CHEM 101L EXAM FINAL QUESTIONS AND ANSWERS
When should you wear gloves in the laboratory setting?
They must be worn at all times when handling glassware and chemicals
When should you not wear gloves in the lab setting?
gloves must be removed before leaving the lab
gloves should be remov...
When should you wear gloves in the laboratory setting?
They must be worn at all times when handling glassware and chemicals
When should you not wear gloves in the lab setting?
gloves must be removed before leaving the lab
gloves should be removed when touching computer, or other personal items.
gloves should be removed when leaving lab
What should you do with loose/long hair/clothing?
tie back
securely constrained under a lab coat
What happens if you spill 0.1 M NaOH on skin and clothes?
skin contact can produce burns, so, we must (like most chemicals) rinse immediately at
the water faucets at the sink where the skin was exposed to corrosive materials. If you
are exposed to alot of it there is a shower at the fron of the room
Should you ever be allowed to eat inside the lab?
no
accuracy
the closeness of a measured value to a standard or known value
measuring the same quantity by different methods gives confidence in the nearness to
the "true" value
precision
reproducability
repetition of a measurement taken several times
experimental error can be classified as either?
systemic
OR
random
systemic error
can sometimes be corrected
example: a balance that is calibrated incorrectly and always reads 2.3g heavier than the
material being weighed
represent a limitation in the accuracy of a measurement
random error
arises from limitations in the ability to make physical measurements
equal chance of being positive or negative and is always present
, example:
uncertainty when reading a scale, and measurement between two marks must be
estimated to the best of the ability of the measurer but can never be perfect
this affects the precision, or reproducability of a measurement
When are you permitted to enter or work in a lab without TA permission
NEVER
Where do personal items go?
Not at the lab bench
personal items are placed in designated cabinets at the front of the classroom
Where can incident report forms be found?
inside first aid kits by the main hood
Shirts in lab must at least cover?
shoulders
back
abdominal area
Do not wear sleeveless shirts or tank tops
What should bottoms of clothing cover?
ankles
What kind of shoes should be worn in a lab setting?
close toed... covering entire foot (ballet flats are also unacceptable)
PPE
personal protective equipment
Any accidents in the lab, no matter how minor should be?
reported to the TA
When handling chemicals, what should we always use
hood ventilation
never keep an open beaker of solvent outside a hood
How should we transport chemicals?
closed containers
Do what you oughta, add
acid to wata
always add acid to water
NEVER add water to acids
Because of toxicity and flammability hazards, never dispose of solvents, toxic
substances, or reactive chemicals... where?
The drain
Chemicals must be disposed of in the liquid waste disposal located underneath the
ventilation hood at the front of the room
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