Question

all chemicals in the lab should be considered dangerous
true
false
pipets are used to measure and dispense small amounts of liquid. you should draw the liquid into the pipet using your mouth
true
false
laboratory work can be started immediately upon entering the lab, even if the instructor isnt present yet
true
false
chipped or cracked glassware is okay to use
true
false

Explanation:

1. For lab safety, all chemicals are treated as dangerous to prevent accidental exposure or harm, even if some seem non-toxic.
2. Using the mouth to draw liquid into a pipet risks ingesting hazardous substances; pipet bulbs or pumps are the safe alternative.
3. Starting lab work without an instructor present violates safety protocols, as guidance is needed for proper procedures and emergency response.
4. Chipped/cracked glassware can break further during use, causing cuts or contaminating samples, so it must be discarded.

Answer:

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