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【简答题】
讨论下列反应动力学：S 2 O 8 2－ +2I － →2SO 4 2－ +I 2 。在24℃，混合25mL、摩尔数为n 1 的KI溶液，5mL、0.2%的淀粉溶液与10mL、1×10 －2 mol•L －1 的硫代硫酸钠溶液。在时间t=0时，向上述的混合液中，加入含有过二硫酸根离子S 2 O 8 2－ 摩尔数为n 2 的溶液25mL。由实验中n 1 和n 2 的不同取值测出溶液显出蓝色的时间间隔Δt。 碘被硫代硫酸盐还原是极快的，并且认为测出的时间是足够得短，以致可用 来表示反应的初始速率。 （1）写出相应实验完成的化学反应式，解释蓝色出现的原因并指出在这个时候（I－）值是与在时间t=0时一样，并且[S 2 O 8 2－ ]的变化不大（见下表）。 （2）写出速率表达式。 （3）根据上面5个实验数据计算出速率常数k值并求出其平均值。
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举一反三
【简答题】A fight between the opposing teams _____ during the .
【单选题】When the variable is adjusted during the game play, its value will
A.
Not hold after the game stops
B.
Hold after the game stops
C.
Be reset to zero after the game stops
D.
Be saved automatically
【单选题】What do officials do during the game of football?
A.
Watch the game.
B.
Take up tickets.
C.
Make sure the rules are followed.
D.
Kick the ball.
【单选题】During the game, all athletes were competing _______the medal.
A.
with
B.
for
C.
against
D.
on
【简答题】Estimate, in millions of pounds, the amount of potato chips eaten during the
【单选题】Why did Chirs introduce the company's financial programs to Mr. Ribbon during the game?
A.
Because Mr. Ribbon was looking for some better products than Morgan Stanley's.
B.
Because he thought Mr. Ribbon could be a big potential client to him.
C.
Because Mr. Ribbon trusted him.
D.
Because Chris made the appointment to meet Mr. Ribbon at the game.
【单选题】In the game theory, the cognitive process involves speculating what other people are thinking during the game. Which of the following part may be LEAST related to this process?
A.
The lateral occipital sulcus
B.
The rTPJ (Right Temporoparietal Junction)
C.
The MPFC (Medial prefrontal cortex)
D.
The STS (Superior temporal sulcus)
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