Lab safety lesson - with rules/expectations

Designed to be a first lesson with a year 7 class. I ran through all expectations and the 'five Bs'. I printed out a small copy (4 per a4 page) of the five Bs for them to glue on the inside cover of their books. I demonstrated hydrogen balloons to get them engaged and interested then asked them to answer safety questions. I then introduced the science safety passport. Students worked through the points in the passport, ticking them off (as a circus of activities). Please rate & comment as appropriate.