is ( ). 7. The molecular weight of urea is ( ), and the ammonia content in pure urea is ( ) (by mass). 8. Heat exchangers are classified by structure as: ( ). 9. Heat exchangers can be divided into ( ) and ( ) based on the different transfer processes. 10. There are three basic ways of heat transfer ( ). Answer to the reply: 6. The chemical name of urea is (carbamidium), and its structural formula is (CO(NH2)2). 7. The molecular weight of urea is (60.06), and the ammonia content in pure urea is (46.66%) (by mass). 8. Heat exchangers can be classified by structure into: (tubular heat exchangers, plate heat exchangers, exchanger with extended surfaces, and regenerative heat exchangers). 9. Heat exchangers can be classified into two types according to the heat transfer process: (direct contact type) and (indirect contact type). 10. There are three basic ways of heat transfer: conduction, convection, and radiation.
This post was last edited by wal5980729 on 2010-4-10 20:48. 6. The chemical name of urea is (carbamidodiamine), and its structural formula is (CO(NH2)2). 7. The molecular weight of urea is (60.06), and the ammonia content in pure urea is (46.66%) (by mass). 8. Heat exchangers can be classified by structure into: (tubular heat exchangers, plate heat exchangers, exchanger with extended surfaces, and regenerative heat exchangers). 9. Heat exchangers can be classified into two types according to the heat transfer process: (direct contact type) and (indirect contact type). 10. There are three basic ways of heat transfer: conduction, convection, and radiation. 1# Heart Juice
6. The chemical name of urea is (urea or carbamide), and its structural formula is (NH2CONH2). 7. The molecular weight of urea is (60.056), and the ammonia content in pure urea is (46.65) (by mass). 8. Heat exchangers are classified by structure into: (vertical, horizontal). 9. Heat exchangers can be classified into two types according to the different transfer processes: (direct mixing type) and (jacketed type). 10. There are three basic ways of heat transfer: heat conduction, convective heat transfer, and radiative heat transfer.
6. Carbamide, (NH2)2CO； 7, 60.06, 46.65% ； 10. Heat conduction, convection, thermal radiation ；
6. Carbodiimide, CO(NH2)2 7. 60.06 46.66% 8. Tubular heat exchangers, plate heat exchangers, extended surface area heat exchangers, regenerative heat exchangers 9. Direct contact, indirect contact 10. Heat conduction, convection, radiation
6. The chemical name of urea is (carbamidine), and its structural formula is (CO(NH2)2). 7. The molecular weight of urea is (60), and the ammonia content in pure urea is (46.7%) (by mass). 8. Heat exchangers can be classified by structure as: shell-and-tube type, double-pipe type, tube-in-tube type, plate type, floating-head type, etc. 9. Heat exchangers can be divided into two categories based on the transfer process: (convection) and (condensation). 10. There are three basic ways of heat transfer (convection, radiation, conduction).
6. The chemical name of urea is (carbamidium), and its structural formula is (CO(NH2)2). 7. The molecular weight of urea is (60.06), and the ammonia content in pure urea is (46.66%) (by mass). 8. Heat exchangers can be classified by structure into: (tubular heat exchangers, plate heat exchangers, exchanger with extended surfaces, and regenerative heat exchangers). 9. Heat exchangers can be classified into two types according to the heat transfer process: (direct contact type) and (indirect contact type). 10. There are three basic ways of heat transfer: conduction, convection, and radiation.
6. Carbon diammonium carbonate CO(NH2)2 7.60.06, 46.66% 8. Tubular heat exchangers, plate heat exchangers, surface-area enhanced heat exchangers, regenerative heat exchangers 9. Direct contact, indirect contact 10. Heat transfer: convection, radiation
6. The chemical name of urea is (carbamidium), and its structural formula is (CO(NH2)2). 7. The molecular weight of urea is (60.06), and the ammonia content in pure urea is (46.66) (by mass). 8. Heat exchangers can be classified by structure into: tubular heat exchangers, plate heat exchangers, extended surface heat exchangers, and regenerative heat exchangers. 9. Heat exchangers can be classified into two types according to the transfer process: (direct contact type) and (indirect contact type). 10. There are three basic ways of heat transfer: conduction, convection, and radiation.
O II 6. The chemical name of urea is (carbamidine), and its structural formula is (NH2---C---NH2). 7. The molecular weight of urea is (60.06), and the ammonia content in pure urea is (46%) (by mass). 8. Heat exchangers are classified by structure into: (tubular type, plate type). 9. Heat exchangers can be classified into two types based on the different heat transfer processes: (convection heat transfer) and (conduction heat transfer). 10. There are three basic ways of heat transfer ( ).
6. The chemical name of urea is (carbamidium), and its structural formula is (CO(NH2)2). 7. The molecular weight of urea is (60.06), and the ammonia content in pure urea is (46.66%) (by mass). 8. Heat exchangers can be classified by structure into: (tubular heat exchangers, plate heat exchangers, extended surface heat exchangers, and regenerative heat exchangers). 9. Heat exchangers can be divided into two categories based on the transfer process: (direct contact type) and (indirect contact type). 10. There are three basic ways of heat transfer (conduction, convection, radiation)