【简答题】用符号∈或∉填空。(2,3) {(1,2),(2,3)}
【单选题】有下列三个反应: ①Cl 2 +FeI 2 FeCl 2 +I 2 ②2Fe 2+ +Br 2 2Fe 3+ +2Br - ③Co 2 O 3 +6HCl 2CoCl 2 +Cl 2 ↑+3H 2 O, 下列说法中正确的是( )
A.
①②③中氧化产物分别是FeCl 2 、Fe 3+ 、Cl 2
B.
根据以上方程式可以得到氧化性Cl 2 >Co 2 O 3 >Fe 3+
C.
在反应③中生成1 mol Cl 2 时,有2 mol HCl被氧化
D.
根据反应①②一定可以推理得到Cl 2 +FeBr 2 FeCl 2 +Br 2
【单选题】He ________ his way through the crowd and followed her.
【简答题】Brian arrived at the San Francisco airport two hours before the flight to Paris. He was wearing three shirts, a jacket, two pairs of socks, a pair of shorts, and two pairs of jeans. He was carrying on...
【单选题】已知2SO 2 +O 2 2SO 3 为放热反应,对该反应的下列说法中正确的是 [ ]
C.
SO 2 和O 2 的总能量一定高于SO 3 的总能量