下列关于电解池的叙述中正确的是( )
A．电解池中的闭合回路仅是由电子的定向移动形成的
B．金属导线中,电子从电源的负极流向电解池的阳极,从电解池的阴极流向电源的正极
C．在电解质溶液中,阴离子向阴极运动,阳离子向阳极运动
D．相同时间内,阳离子在阴极上得到的电子与阴离子在阳极上失去的电子数相等
答案：D
在电解池中,外电路上是靠电子的定向移动形成电流,而电解质溶液中是靠阴、阳离子的定向移动而形成电流,因此A项错误。在电解池中,电子由电源的负极流向电解池的阴极,由电解池的阳极流向电源的正极;在电解质溶液中,阴离子向着阳极移动,阳离子向着阴极移动,因此B、C两项都错误,只有D项正确。
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| Lucy lives in the Zhongshan Road. She_1 in the No.6 Middle School. Every day she gets up early and goes to school early. Her home is a little far_2 her school. So she usually _3_ a bus. _4 the bus stop there is a fruit shop. It sells different_5_. Lucy often buys_6_in it and she is good at_7_fruit. From the bus stop she walks along the Nanjing Road. Then she takes the third turning_8_the right. Her school is_9_ 50 metres. _10_it there is a park. | ||||
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