A good 8th grade science experiment should center around use of the scientific method, particularly if the project will be graded or displayed at a science fair. A topic that interests the student can lead to a positive experiment experience.
A science experiment based on the scientific method begins with a purpose or question, a point at which personal interests can be explored. This is followed by research and the formation of a hypothesis. The experiment stage should be handled carefully as observations are made and data is recorded. This information will be analyzed so that a conclusion about the original hypothesis can be made.