1.使用托盘天平:先调零、再称量。2.加热:先擦干外壁、再加热;先预热、再集中加热。3.固体与液体混合:先加入固体,再加入液体。4.点燃可燃性气体:先检验纯度,再点燃。5.制取气体:先检查装置的气密性、再装药品。6.固固加热制O2排水法收集结束时:先将导管移出水面,再熄灭酒精灯。7.稀释浓硫酸:先往烧杯里加水,再沿烧杯壁慢慢注入浓硫酸,并不断搅拌,待冷却后再装瓶。8.固气反应炼铜、炼铁:实验开始时,先通气,再点...
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