【简答题】Billy’s favorite color is orange. But he can’t see what orange looks like. Billy is blind. A month after he was born, his mother noticed that his eyes weren’t quite as big as a normal baby’s.”Billy wo...
【简答题】硫代硫酸钠(Na 2 S 2 O 3 )俗称保险粉,可用作定影剂,也可用于纸浆漂白、脱氯剂等。 Na 2 S 2 O 3 易溶于水,不溶于乙醇,常温下溶液中析出晶体通常为Na 2 S 2 O·5H 2 O。实验室制备保险粉的装置如下图所示。涉及的总化学方程式如下: (1)检查虚线框内装置气密性的方法是 。 (2)反应前仪器a中加入的药品为 ,仪器c中加入的药品为 。 (3)仪器b的名称是 。 (4...