Overview of the Investigation

• Incident occurred in the chemistry lab at Jefferson High School.

• Lieutenant Grumman and Sergeant Bruno investigate the accident.

• Grumman has experience in investigating accidents and suspects negligence.

Introduction to Chemistry Lab Safety

• The chemistry lab appears organized, with safety posters displayed.

• Mr. Petrie, the chemistry teacher, highlights the potential hazards of a chem lab:

  • Nitric Acid: Can cause severe burns.

  • Hydrochloric Acid: Breathing fumes can cause lung damage.

  • White Phosphorus and Sodium: Dangerous in improper handling.

Chemical Safety Practices

• Mr. Petrie demonstrates proper chemical storage:

  • Chemicals are properly labeled and stored.

  • Flammable liquids in secure cupboards.

  • Caustic chemicals are stored appropriately to minimize risk.

  • Incompatible chemicals kept separate.

General Lab Safety Rules

• Importance of being prepared before starting lab work:

  • Tying back long hair.

  • Rolling up sleeves to avoid hazards.

  • Avoiding dangling jewelry.

  • Wearing closed shoes; sandals should be avoided.

  • Using lab aprons for personal protection.

  • Wearing splash-proof goggles.

Practical Safety Demonstration

• Mr. Petrie performs a demonstration with a balloon containing chemicals:

  • One balloon with safety goggles vs. one without,

  • Demonstrates the importance of eye protection in case of an explosion.

Student Interviews and Safety Practices

• Interview with a student conducting a hydrogen preparation experiment:

  • Dilution of sulfuric acid explained:

    • Acid added to water, not vice versa, to prevent splashes.

  • Emphasizes checking labels of chemicals before use.

  • Proper cleaning protocols for spills and accidents:

    • Use sodium bicarbonate for acid spills;

    • Use vinegar Solution for base spills.

Handling Accidents and Emergency Protocols

• Discussion with other students highlights safety procedures:

  • Heating chemicals:

    • Keep test tube pointed away.

    • Move flame along the tube for even heating.

  • Fire extinguishing methods:

    • Do not use water on alcohol fires; instead use a fire extinguisher.

    • Fire blankets used for clothing fires.

Conclusion of Investigation

• Investigation does not reveal signs of negligence or improper practices.

• Accident in the lab remains a mystery.

• Clarification that they were in the wrong lab; not Jefferson High.

True or False Quiz Summary

• Spills should be cleaned immediately. (False)

• Chemicals should not be smelled directly. (False)

• Never drink from lab containers. (False)

• Safety goggles are essential. (True)

• Hair must be tied back for safety, not for style. (False)

• Lab aprons protect clothing and skin. (True)

• Dilution method: Acid into water. (True)

• Acid spills cleaned with base. (True)

• Strike match before turning on the burner. (True)

• Broken glass ends should be fire polished. (True)

• Know when glass is cool by looking. (False)

• Open test tube end pointed away during heating. (True)

• Do not use water for alcohol fires; use CO2 extinguisher. (False)