（8分）在25℃时，向100 mL含氯化氢14.6 g的盐酸溶液里放入5.6 g纯铁粉（不考虑反应前后溶液体积的变化），反应开始至2 min末收集到氢气1.12 L（标况），在此之后，又经过4 min铁粉全部溶解。则：
（1）在前2 min内用FeCl2表示的平均反应速率是多少？
（2）在后4 min内用HCl表示的平均反应速率是多少？
（3）前2 min与后4 min相比，反应速率哪个较快？为什么？试解释原因。
⑴0.25 ⑵0.25
⑶前2分钟快 随着反应的进行，盐酸浓度降低，反应速率减慢。
| 根据短文内容，用方框所给词的适当形式填空。 | |
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| Last spring I was walking in a park. In front of me there was a mum and her 3-year-old daughter. The little girl was holding a string（线）,which had a balloon at the other 1 . All of a sudden, a 2 wind took the balloon from the little girl. I thought she would cry. But, no! As the little girl turned to watch her balloon rise to the 3 , she cheerfully shouted out, "Wow!" That little girl 4 me something. Later that day, I received a phone call from my friend, whotold me an unexpected problem. I felt like 5 with "Oh no, what should we do?” But remembering that little girl, I found 6 saying, “Wow, that is interesting! How can I help you?" One thing is for sure-life is always going to make us 7 unexpected problems. However, how to deal with them is our choice. We can choose to be annoyed or 8 . No matter what the situation is, a "Wow!" will always 9 "Oh, no." So the next time you meet one of life’s unexpected 10 , remember that little girl and make it a " Wow!" experience. The "Wow!" always works. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. |