问题 填空题

(8分)向盛有KI溶液的试管中加入少许CCl4后滴加氯水,CCl4层变成紫色。如果继续向试管中滴加氯水,振荡,CCl4层会逐渐变浅,最后变成无色。

完成下列填空:

1)写出并配平CCl4层由紫色变成无色的化学反应方程式(如果系数是1,不用填写):

2)整个过程中的还原剂是          

3)把KI换成KBr,则CCl4层变为_        _色:继续滴加氯水,CCl4层的颜色没有变化。Cl2、HIO3、HBrO3氧化性由强到弱的顺序是               

4)加碘盐中含碘量为20mg~50mg/kg。制取加碘盐(含KIO3的食盐)1000kg,若用Kl与Cl2反应制KIO3,至少需要消耗Cl2      L(标准状况,保留2位小数)。

答案

阅读理解

阅读理解。

     When Abe Lincoln was just a boy, he had to help his father Tom to look after his farm. It was hard work

and there wasn't much fun for him. Abe Lincoln wanted to go to school, but there was no school there. Abe

was sad most of the time.

     Mrs Lincoln loved the boy very much. She tried her best to make Abe happy. One morning she got up early

and said to Tom Lincoln, "I'm going to town." Tom was surprised. "That's a long way. And the snow is

heavy. What are you going to do in the town?"

     "I'll let you know when I come back," she said and then went out of the house. It took Mrs Lincoln a long

time to get to town. She bought something there and started back. And it was late in the evening when she got

home.

     The next morning Mrs Lincoln said to Abe, "Today is your birthday. We are going to have a party!" She put

some food on the table, and then brought out a present.

     "A book!" Abe cried. It was an old book, but he liked it. A smile came to his face. He looked up at Mrs

Lincoln and said, "Thank you!"

1. When he was a child, Abe Lincoln wanted to be a school _____, but there weren't any schools nearby. So

     he ______ go to school.

2. Mrs Lincoln loved her ______ and tried her best to make him happy. One morning, she wanted to go out to

    do some ______.

3. It took Mrs Lincoln a lot of ______ to______ town.

4. Mrs Lincoln ______ Abe a present. The present for Abe was a ______.

5. Abe was very ______ to have the present. He ______ it very much.

选择题