1. Keep the sash down when the fume hood is not in use.
2. All flasks and beakers should be labelled.
3. Is a beaker the best option here? Particularly if heating? Should it clamped?
4. Spilled water or chemical should be immediately cleaned up.
5. Food or drink should not be consumed within a lab.
6. There should never be open bottles of chemicals on the bench, especially when they are a serious health hazard (see the CLP hazard pictograms).
7. Flask should be labelled, and if the chemicals in side are hazardous it should be kept in the fume hood.
8. TLC plates should not be cut up outside of the fume hood as silica dust can be hazardous if inhaled. If completing TLC on the bench, there must be a consideration of eluent hazards.
Note, Health and safety errors have been deliberately introduced into the scenarios for educational purposes. We do not condone bad lab practice, but allowing students to see such scenarios can help develop hazard perception skills. Best practice may differ in your institution, please discuss this with a local instructor.