【題目】空氣中含量最多的氣體是________；澄清石灰水露置在空氣中會逐漸變渾濁，這說明空氣中有少量的________；盛有冰水的杯子，放在常溫的空氣中，外壁會潮濕，說明空氣中有________；將一只老鼠放入一個密封的玻璃瓶內(nèi)，過一段時間，老鼠才會死亡，說明空氣中有________。

【答案】氮氣(或N2) 二氧化碳(或CO2) 水蒸氣(或H2O) 氧氣(或O2)

【解析】

試題分析：空氣中含量最多的氣體是氮氣(或N2)；二氧化碳(或CO2)能使澄清石灰水變渾濁；盛有冰水的杯子，放在常溫的空氣中，外壁會潮濕，是因為空氣的水蒸氣(或H2O)遇冷冷凝面成；將一只老鼠放入一個密封的玻璃瓶內(nèi)，過一段時間，老鼠才會死亡，說明空氣中有一定量的氧氣(或O2)。

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