题干

Fe、Cu、Al是常见的金属元素,按要求回答下列问题:

(1)向氯化铜溶液中加入一定量的铁粉和铝粉混合物,充分反应后,下列情况可能出现的是 ____ (填编号)

a.溶液中有Cu2+、Fe2+、Al3+,不溶物为Cu

b.溶液中有Fe2+、Al3+,不溶物为Cu、Fe

c.溶液中有Fe3+、Al3+,不溶物为Cu

d.溶液中有Fe2+,不溶物为Cu、Al

(2)将一定质量的铁、铝、铜合金,加入1L 一定物质的量浓度的硝酸中,完全溶解,测得溶液中(忽略溶液体积的变化) c(H+)=0.5mol/L,c(Cu2+)=0.3mol/L,c(Al3+)=0.2mol/L,c(NO3)=2mol/L,则混合物中铁的质量为____ .

(3)在硫酸铜溶液中加入碘化钾溶液,有白色沉淀生成,溶液的颜色则由蓝色变为深黄色,经分析证明白色沉淀是碘化亚铜,该反应的离子方程式为 ____ .

(4)Li﹣Al/FeS是一种可充电电池,电池中用含Li+导电固体作为电解质,在工作过程中Li+的物质的量保持不变,其正极的电极反应式为:2Li++FeS+2e=Li2S+Fe,则电池的负极反应式为____ .充电时,阳极发生反应的物质是____ .用该电池作电源,组成如图所示装置(a、b、c、d均为石墨电极).电解后向甲中加入适量的 ____ (填物质化学式),可以使溶液恢复到原来状态,当500mL乙溶液的pH为13时,在b极上生成物质的质量为 ____ .

上一题 下一题 0.0难度 选择题 更新时间:2017-06-17 12:03:58

答案(点此获取答案解析)

ab,5.6克,2Cu2++4I=2CuI↓+I2,2Li﹣2e=2Li+,Fe,CuO或CuCO3,1.6克

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A Father and a Son

    Passing through the Atlanta airport one morning, I caught one of those shuttles that take travelers from the main terminals (航站楼) to their boarding gates. Not many people consider them fun, but on this Saturday I heard laughter. At the front of the first shuttle were a man and his son.

    We had just stopped to let off passengers, and the doors were closing again. “Here we go! Hold on to me tight!” the father said. The boy, about five years old, made sounds of happiness.

    “Look out there!” the father said to his son. “See that pilot? I bet he's walking to his plane.” The son turned his neck to look forward.

    As I was early for my flight, I decided to go back to the terminal. Where I went back again, I saw that the man and his son had returned too. I realized then that they hadn't been heading for a flight, but had just been riding the shuttle.

    “I want to ride some more!”

    “More?” the father said, mock-angry but clearly pleased. “ You are not tired?”

    “This is fun!” his son said.

    “All right.” the father replied, when a door opened, we all got on.

    There are parents who can afford to send their children to Europe or Disneyland, and there are parents who live in million-dollar houses and give their children cars and swimming pools, yet something goes wrong.

    “Where are all those people going, Daddy?” the son asked.

    “All over the world,” came the reply.

    The other people in the airport were leaving for far destinations (终点) or arriving at the ends of their journeys. The father and son, though, were just riding this shuttle together, making it exciting, enjoying being together.

    So many troubles in this country. So many questions about what to do. Here was a father who cared about spending the day with his son and who had come up with this plan on a Saturday morning.

    The answer is so simple: parents who care enough to spend time, and to pay attention and to try their best. It doesn't cost a cent, yet it is the most valuable thing in the world.

    The shuttle picked up speed, and the father pointed something out, and the boy laughed again.