Question

youve been injured in the lab. first, you should:
visit the school nurse after class
see a doctor after school
tell the science instructor immediately
apply first aid yourself

when gathering glassware and equipment for an experiment, you should:
read all directions carefully to know what equipment is necessary
examine all glassware to check for chips or cracks
clean any glassware that appears dirty
all of the above

you want to place a piece of glass tubing into a rubber stopper after the tubing has been fire polished and cooled. this is best done by:
lubricating the tube with water or glycerin
using a towel or cotton gloves for protection
twisting the tubing and stopper carefully
all of the above

Explanation:

1. For lab injuries, the instructor is trained to handle immediate lab safety responses, so notifying them first is critical.
2. When preparing lab equipment, reading directions ensures you get the right tools, checking glassware prevents hazards from damaged items, and cleaning dirty glassware avoids experiment contamination, so all steps are necessary.
3. Lubricating eases insertion, protective gear prevents cuts, and twisting carefully avoids breaking the glass, so all these steps are the correct safe procedure.

Answer:

1. tell the science instructor immediately
2. All of the above
3. all of the above