This is cool I am gonna share a few links of some experiments my kids loved when they were in that age group.
http://www.rookieparenting.com/finding-iron-in-breakfast-cereal-science-experiment/
http://buggyandbuddy.com/science-for-kids-make-a-penny-turn-green/
http://thescientificmom.com/2013/12/the-twelve-days-of-science-day-5-egg.html
http://www.kidzworld.com/article/3844-making-invisible-ink-appear
I hope these help with some ideas. I have a ton of resources saved if you want any more links DM me on Steem.chat and I am happy to share more of the resources I have.
Also I would love to suggest using the educational tags on post like these for for exposure.
Thanks for your advice, will take a look at these articles for future reference