试题与答案

中华人民共和国兲于严格禁止在体育运动中使用关奋剂行为规定,对运动员第一次发生时处以不

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题目:

中华人民共和国兲于严格禁止在体育运动中使用关奋剂行为规定,对运动员第一次发生时处以不少于多少年停赛?

答案:

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参考答案:(一)1个采煤工作面的瓦斯涌出量大于5m3/min或1个掘进工作面瓦斯涌出量大于3m3/min,用通风方法解决瓦斯问题不合理的。(二)矿井绝对瓦斯涌出量达到以下条件的:1.大于或等于40m3/min;2.年产量1.0~...

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My best friend has suddenly become an ex-friend and I don’t know why! Last week we phoned each other every day and emailed too. But at school on Monday she didn’t look at me or speak to me. I don’t know what I’ve done.
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45. Helen’s problem is about her ______.
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46. ______ has the same problem as Gimbya.
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题型:填空题

化学键的键能是指气态原子间形成1mol化学键时释放的能量。如:H(g)+I(g)→H-I(g)+297KJ 即H-I键的键能为297kJ/mol,也可以理解为破坏1mol H-I键需要吸收297KJ的热量。化学反应的发生可以看成旧化学键的破坏和新化学键的形成。下表是一些键能数据。(单位:kJ/mol)

阅读上述信息,回答下列问题:

(1)根据表中数据判断CCl4的稳定性_________(填“大于”或“小于”)CF4的稳定性。试预测C-Br键的键能范围_________<C-Br键能<_________

(2)结合表中数据和热化学方程式H2(g)+Cl2(g)=2HCl(g) ΔH=-QKJ/ mol;通过计算确定热化学方程式中Q的值为______________

(3)有人认为:H-O键的键能大于H-S键的键能,所以H2O的熔沸点高于H2S的熔沸点。你是否赞同这种观点?如不赞同,请说出你的解释。________________________________________

(4)①Si-Si键能小于Si-O键能的理由是:________________________________

②请写出晶体硅与氧气反应生成二氧化硅的热化学方程式:______________________________

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