问题
选择题
对于在密闭容器中进行的反应：N2+O2
2NO，下列不能加快该反应的反应速率的条件是（ ）
A．缩小体积
B．充入更多的NO
C．体积增大到原来的2倍
D．升高温度
答案
答案：C
体积增大到原来的2倍，浓度减小为原来的
，化学反应速率减小。
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对于在密闭容器中进行的反应：N2+O22NO，下列不能加快该反应的反应速率的条件是（ ）
A．缩小体积
B．充入更多的NO
C．体积增大到原来的2倍
D．升高温度
答案：C
体积增大到原来的2倍，浓度减小为原来的，化学反应速率减小。
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| The Internet has become an important part of teenage life. Most of them use the Internet to get lots of knowledge and 1 . The teenagers keep in touch with their friends online. It's 2 than phoning someone far away and e-mail is 3 much quicker than ordinary mail. But some teenagers are not using it 4 the right way. Some of them would find life difficult without it. Some teenagers spend 5 time online. Some of the students who used to do well at school are now failing in exams because now they spend most of their 6 playing games online. It is 7 for teenagers to use the Internet properly. They should learn 8 to use the Internet for study and keep away from 9 websites. They should make sure that surfing the Net doesn't 10 their homework or being with their friends. | ||||
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