sudan IV, oil and water
Curriculum Connection: High-school Biology
I was preparing Sudan IV for a nutrient lab for grade 11 SBI3C biology. In order to use the chemical as an indicator for fats and oils, I needed to mix the Sudan IV powder with ethanol. I followed proper safety precautions (gloves, goggles, fume hood). Somehow, a small amount of the Sudan IV powder got on my hand. I promptly washed my hands with soap and water, and checked the MSDS which advised me to flush the exposed area with water. After flushing, my hand appeared to be clean. Continue reading
Prevent Tragic Accidents with Flammable Liquids
Girl in Flames Runs from School Lab Explosion! Lab Accident Sends Teacher and Students to
Hospital! Teacher Charged After Experiment Goes Awry! Continue reading
Demonstrations are an effective teaching tool. Even though students may not be handling chemicals or using equipment during a demonstration, it is vitally important that instructors follow rigorous safety rules. Continue reading
While serious accidents causing catastrophic injury in high school science activities are rare, when they occur their human toll can be devastating. This post examines one potentially dangerous demo, its hazards and suggestions for safer alternatives.
The Rainbow Flame Demonstration:
Several of the most serious science accidents have resulted from the combustion of flammable liquids in teacher demonstrations like the rainbow flame demonstration. In this demo, metals salts are heated in a ceramic dish containing burning methanol. The flame colour observed is characteristic of the metal. Click on this link for an example of how this demo is sometimes done. Please note that the procedure used in this video, in our opinion, is unsafe, inappropriate for students of any age and NOT recommended for teachers.
Methanol vapours are extremely flammable. Furthermore, since the density of methanol is greater than that or air, methanol vapour can flow invisibly across surfaces like the demonstration desk and onto the floor towards unsuspecting observers. A flame, spark or even a hot surface can supply sufficient energy to ignite the vapour and create a sudden flash fire. The situation can be even more catastrophic if a nearby open container of methanol is present.
The Safer (and Better) Way:
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Accidents involving electricity can cause shock, burns, and even death. Reviewing and following a few basic rules will help you improve electrical safety when working with hot plates, electrophoresis equipment, power supplies, Van de Graaff generators, etc. Continue reading
Autoclave, Bleach or Biohazard Bag?
Biology, microbiology and biochemistry labs may generate wastes that must be managed as potentially infectious, biohazardous or regulated medical waste. Continue reading
There’s nothing like the fresh smell of a real tree, but real trees can also pose a serious fire hazard if the tree accidentally dries out. Steve Spangler shares a “television-only” science demonstration with firefighters in a controlled situation that illustrates how dry trees are susceptible to catching fire and ways to avoid this potential fire risk. Continue reading