初中化学家庭小实验

找4个初中的化学家庭小实验,谢谢~
2025-01-21 17:55:40
推荐回答(5个)
回答1:

在厨房里找到下列物品:
食醋(含有3—5%的醋酸
,最好是无色透明的白醋,这样便于观察现象,白醋含有6%醋酸)
苏打(主要成分是na2co3,做发面馒头要用的)或小苏打(主要成分是nahco3)
将苏打慢慢加入到事先倒入食醋的玻璃杯中,会有大量气体放出,产生大量泡沫,像啤酒倒出时的样子(加快了,泡沫可能会溢出)。
我上中学时经常在家做这个实验玩哦。反应方程式如下:
2hoac
na2co3
==
2naac
h2o
co2(气体)

hoac
nahco3
==
naac
h2o
co2(气体)
呵呵,哥再教你一招:
到药房里买一瓶外用消毒的双氧水,找个小药瓶,例如用完的眼药水瓶,装入半瓶双氧水,然后将少许香烟灰粉末加入小药瓶里;擦燃一根火柴,将火焰熄灭,把带火星的火柴梗伸入小药瓶里,可以看到火柴梗又复燃了!这是因为香烟灰可以起到催化剂作用,加速双氧水的分解,而双氧水分解生成水和氧气,氧气有助燃作用,可使带火星的火柴梗(或者点燃的卫生香、蚊帐)燃起明亮的火焰。反应式如下:
2h2o2==香烟灰催化==2h2o+o2(气体)
(至于香烟灰,你可以向抽烟的家人或邻居弄一点,实在找不到香烟灰,加点随处可见的尘土也可以作为催化剂哦,可别为了做这个小实验而去学抽烟啊!)
此外,我还摘抄到另外一个适合在家做的化学实验。
蔬菜中维生素c的测定
【实验原理】
淀粉(用面粉也可)溶液遇到碘会变成蓝紫色,这是淀粉的特性。而维生素c有还原性,能与蓝紫色溶液中的有氧化性的碘发生作用,使溶液变成无色。通过这个原理,可以用来检验一些蔬菜中的维生素c。
【实验步骤及现象】
在玻璃瓶内放少量淀粉,倒入一些开水,并用小棒搅动成为淀粉溶液。滴入2~3
滴碘酒,你会发现乳白色的淀粉液变成了蓝紫色。再找2
~3
片青菜,摘去菜叶,留下叶柄,榨取出叶柄中的汁液,然后把汁液慢慢滴入玻璃瓶中的蓝紫色的液体中,边滴入边搅动。这时,你又会发现蓝紫色的液体又变成了乳白色。说明青菜中含有维生素c。

回答2:

火山爆发。
方法:可以用淀粉堆一个山,在山头挖个洞,拿番茄酱,樱桃酱往里填。加入小苏打,再倒很多醋,由于产生co2,气泡冒出,把红色的酱往外顶,像岩浆。
实验用品:苏打水,淀粉,醋,果酱(红色)
还有淬火和回火
把铁针在火上加热,直接放入水中是淬火,慢慢冷却是回火.

回答3:

“蛋壳溶于食醋放出气体”实验器具:烧杯、镊子
药品:食醋、蛋壳
实验过程:1.将食醋沿杯壁缓慢地倒入烧杯至烧杯的3/5处(这个数据凭自己的感觉写)
2.取少量蛋壳,用镊子放入烧杯,注意不要让试液溅出
3.静置并观察现象
实验现象:蛋壳一开始沉到杯底,后表面逐渐出现小气泡,小气泡逐渐密集并变大,蛋壳开始缓慢且“摇摇晃晃”地上浮。过一段时间后,蛋壳逐渐变小。
实验结论:蛋壳可溶于食醋并放出气体(这句话要看题目的意思再写)
还有实验室制取氧气什么的,多了

回答4:

1.蛋壳溶于食醋放出气体
2.小苏打/苏达溶液加入食醋放出气体
3.V酒精+V水 不等于V(酒精+水)
4.用铅笔中的石墨做导电试验

回答5:

1.蛋壳溶于食醋放出气体
2.小苏打/苏达溶液加入食醋放出气体
3.V酒精+V水 不等于V(酒精+水)
4.用铅笔中的石墨做导电试验
5墙壁中的Caco3会与空气中的气体反应
6用花瓣做酸碱指示剂

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