题干

现用36g水通电后完全分解,试计算 (要求写出计算过程,注意解题格式!):

可得到氢气的质量为多少?可得到氧气的质量为多少?

上一题 下一题 0.0难度 选择题 更新时间:2017-05-10 09:52:08

答案(点此获取答案解析)

解:解:设可得到H2的质量为x,可得到O2的质量为y

2H2O

同类题1

根据短文后所给的任务,完成小题.

    Mary was a little girl and she lived with her parents in Africa. Her parents had gotten tired of the neighbors always complaining to them about their daughter, who was naughty and disrespectful to others. To change the situation, the father told Mary a story of a thief who would come and take away the parents of a bad child to take care of a better child and leave the bad child alone.

    However Mary went on with her ways. One day she made fun of an old blind man on her way to school. On hearing this, her parents thought of a new plan.

    The next day Mary came back from school. To her surprise, nobody was at home. It was getting dark but neither of her parents showed up. The little girl started to wonder where they were. Suddenly she remembered the story. Mary began to cry, for she thought she would never see them again. While she was crying, the door opened and her parents came in. She ran to them and asked, “Where have you been? I thought the thief had taken you away.”

    “He did but he let us go and told us to come back home because he knows you are going to be a good girl. He told us that if you are still a bad girl, he will come back for us,” they told her.

    “I am a good girl now and I promise never to be bad again because I don't want him to take you away from me.” Mary's words made her parents very happy. From that day on, Mary has never misbehaved again.

任务一:判断下列句子正误。

任务二:回答问题。