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【題目】19世紀末,物理學家瑞利在研究中發(fā)現,從空氣中分離得到的氮氣密度,與從含氮物質制得的氮氣密度有0.0064 kg/m3的差異,他沒有放過這一發(fā)現,在化學家拉姆塞的合作下,經過十幾年的努力,于1894年發(fā)現了空氣中的氬氣。下列說法正確的是________(填序號)。

氬是一種化學性質極不活潑的氣體;

瑞利從空氣中分離的氮氣是純凈物;

19世紀末以前,人們認為空氣由氧氣和氮氣組成的;

瑞利發(fā)現,從含氮物質制得的氮氣密度大于從空氣中分離的氮氣的密度。

【答案】①③

【解析】

試題分析:氬是稀有氣體(惰性氣體),化學性質極不活潑;

瑞利從空氣中分離的氮氣中含稀有氣體,不是純凈物;

19世紀末以前,人們認為空氣由氧氣和氮氣組成的;

從含氮物質制得的氮氣是純凈物,而從空氣中分離的氮氣還含有密度大于氮氣的稀有氣體。所以從含氮物質制得的氮氣密度要小。

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