
J2_第四章(下)空气的成分
Authored by W.Y. Tan
Science
7th Grade
Used 174+ times

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15 questions
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1.
MULTIPLE SELECT QUESTION
1 min • 1 pt
下列气体属于稀有气体的是。。。
氦气
氧气
氮气
二氧化碳
氡气
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
空气中稀有气体的体积约占_______。
21%
78%
0.94%
0.03%
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
稀有气体坐落在元素周期表里的第____族
1
5
13
18
4.
MULTIPLE SELECT QUESTION
1 min • 1 pt
下列哪一项叙述是和氮气有关?
制作各种颜色的霓虹灯
无色无味
可合成氮肥
可用来治疗癌症
不很难溶于水
5.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
a、b、从三个集气瓶中,分别盛有空气、氮气和氧气中的一种气体。用一根燃着的木枝分别插入瓶中,依次观察火焰熄灭、继续燃烧、燃烧得更旺,则瓶中所盛的气体依次是____
氧气、氮气、空气
氮气、氧气、空气
空气、氧气、氮气
氮气、空气、氧气
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
下列有关空气的说法中,正确的是___。
空气是纯净物
空气中含有各种气体
空气中不含大量微生物和尘埃
空气中各成分气体的比例经常大幅度变化
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
若空气中氮气减少,可能发生下列那种现象?
木材剧烈燃烧
食物不再腐烂
氧气大量增加
二氧化碳减少
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