人教版九年级上册《化学》36页第五题答案

2025-01-24 02:28:05
推荐回答(4个)
回答1:

1.无色无味的气体。用途:助燃,帮助呼吸等。
2.铁在纯氧中可以燃烧,在氮气中则不会。
3.S+ O2 = SO2
2 P+5 O2 =2 P2O5
3 FE + 2 O2 = Fe3O4

回答2:

1、氧气是助燃气体,本身不能燃烧。它可以帮助其他易燃物品燃烧,我们人类也是每天都需要它。
2、在进行钢铁焊接时,需要隔绝氧气才能进行工作,在焊接时就要通过充入氮气来达到隔绝氧气的方法。
3、硫和氧气点燃生成二氧化硫
红磷和氧气点燃生成五氧化二磷
鉄和氧气点燃生成四氧化三铁

回答3:

咦。。我的化学书和你的题目和你滴一样= =
偶们老师正好昨儿刚讲完这里。。。(巧)
1:氧气的物理性质:在标准状况下,氧气是一种无色无味的气体,在压强为101KPa,温度在-183℃时变成淡蓝色液体,在-218℃时变成淡蓝色雪花状的固体,密度是1.429g/L,比空气的密度(1.293g/L)略大,它不易溶于水,在温室下,1L水中只能溶解30mL氧气。氧气的化学性质:氧气是一种化学性质比较活泼的气体,在反应中提供氧,具有氧化性。用途:冶金工业 在炼钢过程中吹以高纯度氧气,氧便和碳及磷、硫、硅等起氧化反应,这不但降低了钢的含碳量,还有利于清除磷、硫、硅等杂质。化学工业 在生产合成氨时,氧气主要用于原料气的氧化。.国防工业 液氧是现代火箭最好的助燃剂,在超音速飞机中也需要液氧作氧化剂,可燃物质浸渍液氧后具有强烈的爆炸性,可制作液氧炸药。医疗保健方面:供给呼吸:用于缺氧、低氧或无
氧环境。
2:带火星的木条在氧气中复燃,但在氮气中不复燃,由此可知,氧气的化学性质比较活泼,能够支持燃烧,有助燃性,但氮气的化学性质不活泼,不支持燃烧。
点燃 点燃
4:硫+氧气→二氧化硫(S+O2→SO2)淡蓝色的火焰变成紫蓝色的火焰
点燃 点燃
红磷+氧气→五氧化二磷(P+O2→P2O5)有黄色火焰,产生大量白烟,放出大量的热
点燃 点燃
铁+氧气→四氧化三铁(Fe+O2→Fe3O4)剧烈燃烧,火星四射。
呼呼。。完了。。累死我了。。望采纳~~O(∩_∩)O~

回答4:

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