问题 填空题

写出符合下列要求的物质化学式:

(1)空气中体积分数为78%的气体                                                                

(2)用植物的籽粒发酵而获得的可再生能源                                                        

(3)常温下呈液态的金属                                                         

(4)燃煤时通风不良产生的有毒气体                                                         

(5)“洁厕灵”和“漂白精”混用时会产生有毒气体Cl2,该反应的化学方程式为:NaClO+2HCl=NaCl+ Cl2 + X ,则X是                                   

答案

(1)N2

(2)C2H5OH

(3)Hg

(4)CO 

(5) H2O

选择题
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Basic Photography

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1. The shortest course is _____.[ ]

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