【单选题】已知 Sn 4+ /Sn 2+ =0.15V , Cu 2+ /Cu =0.34V , Fe 3+ /Fe 2+ =0.77V , Cl2/Cl - =1.36V 在标准状态下能自发进行的反应是
A.
Cl 2 +Sn 2+ ® 2Cl - +Sn 4+
B.
2Fe 2+ +Cu 2+ ® 2Fe 3+ +Cu
C.
2Fe 2+ +Sn 4+ ® 2Fe 3+ +Sn 2+
D.
2Fe 2+ +Sn 2+ ® 2Fe 3+ +Sn 4+
【单选题】Boy:How do you like your new school? Girl:I’m feeling great in my mew school. There are many interesting subject here. ( ) What’s the girl’s attitude towards her new school life?
【简答题】词形填空。 1. How many ______ (teacher) are there in your school? 2. I have three _______( watch ). 3. There are some _______( orange) on the table. 4. Tom is a little _______ ( strong) than Mike. 5. I thi...
【单选题】土壤速效钾含量的测定,采用的方法是( )。
【单选题】已知 φ 0 ( Fe 3+ /Fe 2+ ) = 0.77V , φ 0 ( Cu 2+ / Cu + ) = 0.15V , 则反应 Fe 3+ + Cu + D Fe 2+ + Cu 2+ 的平衡常数 K 为
【简答题】How many principles are there in subject-verb concord?
【简答题】In the current economic downturn, many American schools are adding a new subject to the curriculum(课程); financial literacy. One program in Virginia even gets students out of the classroom for a day to...
【单选题】Boy:How do you like your new school? Girl:I’m feeling in my mew school. There are many interesting subject here. ( ) What’s the girl’s attitude towards her new school life?