Materials - bicard soda, vinegar and a little dishwashing liquid
This is a little experiment I was aware of but had never thought of doing with the kids. Being a wanabe ecomum I know that the fizzy bicarb and vinigar combo also works great for cleaning bathrooms, toilet and kitchens as well so perhaps next time the "science experiment" can take the form of cleaning the bathroom! Well I can always live in hope. Its just a shame my chemistry knowledge isn't so good because I was having a hard time explaining to junior why this raction takes place.
If anyone has any other good ideas or links to similar sites please let me know. I would like to continue the "science lessons" while Junior is still keen!