A:该溶液中K+、Fe2+、SCN﹣、Br﹣可以大量存在
B:和KI溶液反应的离子方程式:Fe3++2I﹣═Fe2++I2
C:和Ba(OH)2溶液反应离子方程式:Fe3++SO42﹣+Ba2++3OH﹣═Fe(OH)3↓+BaSO4↓
D:1L0.1 mol•L﹣1该溶液和足量的Zn充分反应,生成11.2gFe
根据下面的对话内容,从对话前的选项中选出最佳选项填入空白处,将代号填入空白处。选项中有一个多余选项。
A: It's very late. Are you still on the computer?B: Well, yes. ____ A: What kind of e-mails?B: Some are messages from my friends and some are from the relatives.A: Do you have to write them back right away?B:____ Usually people want a quick reply.A:____ B: I've already had 40 people's addresses in my address book!____ A:____ E-mail is really very convenient(方便的).
北回归线自西向东穿过我国的四个省区是( )
已知25℃、101kPa下,如图所示,石墨的燃烧热为393.5kJ/
mol,金刚石的燃烧热为395.0kJ/mol.下列说法或表达正确的是
( )