This presentation is on lab safety and the purpose for performing labs. I use this during my introductory unit before we perform our first lab/activity of the school year.
Students review everything from not entering the classroom/lab if unsupervised to fire safety equipment. The final slide of the presentation is a great way to get student input on safety in the lab. I simply as each group (my students are always arranged in groups of six) to come up with 5 additional safety rules.
Fun pictures, quick explanations, all encompassing.