http://www.abc.net.au/science/surfingscientist/
An arrangement of demos, lesson plans and videos spanning multiple science fields geared mostly to elementary students.
http://galileo.phys.virginia.edu/outreach/8thGradeSOL/home2.htm
Activities correlating to Virginia 8th Grade Physical Science SOLs
http://www.stevespanglerscience.com/experiments
A plethora of science experiments over a range of topics. The site also has science kits, supplies and gadgets for sale.
http://portal.acs.org/portal/PublicWebSite/volunteer/chemambassadors/futurechemists/CNBP_023888
ACS has come up with a guide to becoming a resource in the classroom, including planning classroom visits, how to discuss topics with children, and sample activities and demonstrations to do with students.
http://www.elmhurst.edu/~chm/demos/index.html
This site has a list of chemistry demonstrations, organized by household materials, and lab chemicals. Each one has directions and an explanation. Doesn’t appear to be updated since 2003.
This site has a group of experiments that can be done at home using household materials, descriptions of some common and interesting chemicals, and many additional resources.
When magnesium is ignited, it is readily oxidized by oxygen in the air producing an incredibly bright light and intense heat.
2Mg (s) + O2 (g) → 2MgO (s)
In this demo, baking soda and vinegar are mixed in a plastic storage bag. The reaction container is massed before and after the reaction for students to see the Law of Conservation of Mass in action.
NaHCO3 (s) + CH3COOH (aq) →CO2 (g) + H2O (l) + CH3COONa (aq)