Final answer:
It is true that all lab chemicals must be considered dangerous, requiring strict adherence to safety protocols to prevent exposure to fumes, fires, and chemical mishaps. Handling and cleaning of all materials should be conducted with utmost care, and any incidents should be promptly reported to the teacher.
Step-by-step explanation:
The statement that all chemicals in the lab are to be considered dangerous is indeed true. Lab safety protocols dictate that various chemicals can pose different threats such as being flammable, toxic, or releasing harmful fumes when reacting or heated. It's critical to follow safety guidelines meticulously to prevent incidents such as chemical burns, inhalation of toxic fumes, fire hazards, or other accidents.
Never eat, drink, taste, or touch chemicals, and use equipment such as fume hoods to minimize exposure to fumes. Flammable materials should be kept away from any open flame or heat sources, and it's imperative to alert the teacher immediately if anything unusual occurs. Safety is the top priority, and being proactive with cleaning and handling of chemicals and equipment is essential.