问题
问答题 简答题
什么是氧化还原反应？
答案
参考答案：
在化学反应过程中，如果参加化学反应的元素的化合价发生了改变，这类反应称为氧化还原反应。
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什么是氧化还原反应？
参考答案：
在化学反应过程中，如果参加化学反应的元素的化合价发生了改变，这类反应称为氧化还原反应。
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| Have you ever heard of a girl of 15, who set up a company of her own? Wendy Wong is the girl. She started the business two years ago. She has already 1 several successful computer games. They are so 2 that over half a million games are sold every year. Now all of her family work in her business, and she is 3 at school. She gets up early in the morning, and then talks with her family about the 4 over breakfast. Every day during weekdays, she goes to school in her own car with a 5 , for she is not old enough. She enjoys her school, but some of the work is too easy for her to feel 6 . She usually gets "A" grades in all her 7 . So the other students often ask her for 8 . She finished her homework in half an hour after her driver takes her home. After dinner, she goes to her office and 9 working on her computer writing games until 2 a.m. She does not usually need so much 10 as other children. | ||||
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下列实验现象描述正确的是
| 选项 | 实 验 | 现 象 |
| A | 向饱和Na2CO3溶液中通入足量的CO2气体 | 无明显现象 |
| B | 在酒精灯上加热铝箔 | 铝箔熔化，失去光泽，熔化的铝滴落下来 |
| C | 向久置于空气中的FeSO4溶液中滴加NaOH溶液 | 立刻产生大量白色沉淀 |
| D | 加热放在坩埚中的小块钠 | 钠先熔化成光亮的小球，燃烧时火焰为黄色，燃烧后生成淡黄色固体 |