18. never remove chemicals or other equipment from the laboratory *\ntrue\nfalse\n19. chipped or cracked…

18. never remove chemicals or other equipment from the laboratory *\ntrue\nfalse\n19. chipped or cracked glassware is okay to use *\ntrue\nfalse\n20. read all procedures thoroughly before entering the laboratory *\ntrue\nfalse\n21. all unsupervised experiments are prohibited *\ntrue\nfalse

18. never remove chemicals or other equipment from the laboratory *\ntrue\nfalse\n19. chipped or cracked glassware is okay to use *\ntrue\nfalse\n20. read all procedures thoroughly before entering the laboratory *\ntrue\nfalse\n21. all unsupervised experiments are prohibited *\ntrue\nfalse

Answer

Brief Explanations:

  1. Removing chemicals or equipment from the lab is a safety - violation and can lead to hazards, so it's false to do so.
  2. Chipped or cracked glassware can break further and cause injuries, so it's not okay to use.
  3. Reading procedures thoroughly before entering the lab helps in safety and proper experiment execution.
  4. Unsupervised experiments can be dangerous and are generally prohibited.

Answer:

  1. True
  2. False
  3. True
  4. True