推荐回答(4个)
1.俯视药液
2.先放平试管,把物体放在试管口处,慢慢竖起试管,使物体缓缓滑落到试管底
3.因为手上常常会有汗液,由于砝码非常精密,所以怕腐蚀。
4.遵循一个原则:左物右码。因为游码是往右移动的,如果不小心把物体放在右盘中,在移动游码的情况下称出来的质量比实际质量大。
5.好像是与氧气接触吧?(不确定)
6.在手的的温度比周围空气气温高时,可用双手紧紧捂住试管,如果装置不漏气,那导管通向水槽另一头会有气泡冒出。(因为热胀冷缩)在周的温度与皱为空气温度差不多时,可改用酒精灯。
7.试管斜放,用酒精灯外焰加热
8.因为如果长柄短柄都握,万一用力,那试管就会从试管夹上脱落下来。
9.(这个不知道,呵呵~)
10.
11.
12.
13.
我也是刚接触化学,我回答出来的就应该没问题了,有一些不会,不好意思了~~~
1.戴上防护眼睛
2.倾斜试管缓缓放入,或者把大块切小
3.手上有水分或其他脏东西,会使砝码污染或生锈影响测量准确度
4.如果不使用游码没影响,用了则 实际重量=砝码质量-游码指数
5.外焰与氧气接触充分,反应完全
6.把装置放到水里,冒泡就是不严密
7.夹着试管在酒精灯上面来回移动
8.如果按在短的上面可能使试管松动,落到地上
9.直接加热:直接放火上烧;间接加热:水浴或者油浴
10.题目有问题
11.电炉,酒精喷灯,乙炔灯
12.在瓶子里反应,然后用2楼的方法:带火星的木条检验CO2,有水滴证明有水
13.3楼的答案很好了
14.量筒受热会影响测量准确度
1.小心点就行了
7.应该是左右移动吧
10.那算是什么问题?
12.在火焰上用一个干燥的烧杯罩着,有小液滴出现的则是水. 将气体通入澄清的石灰水,产生浑浊则是二氧化碳.
13.易燃,易挥发,有特殊香味,易溶于水
75%的酒精可用于消毒,制酒,还要很多工业用途
14.不可受热等
其它答案都可以了 ^-^
1不要让眼睛直接近距离对着液体
2先放平试管,把物体放在试管口处顺壁滑下
3防生锈 影响正确度
4不动下面那个游码没事 如果动了游码把读数记下减下就是实际的质量
5燃烧充分
6看不懂问题
7把使管倾斜45度放在酒精灯上上下移动
8防热
9 直接和间接
10什么实验?
11酒精喷灯==
12 CO2 用带火星的小木条 有液体产生就是水
13自己想
本人化学不是很好哦
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