作者:admin 日期:2023-11-03 17:06:09 浏览:54 分类:生活
实验现象:红磷在氧气中燃烧会产生剧烈燃烧,并发出白光,放出热量,生成大量的白烟。燃烧的文字表达式:红磷+氧气——点燃→五氧化二磷。化学方程式:4P+502=2P205。产生物质:五氧化二磷。
首先,在集气瓶里加入少量的水,并做上记号,用弹簧夹夹紧乳胶管。点燃燃烧匙内的红磷后,立即伸入瓶中并把塞子塞紧。观察红磷燃烧的现象。待红磷熄灭并冷却后,打开弹簧夹,观察实验现象及水面的变化情况。
燃烧会生成五氧化二磷固体,用手摸集气瓶,感觉热,因此红磷燃烧,放出热量,有大量白烟生成燃烧后,集气瓶中气体减少,氧气占空气的1/5,故有水进入集气瓶,且进入得水约占集气瓶总容积的1/5。
实验现象:在空气中燃烧会出现黄白色火焰,放热,有大量白烟。产生了五氧化二磷,五氧化二磷颗粒飘在空气中就是现象的白烟。红磷燃烧生成大量白烟, 这个白烟是五氧化二磷。
在空气组成实验中,红磷与氧气反应生成五氧化二磷(磷酸),这一过程体现在以下几个方面: 反应现象:当红磷与氧气反应时,会产生明亮的火焰和白色的烟雾。这是因为五氧化二磷是固态,通常以白色粉末的形式出现。
1、铁生锈是氧化反应。酒越久越香是酯化反应。红药水和碘酒不能同时使用是氧化还原反应。鸡蛋放在醋里会冒泡是醋酸和碳酸钙反应生成二氧化碳。水银温度计打碎了撒些硫磺,是硫与汞反应生成硫化汞。
2、身边的化学现象有:液化石油气的燃烧;木炭、稻草和柴火的燃烧;煤、油的燃烧;酒的酿造;麦芽糖的制作;施肥后蔬菜、花草的生长;动物尸体的腐烂;铁的生锈;食物的腐烂;洗涤剂的使用。
3、我们的生活中存在许多化学现象,以下是一些常见的例子: 燃烧:燃烧是指物质与氧气发生化学反应产生能量、释放光和产生新的物质。例如,蜡烛燃烧时蜡燃料与空气中的氧气反应,产生二氧化碳和水蒸气,释放出光和热能。
产生明亮的火焰:红磷在氧气中燃烧时会发出明亮的火焰。这是因为红磷的燃烧反应非常剧烈,产生大量的热能,这些热能转化成了光能,使得火焰明亮。例如,实验室中点燃红磷以完成燃烧实验,可以看到其发出明亮的火焰。
【实验现象】① 红磷燃烧,产生大量白烟;② 放热;③ 冷却后打开弹簧夹,水沿着导管进入集气瓶中,进入集气瓶内水的体积约占集气瓶空气总体积的1/5。
红磷在氧气中的燃烧(暗红色固体)实验现象:剧烈燃烧,发出白光,放出热量,生成大量的白烟。文字表达式:磷(P)+氧气(O2)点燃——→五氧化二磷(P2O5)空气中燃烧情况:黄白色火焰,放热,有大量白烟。
1、化学与生活有着密切的关系,生活中有许多现象都可以用化学原理进行分析与解释。
2、不粘锅之所以不粘食物,是因为锅底涂上了一层特殊物质:“特富隆”,其化学名叫聚四氟乙烯,俗名叫塑料王。剧烈运动后,感觉全身酸痛,这是因为肌肉中增加了乳酸。
3、.不粘锅之所以不粘食物,是因为锅底涂上了一层特殊物质:“特富隆”,其化学名叫聚四氟乙烯,俗名叫塑料王。
4、其化学名叫聚四氟乙烯,俗名又叫塑料王。切苹果和梨子等水果时准备一点百分之十左右的盐水,切好后放在盐水里泡一下,可以防止水果变色,因为水果中有较活泼的铁离子会和空气中的氧发生化学反应。
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