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电解一价阳离子成为金属在阴极上析出时，若电解至尚剩下0.01%时视为已电解完全，则阴极电位值的变化为多少？
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A.Her present was a surprise to him,B.He had hoped the gift would surprise her.
Questions 下列各 are based on the following passage. The ownership of pets brings a variety of benefits that the uninitiated would never believe．For every tale of shredded cushion，flattened plants，and chew slippers，there is another testimony of intelligence，sympathy and undying devotion．Now the gowing body of research into the medical and social advantages of pet ownership has confirmed what pet owners have always intuitively known that pets are not just loving companions but actually do us good．Researchers have established the value of pets in soothing and reassuring humans，particularly when ill，lonely or in distress．Perhaps the unquestioning love and approval pets give us is something we don’t always get from out human nearest and dearest． Our makeshift understanding psychology leads many of us to view very close relationships with pets with suspicion．Childless couples in particular give rise to speculation，but a consultant in animal behavior. says，“There is no evidence that a pet is a direct substitute for child．”And while many adults feel foolish if caught talking to their pets，they have no need to．The experts say you cannot have a close relationship with a pet without treating it as a person and that talking to a pet is notun healthy．—simply a way of establishing camaraderie． The shaking helplessness of a young puppy or fluffy kitten stirs protective instincts deep within us and prompts many parents to buy pets for their children in the hope of instilling a sense of responsibility and caring and acceptance of the facts of life and death．Hut animals don’t have to besoft and fond to bring out the best in us．A social worker encouraged aggressive boys to handle ferrets—“if handled correctly they respond with friendship；if incorrectly they bite．” There seems to be no doubt that，emotionally and physically,our pets do us good—there is a Drice to be paid．When loved animal dies，it is often a traumatic event—and then where do we tum for comfort？ Pets are sometimes criticized because they_______．
某卤代物在滴汞电极上还原产生的极谱波为
RX+H++2e-=RH+X-
已知在普通的极谱仪上测得的半波电位为-1.589V(25℃)，若用单扫描极谱法测定该化合物，其峰电位为多大？若此化合物能可逆氧化，其循环伏安图上的阳极峰电位约为多大？
用极谱法分析测定某0.200 g试样中Zn2+的质量分数。在0.1 mol·L-1NH3-NH4Cl溶液中加入0.05%的动物胶及0.5%Na2SO4除氧，测得试样的极限扩散电流为41.7μA。与试样作同样处理的标准Zn2+的质量及波高如下。计算试样中Zn2+的质量分数。
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