【单选题】下列各微粒,具有相同的质子数和电子数的是( )
C.
H 3 O + NH 4 + Na + H 2 F +
【单选题】下列能正确表示水解的离子方程式是
A.
CH 3 COOH + H 2 O CH 3 COO - + H 3 O +
B.
NH 4 + + H 2 O NH 3 ·H 2 O + H +
C.
CO 3 2- + 2H 2 O H 2 CO 3 + 2OH -
D.
Br - + H 2 O HBr + OH -
【单选题】以色列和巴勒斯坦都把哪个城市定为首都 [ ]
【单选题】CH 4 、NH 3 、H 2 O、HF分子中,共价键的极性由强到弱的顺序是( )。
【单选题】"Maggie, Barbara, I'd like to introduce our new colleague Laura." Maggie:" Hi, Laura, welcome to the office." Barbara:"Welcome, please let us know if there is anything we can do for you." Laura: "____...
B.
It's lovely to meet you both.
【单选题】以色列和巴勒斯坦都把其定为首都的城市是( )
【单选题】— Do you know Laura’s address? — _____________. As a matter of fact, I don’t know any Laura, either.
【单选题】CH 4 、NH 3 、H 2 O和HF中,共价键的极性由强到弱的顺序是 [ ]
【单选题】以色列和巴勒斯坦都把哪一城市定为首都 [ ]
【单选题】下列各组物质全部是弱电解质的是
B.
MgSO 4 CH 3 COOH CH 3 CH 2 OH
D.
H 2 O NH 3 ·H 2 O H 3 PO 4