关于化学反应(急交作业!)

问题描述:

关于化学反应(急交作业!)
我们将两只削好两头的铅笔摆进水杯里,用电线将铅笔尖与九伏的正负电池系在一起.(一根铅笔系在电池正的那一头,一只系在负的那一头).然后会有一些泡泡在水里浮出来.
问题;
1/write a complete sentence what you observe ?
2/oxygen gas collects around the pencil attached to which terminal (+)or (-)?
3/hydrogen gas collects around the pencil attached to which terminal (+)or (-)?
4/which pencil (hydrogen or oxygen )has the most bubbles around it and why ?
5/write the chemical equation for reaction ?
帮忙解答一下,谢谢!

1:两支铅笔得一端都有无色无味得气体冒出,其中接负极得气体多 2:正极 3:负极 4:接负极得铅笔,根据化学反应方程式,产生hydrogen gas是oxygen gas 得2倍,见下一问得方程式 5:电解水 阴极:4H++4e-=2H2↑ 阳极:4OH...