Mentos and diet coke has become a well known science experiment as it is both interesting and fun.
The collision theory explains how chemical reactions happen and what factors effect the reaction rate.
Hot Ice a.k.a. sodium acetate is interesting because it can be super cooled and then releases heat when the freezing process is initiated.
The water cycle a.k.a. the hydrologic cycle is continues process that we witness countless times, maybe without realizing it.
Turn an egg into a rubber egg (naked egg) by submerging the egg in vinegar over night and in the process learn a bit about osmosis.
Ideas for your next magnet science project and a brief introduction to magnetism.
An egg in a bottle may not be very interesting, although the science behind how atmospheric pressure and a partial vacuum got the egg into the bottle in the first place is.
Red cabbage contains a naturally occurring pigment, anthocyanin. This pigment when in solution acts as a pH indicator similar to universal indicator.