Cl2通入70℃的氢氧化钠水溶液中，能同时发生两个自身氧化还原反应（未配平）： NaOH + Cl2 → NaCl + NaClO + H2O，NaOH + Cl2 → NaCl + NaClO3 + H2O。
反应完成后测得溶液中NaClO与NaClO3的数目之比为5：2，则该溶液中NaCl与NaClO的数目之比为
A．3∶1
B．2∶1
C．15∶2
D．1∶1
答案：A
假设生成5molNaClO，失去5mol电子，生成2molNaClO3，失去10mol电子，共失15mol电子，生成NaCl得1mol电子，即生成了15molNaCl。故为15:5=3:1。
Directions: Complete the passage with the words in the box.. Each word can only be used once. Note that there is one word more than you need.
Psychologist Dr. Robert Sinclair recently conducted a series of four studies 小题3: the effects of experimentally induced ( 诱发的 ) happiness versus sadness on work 小题4: by asking the participants to build circuit boards. In the first study, sad people committed 小题5: few errors than did happy people, but there was no difference in the number of boards 小题6: . In similar studies Sinclair found the same results along with the evidence that happy people might not 小题7: as much energy to the task in order to maintain their happy moods ---- they considered that task as something that might detract from their 小题8: feelings. These findings are not surprising, said Sinclair, since there has been a growing body of literature in the area of social psychology 小题9: that sad moods lead to more calm lengthy intent consideration and often, more thought or accurate judgments. So it’s important for organizations to take into account the 小题10: of their employees. It seems it could be beneficial to creating situations that lead people to believe that performing their jobs will cause them to feel good. |