【单选题】We wondered __________ this afternoon.
A.
whether we would have a meeting
B.
where would we have a meeting
C.
whether we will have a meeting
D.
that we would have a meeting
【简答题】完成反应方程式: (1) Na 2 O 2 + Fe 2 O 3 熔融 (2) Na 2 O 2 + Cr 2 O 3 熔融 (3) Na 2 O 2 + MnO 4 - + H + —— (4) KO 2 + H 2 O —— (5) Na 2 O 2 + CO 2 ——
【单选题】下列离子方程式正确的是
A.
FeCl 3 溶液中滴加过量Na 2 S溶液:2Fe 3+ +S 2— ═2Fe 2+ +S↓
B.
将Na 2 O 2 固体投入H 2 18 O中:2Na 2 O 2 +2H 2 18 O=4Na + +4OH - + 18 O 2 ↑
C.
向NH 4 Al(SO 4 ) 2 溶液中滴入Ba(OH) 2 溶液,恰好使SO 4 2— 完全沉淀: NH 4 + +Al 3+ +2SO 4 2— +2Ba 2+ +4OH — = Al(OH) 3 ↓+NH 3 ·H 2 O+2BaSO 4 ↓
D.
少量CO 2 通入苯酚钠溶液中:2C 6 H 5 O — +CO 2 +H 2 O = 2C 6 H 5 OH+CO 3 2—
【简答题】下列一组有水参与的反应: ①2Na+2H 2 O=2NaOH+H 2 ↑ ②2Na 2 O 2 +2H 2 O=4NaOH+O 2 ↑ ③Na 2 O+H 2 O=2NaOH ④3Fe+4H 2 O 高温 . Fe 3 O 4 +4H 2 ⑤2H 2 O 电解 . 2H 2 ↑+O 2 ↑ ⑥2F 2 +2H 2 O=4HF+O 2 (1)其中不属于氧化还原反应的是______(填编号). (2)...
【单选题】已知2FeSO 4 +6Na 2 O 2 =2X+2Na 2 O+2Na 2 SO 4 +O 2 ↑,生成物X的化学式为( )
【单选题】Thanks for your kind help! We would have ________ lost the game!
【简答题】[A] friendly [B] direct [C] special [D] continuing
【单选题】 在双因素激励理论中,满意的对立面是()
【简答题】完成反应方程式: (1)Na 2 O 2 + Fe 2 O 3 熔融 (2)Na 2 O 2 + Cr 2 O 3 熔融 (3)