| Experiment 5.2 课本：pg54 （volume2） sodium hydroxide > for absorbing CO2 ?? wire gauze : separate the specimen and the sodium hydroxide. red ink = indicator Aim: to study oxygen used during respiration . 小强のtube : xq 呼吸需要oxygen,吸了oxygen 变少了, CO2 被棉花吸（因为有sodium hydroxide） 导致瓶子里的气压低。瓶外的气压高,把red ink move towards test tube. Test reaction : glowing wooden splinter extinguishes （灭） ??? no oxygen hypothesis : oxygen is used by living things during respiration |
The place where the fairytale begin ~
Experiment 5.2 课本：pg54 （volume2）
