Posted by christina on .
I need help with a a school science test held tommorrow. Its about chemical equations and I was wondering if someone can explain to me how to add ions and valencies when adding chemical equations?
Any help would be greatly appreciated

Science 
SraJMcGin,
Thank you for using the Jiskha Homework Help Forum. I hope the rule for valencies will assist you:
http://www.jgp.org/cgi/content/abstract/6/5/547