Question

true—false t f

1. hot glass looks the same as cold glass. f
2. all chemicals in the lab are to be considered dangerous. t
3. return all unused chemicals to their original containers.
4. work areas should be kept clean and tidy. t
5. laboratory work can be started immediately upon entering the laboratory even if the instructor is not yet present.
6. never remove chemicals or other equipment from the laboratory.
7. chipped or cracked glassware is okay to use. f
8. read all procedures thoroughly before entering the laboratory.
9. all unauthorized experiments are prohibited.
10. you are allowed to enter the chemical preparation/storage area any time you need to get an item.
11. laboratory aprons should be worn during all lab activities.
12. it’s okay to pick up broken glass with your bare hands as long as the glass is placed in the trash. f

Explanation:

• 20. Hot glass can be hot - to - the - touch and may have different physical states or properties compared to cold glass, so it doesn't look the same. False.
• 21. Chemicals in a lab can be highly reactive, toxic etc., so all should be considered dangerous. True.
• 22. Returning unused chemicals to their original containers can contaminate the stock, so false.
• 23. Keeping work areas clean and tidy is a basic lab safety and organization rule. True.
• 24. Lab work should not start without the instructor present for safety and guidance. False.
• 25. Removing chemicals or equipment from the lab is a violation of lab rules. True.
• 26. Chipped or cracked glassware can break further and cause injury, so it's not okay to use. False.
• 27. Reading procedures thoroughly before entering the lab helps in safety and proper execution of experiments. True.
• 28. Unauthorized experiments can be dangerous and are prohibited. True.
• 29. Entering the chemical preparation/storage area without permission is not allowed. False.
• 30. Wearing aprons during lab activities protects clothing from chemical spills etc. True.
• 31. Picking up broken glass with bare hands can cause cuts, so false.

Answer:

1. F
2. T
3. F
4. T
5. F
6. T
7. F
8. T
9. T
10. F
11. T
12. F