认识氧气 Flashcards

1
Q

木炭在空气中点燃的反应现象是什么?

A

木炭持续红热,生成能使澄清石灰水变浑浊的气体。

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2
Q

木炭在点燃条件下,在氧气中反应的现象是什么?

A

燃烧更旺,发白光,放热,生成能使澄清石灰水变浑浊的气体。

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3
Q

木炭燃烧的生成物是什么?

A

二氧化碳

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4
Q

铁丝在空气中燃烧的现象是什么?

A

加热时城红热状,离火后变冷。

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5
Q

铁丝在氧气中燃烧的现象是什么?

A

剧烈燃烧,火星四射,放热,生成黑色固体。

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6
Q

铁丝燃烧的生成物是什么?

A

四氧化三铁

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7
Q

硫在空气中燃烧的现象是什么?

A

发出微弱的淡蓝色火焰,放热,生成有刺激性气味的气体。

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8
Q

硫在氧气中燃烧的现象是什么?

A

发出明亮的蓝紫色火焰,放热,生成有刺激性气味的气体。

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9
Q

硫燃烧的生成物是什么?

A

二氧化硫

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10
Q

石蜡在空气中燃烧的现象是什么?

A

黄白色火焰,放热,稍有黑烟。

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11
Q

石蜡在氧气中燃烧的现象是什么?

A

燃烧更旺,发白光,放热,瓶壁有水雾,生成能使澄清石灰水变浑浊的气体。

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12
Q

石蜡燃烧的生成物是什么?

A

二氧化碳和水

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13
Q

氧气的化学性质稳定还是活泼?

A

活泼

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14
Q

常见的氧化剂有什么?

A

氧气

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15
Q

氧气的物理性质是什么?

A

是一种无色、无味的气体,在标准情况下,密度比空气略大,不易溶于水。

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16
Q

四大基本反应类型有哪些?

A

化合反应、分解反应、置换反应、复分解反应。

17
Q

氧化反应是基本反应类型吗?

A

不是。

18
Q

氧气可以用来炼钢、气焊和切割金属吗?

A

可以

19
Q

红磷在空气中燃烧,发出白光,生成大量的白色烟雾,这句话错在哪里?

A

不能说烟雾。

20
Q

什么气体可以用于食品保鲜?

A

氮气

21
Q

臭氧属于单质吗?

A

属于