Your class will love this simple experiment. This outlines all of the steps of scientific investigation. The students have to come up with a question, make a hypothesis, conduct an experiment, show their results, and come up with a conclusion. Each step is clearly outlined and explained.
For my class, I just had to explain the process, give them a definition of a hypothesis (letting them know it's okay to be wrong!), and then explain why the salt and vinegar is the winner (sorry to give it awa